diff --git a/homeassistant/__main__.py b/homeassistant/__main__.py
index 8ec2a8c2d3c..8765ee6c822 100644
--- a/homeassistant/__main__.py
+++ b/homeassistant/__main__.py
@@ -168,7 +168,7 @@ def get_arguments() -> argparse.Namespace:
     parser.add_argument(
         "--runner",
         action="store_true",
-        help="On restart exit with code {}".format(RESTART_EXIT_CODE),
+        help=f"On restart exit with code {RESTART_EXIT_CODE}",
     )
     parser.add_argument(
         "--script", nargs=argparse.REMAINDER, help="Run one of the embedded scripts"
@@ -240,7 +240,7 @@ def write_pid(pid_file: str) -> None:
         with open(pid_file, "w") as file:
             file.write(str(pid))
     except IOError:
-        print("Fatal Error: Unable to write pid file {}".format(pid_file))
+        print(f"Fatal Error: Unable to write pid file {pid_file}")
         sys.exit(1)
 
 
@@ -326,7 +326,7 @@ def try_to_restart() -> None:
             thread.is_alive() and not thread.daemon for thread in threading.enumerate()
         )
         if nthreads > 1:
-            sys.stderr.write("Found {} non-daemonic threads.\n".format(nthreads))
+            sys.stderr.write(f"Found {nthreads} non-daemonic threads.\n")
 
     # Somehow we sometimes seem to trigger an assertion in the python threading
     # module. It seems we find threads that have no associated OS level thread
diff --git a/homeassistant/auth/__init__.py b/homeassistant/auth/__init__.py
index 2641f0b8f7e..e2778e9f45b 100644
--- a/homeassistant/auth/__init__.py
+++ b/homeassistant/auth/__init__.py
@@ -278,9 +278,7 @@ class AuthManager:
 
         module = self.get_auth_mfa_module(mfa_module_id)
         if module is None:
-            raise ValueError(
-                "Unable find multi-factor auth module: {}".format(mfa_module_id)
-            )
+            raise ValueError(f"Unable find multi-factor auth module: {mfa_module_id}")
 
         await module.async_setup_user(user.id, data)
 
@@ -295,9 +293,7 @@ class AuthManager:
 
         module = self.get_auth_mfa_module(mfa_module_id)
         if module is None:
-            raise ValueError(
-                "Unable find multi-factor auth module: {}".format(mfa_module_id)
-            )
+            raise ValueError(f"Unable find multi-factor auth module: {mfa_module_id}")
 
         await module.async_depose_user(user.id)
 
@@ -356,7 +352,7 @@ class AuthManager:
                 ):
                     # Each client_name can only have one
                     # long_lived_access_token type of refresh token
-                    raise ValueError("{} already exists".format(client_name))
+                    raise ValueError(f"{client_name} already exists")
 
         return await self._store.async_create_refresh_token(
             user,
diff --git a/homeassistant/auth/auth_store.py b/homeassistant/auth/auth_store.py
index 82db0bcf7a9..894819fb3c7 100644
--- a/homeassistant/auth/auth_store.py
+++ b/homeassistant/auth/auth_store.py
@@ -94,7 +94,7 @@ class AuthStore:
         for group_id in group_ids or []:
             group = self._groups.get(group_id)
             if group is None:
-                raise ValueError("Invalid group specified {}".format(group_id))
+                raise ValueError(f"Invalid group specified {group_id}")
             groups.append(group)
 
         kwargs = {
diff --git a/homeassistant/auth/mfa_modules/__init__.py b/homeassistant/auth/mfa_modules/__init__.py
index 5481b8fe08b..baccedeabbf 100644
--- a/homeassistant/auth/mfa_modules/__init__.py
+++ b/homeassistant/auth/mfa_modules/__init__.py
@@ -144,15 +144,13 @@ async def auth_mfa_module_from_config(
 
 async def _load_mfa_module(hass: HomeAssistant, module_name: str) -> types.ModuleType:
     """Load an mfa auth module."""
-    module_path = "homeassistant.auth.mfa_modules.{}".format(module_name)
+    module_path = f"homeassistant.auth.mfa_modules.{module_name}"
 
     try:
         module = importlib.import_module(module_path)
     except ImportError as err:
         _LOGGER.error("Unable to load mfa module %s: %s", module_name, err)
-        raise HomeAssistantError(
-            "Unable to load mfa module {}: {}".format(module_name, err)
-        )
+        raise HomeAssistantError(f"Unable to load mfa module {module_name}: {err}")
 
     if hass.config.skip_pip or not hasattr(module, "REQUIREMENTS"):
         return module
diff --git a/homeassistant/auth/providers/__init__.py b/homeassistant/auth/providers/__init__.py
index c35af2e0b96..ee9ef8f94cd 100644
--- a/homeassistant/auth/providers/__init__.py
+++ b/homeassistant/auth/providers/__init__.py
@@ -144,14 +144,10 @@ async def load_auth_provider_module(
 ) -> types.ModuleType:
     """Load an auth provider."""
     try:
-        module = importlib.import_module(
-            "homeassistant.auth.providers.{}".format(provider)
-        )
+        module = importlib.import_module(f"homeassistant.auth.providers.{provider}")
     except ImportError as err:
         _LOGGER.error("Unable to load auth provider %s: %s", provider, err)
-        raise HomeAssistantError(
-            "Unable to load auth provider {}: {}".format(provider, err)
-        )
+        raise HomeAssistantError(f"Unable to load auth provider {provider}: {err}")
 
     if hass.config.skip_pip or not hasattr(module, "REQUIREMENTS"):
         return module
@@ -166,7 +162,7 @@ async def load_auth_provider_module(
     # https://github.com/python/mypy/issues/1424
     reqs = module.REQUIREMENTS  # type: ignore
     await requirements.async_process_requirements(
-        hass, "auth provider {}".format(provider), reqs
+        hass, f"auth provider {provider}", reqs
     )
 
     processed.add(provider)
diff --git a/homeassistant/bootstrap.py b/homeassistant/bootstrap.py
index b0eab0da0f3..3e71a588af0 100644
--- a/homeassistant/bootstrap.py
+++ b/homeassistant/bootstrap.py
@@ -163,7 +163,7 @@ def async_enable_logging(
             # ensure that the handlers it sets up wraps the correct streams.
             logging.basicConfig(level=logging.INFO)
 
-            colorfmt = "%(log_color)s{}%(reset)s".format(fmt)
+            colorfmt = f"%(log_color)s{fmt}%(reset)s"
             logging.getLogger().handlers[0].setFormatter(
                 ColoredFormatter(
                     colorfmt,
diff --git a/homeassistant/components/api/__init__.py b/homeassistant/components/api/__init__.py
index ee991535104..d4faa55ed8c 100644
--- a/homeassistant/components/api/__init__.py
+++ b/homeassistant/components/api/__init__.py
@@ -138,7 +138,7 @@ class APIEventStream(HomeAssistantView):
                     if payload is stop_obj:
                         break
 
-                    msg = "data: {}\n\n".format(payload)
+                    msg = f"data: {payload}\n\n"
                     _LOGGER.debug("STREAM %s WRITING %s", id(stop_obj), msg.strip())
                     await response.write(msg.encode("UTF-8"))
                 except asyncio.TimeoutError:
@@ -316,7 +316,7 @@ class APIEventView(HomeAssistantView):
             event_type, event_data, ha.EventOrigin.remote, self.context(request)
         )
 
-        return self.json_message("Event {} fired.".format(event_type))
+        return self.json_message(f"Event {event_type} fired.")
 
 
 class APIServicesView(HomeAssistantView):
@@ -388,7 +388,7 @@ class APITemplateView(HomeAssistantView):
             return tpl.async_render(data.get("variables"))
         except (ValueError, TemplateError) as ex:
             return self.json_message(
-                "Error rendering template: {}".format(ex), HTTP_BAD_REQUEST
+                f"Error rendering template: {ex}", HTTP_BAD_REQUEST
             )
 
 
diff --git a/homeassistant/components/automation/__init__.py b/homeassistant/components/automation/__init__.py
index 5de9336d1d9..1cffd361b19 100644
--- a/homeassistant/components/automation/__init__.py
+++ b/homeassistant/components/automation/__init__.py
@@ -143,7 +143,7 @@ async def async_setup(hass, config):
     async def turn_onoff_service_handler(service_call):
         """Handle automation turn on/off service calls."""
         tasks = []
-        method = "async_{}".format(service_call.service)
+        method = f"async_{service_call.service}"
         for entity in await component.async_extract_from_service(service_call):
             tasks.append(getattr(entity, method)())
 
@@ -378,7 +378,7 @@ async def _async_process_config(hass, config, component):
 
         for list_no, config_block in enumerate(conf):
             automation_id = config_block.get(CONF_ID)
-            name = config_block.get(CONF_ALIAS) or "{} {}".format(config_key, list_no)
+            name = config_block.get(CONF_ALIAS) or f"{config_key} {list_no}"
 
             hidden = config_block[CONF_HIDE_ENTITY]
             initial_state = config_block.get(CONF_INITIAL_STATE)
@@ -431,7 +431,7 @@ def _async_get_action(hass, config, name):
             await script_obj.async_run(variables, context)
         except Exception as err:  # pylint: disable=broad-except
             script_obj.async_log_exception(
-                _LOGGER, "Error while executing automation {}".format(entity_id), err
+                _LOGGER, f"Error while executing automation {entity_id}", err
             )
 
     return action
diff --git a/homeassistant/components/config/__init__.py b/homeassistant/components/config/__init__.py
index 5de11a032c5..6d4b465fceb 100644
--- a/homeassistant/components/config/__init__.py
+++ b/homeassistant/components/config/__init__.py
@@ -36,7 +36,7 @@ async def async_setup(hass, config):
 
     async def setup_panel(panel_name):
         """Set up a panel."""
-        panel = importlib.import_module(".{}".format(panel_name), __name__)
+        panel = importlib.import_module(f".{panel_name}", __name__)
 
         if not panel:
             return
@@ -44,7 +44,7 @@ async def async_setup(hass, config):
         success = await panel.async_setup(hass)
 
         if success:
-            key = "{}.{}".format(DOMAIN, panel_name)
+            key = f"{DOMAIN}.{panel_name}"
             hass.bus.async_fire(EVENT_COMPONENT_LOADED, {ATTR_COMPONENT: key})
 
     @callback
@@ -82,8 +82,8 @@ class BaseEditConfigView(HomeAssistantView):
         post_write_hook=None,
     ):
         """Initialize a config view."""
-        self.url = "/api/config/%s/%s/{config_key}" % (component, config_type)
-        self.name = "api:config:%s:%s" % (component, config_type)
+        self.url = f"/api/config/{component}/{config_type}/{{config_key}}"
+        self.name = f"api:config:{component}:{config_type}"
         self.path = path
         self.key_schema = key_schema
         self.data_schema = data_schema
@@ -126,14 +126,14 @@ class BaseEditConfigView(HomeAssistantView):
         try:
             self.key_schema(config_key)
         except vol.Invalid as err:
-            return self.json_message("Key malformed: {}".format(err), 400)
+            return self.json_message(f"Key malformed: {err}", 400)
 
         try:
             # We just validate, we don't store that data because
             # we don't want to store the defaults.
             self.data_schema(data)
         except vol.Invalid as err:
-            return self.json_message("Message malformed: {}".format(err), 400)
+            return self.json_message(f"Message malformed: {err}", 400)
 
         hass = request.app["hass"]
         path = hass.config.path(self.path)
diff --git a/homeassistant/components/configurator/__init__.py b/homeassistant/components/configurator/__init__.py
index 99995959c23..f3b2a41e917 100644
--- a/homeassistant/components/configurator/__init__.py
+++ b/homeassistant/components/configurator/__init__.py
@@ -61,10 +61,10 @@ def async_request_config(
     Will return an ID to be used for sequent calls.
     """
     if link_name is not None and link_url is not None:
-        description += "\n\n[{}]({})".format(link_name, link_url)
+        description += f"\n\n[{link_name}]({link_url})"
 
     if description_image is not None:
-        description += "\n\n![Description image]({})".format(description_image)
+        description += f"\n\n![Description image]({description_image})"
 
     instance = hass.data.get(_KEY_INSTANCE)
 
diff --git a/homeassistant/components/demo/camera.py b/homeassistant/components/demo/camera.py
index 7ac5fc17c69..0cd77b6112e 100644
--- a/homeassistant/components/demo/camera.py
+++ b/homeassistant/components/demo/camera.py
@@ -28,7 +28,7 @@ class DemoCamera(Camera):
         self._images_index = (self._images_index + 1) % 4
 
         image_path = os.path.join(
-            os.path.dirname(__file__), "demo_{}.jpg".format(self._images_index)
+            os.path.dirname(__file__), f"demo_{self._images_index}.jpg"
         )
         _LOGGER.debug("Loading camera_image: %s", image_path)
         with open(image_path, "rb") as file:
diff --git a/homeassistant/components/demo/media_player.py b/homeassistant/components/demo/media_player.py
index e3f69be3020..fb64f8015c0 100644
--- a/homeassistant/components/demo/media_player.py
+++ b/homeassistant/components/demo/media_player.py
@@ -417,7 +417,7 @@ class DemoTVShowPlayer(AbstractDemoPlayer):
     @property
     def media_title(self):
         """Return the title of current playing media."""
-        return "Chapter {}".format(self._cur_episode)
+        return f"Chapter {self._cur_episode}"
 
     @property
     def media_series_title(self):
diff --git a/homeassistant/components/demo/vacuum.py b/homeassistant/components/demo/vacuum.py
index ffd3e768b11..2ba704d3925 100644
--- a/homeassistant/components/demo/vacuum.py
+++ b/homeassistant/components/demo/vacuum.py
@@ -244,7 +244,7 @@ class DemoVacuum(VacuumDevice):
         if self.supported_features & SUPPORT_SEND_COMMAND == 0:
             return
 
-        self._status = "Executing {}({})".format(command, params)
+        self._status = f"Executing {command}({params})"
         self._state = True
         self.schedule_update_ha_state()
 
diff --git a/homeassistant/components/frontend/__init__.py b/homeassistant/components/frontend/__init__.py
index d8790b746be..7298ce8c1d0 100644
--- a/homeassistant/components/frontend/__init__.py
+++ b/homeassistant/components/frontend/__init__.py
@@ -274,9 +274,7 @@ async def async_setup(hass, config):
         ("frontend_latest", True),
         ("frontend_es5", True),
     ):
-        hass.http.register_static_path(
-            "/{}".format(path), str(root_path / path), should_cache
-        )
+        hass.http.register_static_path(f"/{path}", str(root_path / path), should_cache)
 
     hass.http.register_static_path(
         "/auth/authorize", str(root_path / "authorize.html"), False
@@ -294,9 +292,7 @@ async def async_setup(hass, config):
     # To smooth transition to new urls, add redirects to new urls of dev tools
     # Added June 27, 2019. Can be removed in 2021.
     for panel in ("event", "info", "service", "state", "template", "mqtt"):
-        hass.http.register_redirect(
-            "/dev-{}".format(panel), "/developer-tools/{}".format(panel)
-        )
+        hass.http.register_redirect(f"/dev-{panel}", f"/developer-tools/{panel}")
 
     async_register_built_in_panel(
         hass,
diff --git a/homeassistant/components/hassio/__init__.py b/homeassistant/components/hassio/__init__.py
index 801c20b5c2b..6603728e037 100644
--- a/homeassistant/components/hassio/__init__.py
+++ b/homeassistant/components/hassio/__init__.py
@@ -271,7 +271,7 @@ async def async_setup(hass, config):
             hass.components.persistent_notification.async_create(
                 "Config error. See dev-info panel for details.",
                 "Config validating",
-                "{0}.check_config".format(HASS_DOMAIN),
+                f"{HASS_DOMAIN}.check_config",
             )
             return
 
diff --git a/homeassistant/components/hassio/handler.py b/homeassistant/components/hassio/handler.py
index 10f21556fb3..5213443614c 100644
--- a/homeassistant/components/hassio/handler.py
+++ b/homeassistant/components/hassio/handler.py
@@ -80,7 +80,7 @@ class HassIO:
 
         This method return a coroutine.
         """
-        return self.send_command("/addons/{}/info".format(addon), method="get")
+        return self.send_command(f"/addons/{addon}/info", method="get")
 
     @_api_data
     def get_ingress_panels(self):
@@ -120,7 +120,7 @@ class HassIO:
 
         This method return a coroutine.
         """
-        return self.send_command("/discovery/{}".format(uuid), method="get")
+        return self.send_command(f"/discovery/{uuid}", method="get")
 
     @_api_bool
     async def update_hass_api(self, http_config, refresh_token):
@@ -156,7 +156,7 @@ class HassIO:
             with async_timeout.timeout(timeout):
                 request = await self.websession.request(
                     method,
-                    "http://{}{}".format(self._ip, command),
+                    f"http://{self._ip}{command}",
                     json=payload,
                     headers={X_HASSIO: os.environ.get("HASSIO_TOKEN", "")},
                 )
diff --git a/homeassistant/components/hassio/http.py b/homeassistant/components/hassio/http.py
index f42aaca4438..3b1b8374510 100644
--- a/homeassistant/components/hassio/http.py
+++ b/homeassistant/components/hassio/http.py
@@ -75,7 +75,7 @@ class HassIOView(HomeAssistantView):
 
             method = getattr(self._websession, request.method.lower())
             client = await method(
-                "http://{}/{}".format(self._host, path),
+                f"http://{self._host}/{path}",
                 data=data,
                 headers=headers,
                 timeout=read_timeout,
diff --git a/homeassistant/components/hassio/ingress.py b/homeassistant/components/hassio/ingress.py
index 84e2b096362..4ecb9a8419f 100644
--- a/homeassistant/components/hassio/ingress.py
+++ b/homeassistant/components/hassio/ingress.py
@@ -42,7 +42,7 @@ class HassIOIngress(HomeAssistantView):
 
     def _create_url(self, token: str, path: str) -> str:
         """Create URL to service."""
-        return "http://{}/ingress/{}/{}".format(self._host, token, path)
+        return f"http://{self._host}/ingress/{token}/{path}"
 
     async def _handle(
         self, request: web.Request, token: str, path: str
@@ -91,7 +91,7 @@ class HassIOIngress(HomeAssistantView):
 
         # Support GET query
         if request.query_string:
-            url = "{}?{}".format(url, request.query_string)
+            url = f"{url}?{request.query_string}"
 
         # Start proxy
         async with self._websession.ws_connect(
@@ -175,15 +175,15 @@ def _init_header(
     headers[X_HASSIO] = os.environ.get("HASSIO_TOKEN", "")
 
     # Ingress information
-    headers[X_INGRESS_PATH] = "/api/hassio_ingress/{}".format(token)
+    headers[X_INGRESS_PATH] = f"/api/hassio_ingress/{token}"
 
     # Set X-Forwarded-For
     forward_for = request.headers.get(hdrs.X_FORWARDED_FOR)
     connected_ip = ip_address(request.transport.get_extra_info("peername")[0])
     if forward_for:
-        forward_for = "{}, {!s}".format(forward_for, connected_ip)
+        forward_for = f"{forward_for}, {connected_ip!s}"
     else:
-        forward_for = "{!s}".format(connected_ip)
+        forward_for = f"{connected_ip!s}"
     headers[hdrs.X_FORWARDED_FOR] = forward_for
 
     # Set X-Forwarded-Host
diff --git a/homeassistant/components/http/__init__.py b/homeassistant/components/http/__init__.py
index 5e474dafa07..a8aaa3390a7 100644
--- a/homeassistant/components/http/__init__.py
+++ b/homeassistant/components/http/__init__.py
@@ -133,12 +133,12 @@ class ApiConfig:
         if host.startswith(("http://", "https://")):
             self.base_url = host
         elif use_ssl:
-            self.base_url = "https://{}".format(host)
+            self.base_url = f"https://{host}"
         else:
-            self.base_url = "http://{}".format(host)
+            self.base_url = f"http://{host}"
 
         if port is not None:
-            self.base_url += ":{}".format(port)
+            self.base_url += f":{port}"
 
 
 async def async_setup(hass, config):
@@ -268,15 +268,11 @@ class HomeAssistantHTTP:
 
         if not hasattr(view, "url"):
             class_name = view.__class__.__name__
-            raise AttributeError(
-                '{0} missing required attribute "url"'.format(class_name)
-            )
+            raise AttributeError(f'{class_name} missing required attribute "url"')
 
         if not hasattr(view, "name"):
             class_name = view.__class__.__name__
-            raise AttributeError(
-                '{0} missing required attribute "name"'.format(class_name)
-            )
+            raise AttributeError(f'{class_name} missing required attribute "name"')
 
         view.register(self.app, self.app.router)
 
diff --git a/homeassistant/components/http/ban.py b/homeassistant/components/http/ban.py
index 71e7ff38924..d8fa8853c7f 100644
--- a/homeassistant/components/http/ban.py
+++ b/homeassistant/components/http/ban.py
@@ -127,7 +127,7 @@ async def process_wrong_login(request):
         _LOGGER.warning("Banned IP %s for too many login attempts", remote_addr)
 
         hass.components.persistent_notification.async_create(
-            "Too many login attempts from {}".format(remote_addr),
+            f"Too many login attempts from {remote_addr}",
             "Banning IP address",
             NOTIFICATION_ID_BAN,
         )
diff --git a/homeassistant/components/http/data_validator.py b/homeassistant/components/http/data_validator.py
index 634a96aa312..5945a4ca402 100644
--- a/homeassistant/components/http/data_validator.py
+++ b/homeassistant/components/http/data_validator.py
@@ -43,9 +43,7 @@ class RequestDataValidator:
                 kwargs["data"] = self._schema(data)
             except vol.Invalid as err:
                 _LOGGER.error("Data does not match schema: %s", err)
-                return view.json_message(
-                    "Message format incorrect: {}".format(err), 400
-                )
+                return view.json_message(f"Message format incorrect: {err}", 400)
 
             result = await method(view, request, *args, **kwargs)
             return result
diff --git a/homeassistant/components/http/static.py b/homeassistant/components/http/static.py
index 76844407f7d..952ca473fdc 100644
--- a/homeassistant/components/http/static.py
+++ b/homeassistant/components/http/static.py
@@ -10,7 +10,7 @@ from aiohttp.web_urldispatcher import StaticResource
 # mypy: allow-untyped-defs
 
 CACHE_TIME = 31 * 86400  # = 1 month
-CACHE_HEADERS = {hdrs.CACHE_CONTROL: "public, max-age={}".format(CACHE_TIME)}
+CACHE_HEADERS = {hdrs.CACHE_CONTROL: f"public, max-age={CACHE_TIME}"}
 
 
 # https://github.com/PyCQA/astroid/issues/633
diff --git a/homeassistant/components/input_number/__init__.py b/homeassistant/components/input_number/__init__.py
index 2564b8b31b4..007ed6517ef 100644
--- a/homeassistant/components/input_number/__init__.py
+++ b/homeassistant/components/input_number/__init__.py
@@ -49,13 +49,11 @@ def _cv_input_number(cfg):
     maximum = cfg.get(CONF_MAX)
     if minimum >= maximum:
         raise vol.Invalid(
-            "Maximum ({}) is not greater than minimum ({})".format(minimum, maximum)
+            f"Maximum ({minimum}) is not greater than minimum ({maximum})"
         )
     state = cfg.get(CONF_INITIAL)
     if state is not None and (state < minimum or state > maximum):
-        raise vol.Invalid(
-            "Initial value {} not in range {}-{}".format(state, minimum, maximum)
-        )
+        raise vol.Invalid(f"Initial value {state} not in range {minimum}-{maximum}")
     return cfg
 
 
diff --git a/homeassistant/components/input_text/__init__.py b/homeassistant/components/input_text/__init__.py
index 2b7c7312f71..fc49bd65ced 100644
--- a/homeassistant/components/input_text/__init__.py
+++ b/homeassistant/components/input_text/__init__.py
@@ -45,12 +45,12 @@ def _cv_input_text(cfg):
     maximum = cfg.get(CONF_MAX)
     if minimum > maximum:
         raise vol.Invalid(
-            "Max len ({}) is not greater than min len ({})".format(minimum, maximum)
+            f"Max len ({minimum}) is not greater than min len ({maximum})"
         )
     state = cfg.get(CONF_INITIAL)
     if state is not None and (len(state) < minimum or len(state) > maximum):
         raise vol.Invalid(
-            "Initial value {} length not in range {}-{}".format(state, minimum, maximum)
+            f"Initial value {state} length not in range {minimum}-{maximum}"
         )
     return cfg
 
diff --git a/homeassistant/components/integration/sensor.py b/homeassistant/components/integration/sensor.py
index d24b70c4be0..236a996794a 100644
--- a/homeassistant/components/integration/sensor.py
+++ b/homeassistant/components/integration/sensor.py
@@ -94,7 +94,7 @@ class IntegrationSensor(RestoreEntity):
         self._state = 0
         self._method = integration_method
 
-        self._name = name if name is not None else "{} integral".format(source_entity)
+        self._name = name if name is not None else f"{source_entity} integral"
 
         if unit_of_measurement is None:
             self._unit_template = "{}{}{}".format(
diff --git a/homeassistant/components/intent_script/__init__.py b/homeassistant/components/intent_script/__init__.py
index 443a4cbc854..75a0c0e8f97 100644
--- a/homeassistant/components/intent_script/__init__.py
+++ b/homeassistant/components/intent_script/__init__.py
@@ -55,7 +55,7 @@ async def async_setup(hass, config):
     for intent_type, conf in intents.items():
         if CONF_ACTION in conf:
             conf[CONF_ACTION] = script.Script(
-                hass, conf[CONF_ACTION], "Intent Script {}".format(intent_type)
+                hass, conf[CONF_ACTION], f"Intent Script {intent_type}"
             )
         intent.async_register(hass, ScriptIntentHandler(intent_type, conf))
 
diff --git a/homeassistant/components/python_script/__init__.py b/homeassistant/components/python_script/__init__.py
index 715c06aca43..af0865bc685 100644
--- a/homeassistant/components/python_script/__init__.py
+++ b/homeassistant/components/python_script/__init__.py
@@ -113,7 +113,7 @@ def discover_scripts(hass):
 @bind_hass
 def execute_script(hass, name, data=None):
     """Execute a script."""
-    filename = "{}.py".format(name)
+    filename = f"{name}.py"
     with open(hass.config.path(FOLDER, sanitize_filename(filename))) as fil:
         source = fil.read()
     execute(hass, filename, source, data)
@@ -166,9 +166,7 @@ def execute(hass, filename, source, data=None):
             or isinstance(obj, TimeWrapper)
             and name not in ALLOWED_TIME
         ):
-            raise ScriptError(
-                "Not allowed to access {}.{}".format(obj.__class__.__name__, name)
-            )
+            raise ScriptError(f"Not allowed to access {obj.__class__.__name__}.{name}")
 
         return getattr(obj, name, default)
 
@@ -188,7 +186,7 @@ def execute(hass, filename, source, data=None):
         "_iter_unpack_sequence_": guarded_iter_unpack_sequence,
         "_unpack_sequence_": guarded_unpack_sequence,
     }
-    logger = logging.getLogger("{}.{}".format(__name__, filename))
+    logger = logging.getLogger(f"{__name__}.{filename}")
     local = {"hass": hass, "data": data or {}, "logger": logger}
 
     try:
diff --git a/homeassistant/components/recorder/migration.py b/homeassistant/components/recorder/migration.py
index aee993fa104..3de0430d8f3 100644
--- a/homeassistant/components/recorder/migration.py
+++ b/homeassistant/components/recorder/migration.py
@@ -107,7 +107,7 @@ def _drop_index(engine, table_name, index_name):
 
     # Engines like DB2/Oracle
     try:
-        engine.execute(text("DROP INDEX {index}".format(index=index_name)))
+        engine.execute(text(f"DROP INDEX {index_name}"))
     except SQLAlchemyError:
         pass
     else:
@@ -170,7 +170,7 @@ def _add_columns(engine, table_name, columns_def):
         table_name,
     )
 
-    columns_def = ["ADD {}".format(col_def) for col_def in columns_def]
+    columns_def = [f"ADD {col_def}" for col_def in columns_def]
 
     try:
         engine.execute(
@@ -265,9 +265,7 @@ def _apply_update(engine, new_version, old_version):
         #     'context_parent_id CHARACTER(36)',
         # ])
     else:
-        raise ValueError(
-            "No schema migration defined for version {}".format(new_version)
-        )
+        raise ValueError(f"No schema migration defined for version {new_version}")
 
 
 def _inspect_schema_version(engine, session):
diff --git a/homeassistant/components/script/__init__.py b/homeassistant/components/script/__init__.py
index d810d50cfbf..5a3223a8508 100644
--- a/homeassistant/components/script/__init__.py
+++ b/homeassistant/components/script/__init__.py
@@ -209,7 +209,7 @@ class ScriptEntity(ToggleEntity):
             await self.script.async_run(kwargs.get(ATTR_VARIABLES), context)
         except Exception as err:  # pylint: disable=broad-except
             self.script.async_log_exception(
-                _LOGGER, "Error executing script {}".format(self.entity_id), err
+                _LOGGER, f"Error executing script {self.entity_id}", err
             )
             raise err
 
diff --git a/homeassistant/components/system_log/__init__.py b/homeassistant/components/system_log/__init__.py
index c9bd486053e..68561d45f8f 100644
--- a/homeassistant/components/system_log/__init__.py
+++ b/homeassistant/components/system_log/__init__.py
@@ -198,7 +198,7 @@ async def async_setup(hass, config):
             return
         if service.service == "write":
             logger = logging.getLogger(
-                service.data.get(CONF_LOGGER, "{}.external".format(__name__))
+                service.data.get(CONF_LOGGER, f"{__name__}.external")
             )
             level = service.data[CONF_LEVEL]
             getattr(logger, level)(service.data[CONF_MESSAGE])
diff --git a/homeassistant/components/tts/__init__.py b/homeassistant/components/tts/__init__.py
index 77d24fd7aab..3e7900502d6 100644
--- a/homeassistant/components/tts/__init__.py
+++ b/homeassistant/components/tts/__init__.py
@@ -165,9 +165,7 @@ async def async_setup(hass, config):
                 DOMAIN_MP, SERVICE_PLAY_MEDIA, data, blocking=True
             )
 
-        service_name = p_config.get(
-            CONF_SERVICE_NAME, "{}_{}".format(p_type, SERVICE_SAY)
-        )
+        service_name = p_config.get(CONF_SERVICE_NAME, f"{p_type}_{SERVICE_SAY}")
         hass.services.async_register(
             DOMAIN, service_name, async_say_handle, schema=SCHEMA_SERVICE_SAY
         )
@@ -229,7 +227,7 @@ class SpeechManager:
                 init_tts_cache_dir, cache_dir
             )
         except OSError as err:
-            raise HomeAssistantError("Can't init cache dir {}".format(err))
+            raise HomeAssistantError(f"Can't init cache dir {err}")
 
         def get_cache_files():
             """Return a dict of given engine files."""
@@ -251,7 +249,7 @@ class SpeechManager:
         try:
             cache_files = await self.hass.async_add_job(get_cache_files)
         except OSError as err:
-            raise HomeAssistantError("Can't read cache dir {}".format(err))
+            raise HomeAssistantError(f"Can't read cache dir {err}")
 
         if cache_files:
             self.file_cache.update(cache_files)
@@ -293,7 +291,7 @@ class SpeechManager:
         # Languages
         language = language or provider.default_language
         if language is None or language not in provider.supported_languages:
-            raise HomeAssistantError("Not supported language {0}".format(language))
+            raise HomeAssistantError(f"Not supported language {language}")
 
         # Options
         if provider.default_options and options:
@@ -308,9 +306,7 @@ class SpeechManager:
                 if opt_name not in (provider.supported_options or [])
             ]
             if invalid_opts:
-                raise HomeAssistantError(
-                    "Invalid options found: {}".format(invalid_opts)
-                )
+                raise HomeAssistantError(f"Invalid options found: {invalid_opts}")
             options_key = ctypes.c_size_t(hash(frozenset(options))).value
         else:
             options_key = "-"
@@ -330,7 +326,7 @@ class SpeechManager:
                 engine, key, message, use_cache, language, options
             )
 
-        return "{}/api/tts_proxy/{}".format(self.base_url, filename)
+        return f"{self.base_url}/api/tts_proxy/{filename}"
 
     async def async_get_tts_audio(self, engine, key, message, cache, language, options):
         """Receive TTS and store for view in cache.
@@ -341,10 +337,10 @@ class SpeechManager:
         extension, data = await provider.async_get_tts_audio(message, language, options)
 
         if data is None or extension is None:
-            raise HomeAssistantError("No TTS from {} for '{}'".format(engine, message))
+            raise HomeAssistantError(f"No TTS from {engine} for '{message}'")
 
         # Create file infos
-        filename = ("{}.{}".format(key, extension)).lower()
+        filename = (f"{key}.{extension}").lower()
 
         data = self.write_tags(filename, data, provider, message, language, options)
 
@@ -381,7 +377,7 @@ class SpeechManager:
         """
         filename = self.file_cache.get(key)
         if not filename:
-            raise HomeAssistantError("Key {} not in file cache!".format(key))
+            raise HomeAssistantError(f"Key {key} not in file cache!")
 
         voice_file = os.path.join(self.cache_dir, filename)
 
@@ -394,7 +390,7 @@ class SpeechManager:
             data = await self.hass.async_add_job(load_speech)
         except OSError:
             del self.file_cache[key]
-            raise HomeAssistantError("Can't read {}".format(voice_file))
+            raise HomeAssistantError(f"Can't read {voice_file}")
 
         self._async_store_to_memcache(key, filename, data)
 
@@ -425,7 +421,7 @@ class SpeechManager:
 
         if key not in self.mem_cache:
             if key not in self.file_cache:
-                raise HomeAssistantError("{} not in cache!".format(key))
+                raise HomeAssistantError(f"{key} not in cache!")
             await self.async_file_to_mem(key)
 
         content, _ = mimetypes.guess_type(filename)
diff --git a/homeassistant/components/utility_meter/__init__.py b/homeassistant/components/utility_meter/__init__.py
index c09c43dc282..17eacc326d3 100644
--- a/homeassistant/components/utility_meter/__init__.py
+++ b/homeassistant/components/utility_meter/__init__.py
@@ -98,7 +98,7 @@ async def async_setup(hass, config):
                 tariff_confs.append(
                     {
                         CONF_METER: meter,
-                        CONF_NAME: "{} {}".format(meter, tariff),
+                        CONF_NAME: f"{meter} {tariff}",
                         CONF_TARIFF: tariff,
                     }
                 )
diff --git a/homeassistant/components/utility_meter/sensor.py b/homeassistant/components/utility_meter/sensor.py
index 1eceaea2ae5..1ad4300b28b 100644
--- a/homeassistant/components/utility_meter/sensor.py
+++ b/homeassistant/components/utility_meter/sensor.py
@@ -107,7 +107,7 @@ class UtilityMeterSensor(RestoreEntity):
         if name:
             self._name = name
         else:
-            self._name = "{} meter".format(source_entity)
+            self._name = f"{source_entity} meter"
         self._unit_of_measurement = None
         self._period = meter_type
         self._period_offset = meter_offset
diff --git a/homeassistant/components/zeroconf/__init__.py b/homeassistant/components/zeroconf/__init__.py
index 2ed03b73eff..af107a6ae0d 100644
--- a/homeassistant/components/zeroconf/__init__.py
+++ b/homeassistant/components/zeroconf/__init__.py
@@ -33,7 +33,7 @@ CONFIG_SCHEMA = vol.Schema({DOMAIN: vol.Schema({})}, extra=vol.ALLOW_EXTRA)
 
 def setup(hass, config):
     """Set up Zeroconf and make Home Assistant discoverable."""
-    zeroconf_name = "{}.{}".format(hass.config.location_name, ZEROCONF_TYPE)
+    zeroconf_name = f"{hass.config.location_name}.{ZEROCONF_TYPE}"
 
     params = {
         "version": __version__,
diff --git a/homeassistant/config.py b/homeassistant/config.py
index 1f42b3db25e..f4775e71805 100644
--- a/homeassistant/config.py
+++ b/homeassistant/config.py
@@ -317,7 +317,7 @@ async def async_hass_config_yaml(hass: HomeAssistant) -> Dict:
         path = find_config_file(hass.config.config_dir)
         if path is None:
             raise HomeAssistantError(
-                "Config file not found in: {}".format(hass.config.config_dir)
+                f"Config file not found in: {hass.config.config_dir}"
             )
         config = load_yaml_config_file(path)
         return config
@@ -443,7 +443,7 @@ def _format_config_error(ex: vol.Invalid, domain: str, config: Dict) -> str:
 
     This method must be run in the event loop.
     """
-    message = "Invalid config for [{}]: ".format(domain)
+    message = f"Invalid config for [{domain}]: "
     if "extra keys not allowed" in ex.error_message:
         message += (
             "[{option}] is an invalid option for [{domain}]. "
@@ -705,7 +705,7 @@ async def merge_packages_config(
             error = _recursive_merge(conf=config[comp_name], package=comp_conf)
             if error:
                 _log_pkg_error(
-                    pack_name, comp_name, config, "has duplicate key '{}'".format(error)
+                    pack_name, comp_name, config, f"has duplicate key '{error}'"
                 )
 
     return config
@@ -777,7 +777,7 @@ async def async_process_component_config(
                     p_config
                 )
             except vol.Invalid as ex:
-                async_log_exception(ex, "{}.{}".format(domain, p_name), p_config, hass)
+                async_log_exception(ex, f"{domain}.{p_name}", p_config, hass)
                 continue
 
         platforms.append(p_validated)
@@ -836,7 +836,7 @@ def async_notify_setup_error(
         else:
             part = name
 
-        message += " - {}\n".format(part)
+        message += f" - {part}\n"
 
     message += "\nPlease check your config."
 
diff --git a/homeassistant/core.py b/homeassistant/core.py
index e8e33a0479e..4d7596d667b 100644
--- a/homeassistant/core.py
+++ b/homeassistant/core.py
@@ -1365,7 +1365,7 @@ class Config:
             self.time_zone = time_zone
             dt_util.set_default_time_zone(time_zone)
         else:
-            raise ValueError("Received invalid time zone {}".format(time_zone_str))
+            raise ValueError(f"Received invalid time zone {time_zone_str}")
 
     @callback
     def _update(
diff --git a/homeassistant/data_entry_flow.py b/homeassistant/data_entry_flow.py
index 0af6677dceb..6bbd757fca6 100644
--- a/homeassistant/data_entry_flow.py
+++ b/homeassistant/data_entry_flow.py
@@ -126,7 +126,7 @@ class FlowManager:
         self, flow: Any, step_id: str, user_input: Optional[Dict]
     ) -> Dict:
         """Handle a step of a flow."""
-        method = "async_step_{}".format(step_id)
+        method = f"async_step_{step_id}"
 
         if not hasattr(flow, method):
             self._progress.pop(flow.flow_id)
diff --git a/homeassistant/exceptions.py b/homeassistant/exceptions.py
index dfb001ff0d7..89caf730ad7 100644
--- a/homeassistant/exceptions.py
+++ b/homeassistant/exceptions.py
@@ -25,7 +25,7 @@ class TemplateError(HomeAssistantError):
 
     def __init__(self, exception: jinja2.TemplateError) -> None:
         """Init the error."""
-        super().__init__("{}: {}".format(exception.__class__.__name__, exception))
+        super().__init__(f"{exception.__class__.__name__}: {exception}")
 
 
 class PlatformNotReady(HomeAssistantError):
@@ -73,10 +73,10 @@ class ServiceNotFound(HomeAssistantError):
 
     def __init__(self, domain: str, service: str) -> None:
         """Initialize error."""
-        super().__init__(self, "Service {}.{} not found".format(domain, service))
+        super().__init__(self, f"Service {domain}.{service} not found")
         self.domain = domain
         self.service = service
 
     def __str__(self) -> str:
         """Return string representation."""
-        return "Unable to find service {}/{}".format(self.domain, self.service)
+        return f"Unable to find service {self.domain}/{self.service}"
diff --git a/homeassistant/helpers/check_config.py b/homeassistant/helpers/check_config.py
index bc39d5d5720..f49ae976827 100644
--- a/homeassistant/helpers/check_config.py
+++ b/homeassistant/helpers/check_config.py
@@ -62,7 +62,7 @@ async def async_check_ha_config_file(hass: HomeAssistant) -> HomeAssistantConfig
         message = "Package {} setup failed. Component {} {}".format(
             package, component, message
         )
-        domain = "homeassistant.packages.{}.{}".format(package, component)
+        domain = f"homeassistant.packages.{package}.{component}"
         pack_config = core_config[CONF_PACKAGES].get(package, config)
         result.add_error(message, domain, pack_config)
 
@@ -77,9 +77,9 @@ async def async_check_ha_config_file(hass: HomeAssistant) -> HomeAssistantConfig
             return result.add_error("File configuration.yaml not found.")
         config = await hass.async_add_executor_job(load_yaml_config_file, config_path)
     except FileNotFoundError:
-        return result.add_error("File not found: {}".format(config_path))
+        return result.add_error(f"File not found: {config_path}")
     except HomeAssistantError as err:
-        return result.add_error("Error loading {}: {}".format(config_path, err))
+        return result.add_error(f"Error loading {config_path}: {err}")
     finally:
         yaml_loader.clear_secret_cache()
 
@@ -106,13 +106,13 @@ async def async_check_ha_config_file(hass: HomeAssistant) -> HomeAssistantConfig
         try:
             integration = await async_get_integration_with_requirements(hass, domain)
         except (RequirementsNotFound, loader.IntegrationNotFound) as ex:
-            result.add_error("Component error: {} - {}".format(domain, ex))
+            result.add_error(f"Component error: {domain} - {ex}")
             continue
 
         try:
             component = integration.get_component()
         except ImportError as ex:
-            result.add_error("Component error: {} - {}".format(domain, ex))
+            result.add_error(f"Component error: {domain} - {ex}")
             continue
 
         config_schema = getattr(component, "CONFIG_SCHEMA", None)
@@ -159,7 +159,7 @@ async def async_check_ha_config_file(hass: HomeAssistant) -> HomeAssistantConfig
                 RequirementsNotFound,
                 ImportError,
             ) as ex:
-                result.add_error("Platform error {}.{} - {}".format(domain, p_name, ex))
+                result.add_error(f"Platform error {domain}.{p_name} - {ex}")
                 continue
 
             # Validate platform specific schema
@@ -168,7 +168,7 @@ async def async_check_ha_config_file(hass: HomeAssistant) -> HomeAssistantConfig
                 try:
                     p_validated = platform_schema(p_validated)
                 except vol.Invalid as ex:
-                    _comp_error(ex, "{}.{}".format(domain, p_name), p_validated)
+                    _comp_error(ex, f"{domain}.{p_name}", p_validated)
                     continue
 
             platforms.append(p_validated)
diff --git a/homeassistant/helpers/entity.py b/homeassistant/helpers/entity.py
index bd96e1bafdb..dc2e46cc6b2 100644
--- a/homeassistant/helpers/entity.py
+++ b/homeassistant/helpers/entity.py
@@ -243,11 +243,11 @@ class Entity:
         This method must be run in the event loop.
         """
         if self.hass is None:
-            raise RuntimeError("Attribute hass is None for {}".format(self))
+            raise RuntimeError(f"Attribute hass is None for {self}")
 
         if self.entity_id is None:
             raise NoEntitySpecifiedError(
-                "No entity id specified for entity {}".format(self.name)
+                f"No entity id specified for entity {self.name}"
             )
 
         # update entity data
@@ -264,11 +264,11 @@ class Entity:
     def async_write_ha_state(self):
         """Write the state to the state machine."""
         if self.hass is None:
-            raise RuntimeError("Attribute hass is None for {}".format(self))
+            raise RuntimeError(f"Attribute hass is None for {self}")
 
         if self.entity_id is None:
             raise NoEntitySpecifiedError(
-                "No entity id specified for entity {}".format(self.name)
+                f"No entity id specified for entity {self.name}"
             )
 
         self._async_write_ha_state()
diff --git a/homeassistant/helpers/entity_component.py b/homeassistant/helpers/entity_component.py
index b28beeaea72..a9237635702 100644
--- a/homeassistant/helpers/entity_component.py
+++ b/homeassistant/helpers/entity_component.py
@@ -205,7 +205,7 @@ class EntityComponent:
 
         async def handle_service(call):
             """Handle the service."""
-            service_name = "{}.{}".format(self.domain, name)
+            service_name = f"{self.domain}.{name}"
             await self.hass.helpers.service.entity_service_call(
                 self._platforms.values(), func, call, service_name, required_features
             )
diff --git a/homeassistant/helpers/entity_platform.py b/homeassistant/helpers/entity_platform.py
index 4a6a3038fd0..7d5debd484d 100644
--- a/homeassistant/helpers/entity_platform.py
+++ b/homeassistant/helpers/entity_platform.py
@@ -133,7 +133,7 @@ class EntityPlatform:
         current_platform.set(self)
         logger = self.logger
         hass = self.hass
-        full_name = "{}.{}".format(self.domain, self.platform_name)
+        full_name = f"{self.domain}.{self.platform_name}"
 
         logger.info("Setting up %s", full_name)
         warn_task = hass.loop.call_later(
@@ -357,7 +357,7 @@ class EntityPlatform:
                     "Not adding entity %s because it's disabled",
                     entry.name
                     or entity.name
-                    or '"{} {}"'.format(self.platform_name, entity.unique_id),
+                    or f'"{self.platform_name} {entity.unique_id}"',
                 )
                 return
 
@@ -386,12 +386,12 @@ class EntityPlatform:
 
         # Make sure it is valid in case an entity set the value themselves
         if not valid_entity_id(entity.entity_id):
-            raise HomeAssistantError("Invalid entity id: {}".format(entity.entity_id))
+            raise HomeAssistantError(f"Invalid entity id: {entity.entity_id}")
         if (
             entity.entity_id in self.entities
             or entity.entity_id in self.hass.states.async_entity_ids(self.domain)
         ):
-            msg = "Entity id already exists: {}".format(entity.entity_id)
+            msg = f"Entity id already exists: {entity.entity_id}"
             if entity.unique_id is not None:
                 msg += ". Platform {} does not generate unique IDs".format(
                     self.platform_name
diff --git a/homeassistant/helpers/entity_registry.py b/homeassistant/helpers/entity_registry.py
index 7d81f62fa1c..3be00c859a7 100644
--- a/homeassistant/helpers/entity_registry.py
+++ b/homeassistant/helpers/entity_registry.py
@@ -166,9 +166,7 @@ class EntityRegistry:
             )
 
         entity_id = self.async_generate_entity_id(
-            domain,
-            suggested_object_id or "{}_{}".format(platform, unique_id),
-            known_object_ids,
+            domain, suggested_object_id or f"{platform}_{unique_id}", known_object_ids
         )
 
         if (
diff --git a/homeassistant/helpers/intent.py b/homeassistant/helpers/intent.py
index ffd5918810f..4fb0d94287c 100644
--- a/homeassistant/helpers/intent.py
+++ b/homeassistant/helpers/intent.py
@@ -58,7 +58,7 @@ async def async_handle(
     handler = hass.data.get(DATA_KEY, {}).get(intent_type)  # type: IntentHandler
 
     if handler is None:
-        raise UnknownIntent("Unknown intent {}".format(intent_type))
+        raise UnknownIntent(f"Unknown intent {intent_type}")
 
     intent = Intent(hass, platform, intent_type, slots or {}, text_input)
 
@@ -68,13 +68,11 @@ async def async_handle(
         return result
     except vol.Invalid as err:
         _LOGGER.warning("Received invalid slot info for %s: %s", intent_type, err)
-        raise InvalidSlotInfo(
-            "Received invalid slot info for {}".format(intent_type)
-        ) from err
+        raise InvalidSlotInfo(f"Received invalid slot info for {intent_type}") from err
     except IntentHandleError:
         raise
     except Exception as err:
-        raise IntentUnexpectedError("Error handling {}".format(intent_type)) from err
+        raise IntentUnexpectedError(f"Error handling {intent_type}") from err
 
 
 class IntentError(HomeAssistantError):
@@ -109,7 +107,7 @@ def async_match_state(
     state = _fuzzymatch(name, states, lambda state: state.name)
 
     if state is None:
-        raise IntentHandleError("Unable to find an entity called {}".format(name))
+        raise IntentHandleError(f"Unable to find an entity called {name}")
 
     return state
 
@@ -118,9 +116,7 @@ def async_match_state(
 def async_test_feature(state: State, feature: int, feature_name: str) -> None:
     """Test is state supports a feature."""
     if state.attributes.get(ATTR_SUPPORTED_FEATURES, 0) & feature == 0:
-        raise IntentHandleError(
-            "Entity {} does not support {}".format(state.name, feature_name)
-        )
+        raise IntentHandleError(f"Entity {state.name} does not support {feature_name}")
 
 
 class IntentHandler:
diff --git a/homeassistant/helpers/temperature.py b/homeassistant/helpers/temperature.py
index 8b32b1355fa..30b428a9e17 100644
--- a/homeassistant/helpers/temperature.py
+++ b/homeassistant/helpers/temperature.py
@@ -20,7 +20,7 @@ def display_temp(
     # If the temperature is not a number this can cause issues
     # with Polymer components, so bail early there.
     if not isinstance(temperature, Number):
-        raise TypeError("Temperature is not a number: {}".format(temperature))
+        raise TypeError(f"Temperature is not a number: {temperature}")
 
     # type ignore: https://github.com/python/mypy/issues/7207
     if temperature_unit != ha_unit:  # type: ignore
diff --git a/homeassistant/helpers/template.py b/homeassistant/helpers/template.py
index ca320cb1c33..98e3849bfb6 100644
--- a/homeassistant/helpers/template.py
+++ b/homeassistant/helpers/template.py
@@ -320,10 +320,10 @@ class AllStates:
         """Return the domain state."""
         if "." in name:
             if not valid_entity_id(name):
-                raise TemplateError("Invalid entity ID '{}'".format(name))
+                raise TemplateError(f"Invalid entity ID '{name}'")
             return _get_state(self._hass, name)
         if not valid_entity_id(name + ".entity"):
-            raise TemplateError("Invalid domain name '{}'".format(name))
+            raise TemplateError(f"Invalid domain name '{name}'")
         return DomainStates(self._hass, name)
 
     def _collect_all(self):
@@ -367,9 +367,9 @@ class DomainStates:
 
     def __getattr__(self, name):
         """Return the states."""
-        entity_id = "{}.{}".format(self._domain, name)
+        entity_id = f"{self._domain}.{name}"
         if not valid_entity_id(entity_id):
-            raise TemplateError("Invalid entity ID '{}'".format(entity_id))
+            raise TemplateError(f"Invalid entity ID '{entity_id}'")
         return _get_state(self._hass, entity_id)
 
     def _collect_domain(self):
@@ -399,7 +399,7 @@ class DomainStates:
 
     def __repr__(self):
         """Representation of Domain States."""
-        return "<template DomainStates('{}')>".format(self._domain)
+        return f"<template DomainStates('{self._domain}')>"
 
 
 class TemplateState(State):
@@ -426,7 +426,7 @@ class TemplateState(State):
         unit = state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
         if unit is None:
             return state.state
-        return "{} {}".format(state.state, unit)
+        return f"{state.state} {unit}"
 
     def __getattribute__(self, name):
         """Return an attribute of the state."""
diff --git a/homeassistant/helpers/translation.py b/homeassistant/helpers/translation.py
index 78c1ddb463a..531695c64da 100644
--- a/homeassistant/helpers/translation.py
+++ b/homeassistant/helpers/translation.py
@@ -20,9 +20,9 @@ def recursive_flatten(prefix: Any, data: Dict) -> Dict[str, Any]:
     output = {}
     for key, value in data.items():
         if isinstance(value, dict):
-            output.update(recursive_flatten("{}{}.".format(prefix, key), value))
+            output.update(recursive_flatten(f"{prefix}{key}.", value))
         else:
-            output["{}{}".format(prefix, key)] = value
+            output[f"{prefix}{key}"] = value
     return output
 
 
@@ -60,7 +60,7 @@ async def component_translation_file(
     if integration.file_path.name != domain:
         return None
 
-    filename = "{}.json".format(language)
+    filename = f"{language}.json"
     return str(integration.file_path / ".translations" / filename)
 
 
diff --git a/homeassistant/loader.py b/homeassistant/loader.py
index ba92c0e609f..f7c59ab0bf0 100644
--- a/homeassistant/loader.py
+++ b/homeassistant/loader.py
@@ -165,10 +165,7 @@ class Integration:
                 continue
 
             return cls(
-                hass,
-                "{}.{}".format(root_module.__name__, domain),
-                manifest_path.parent,
-                manifest,
+                hass, f"{root_module.__name__}.{domain}", manifest_path.parent, manifest
             )
 
         return None
@@ -229,16 +226,16 @@ class Integration:
     def get_platform(self, platform_name: str) -> ModuleType:
         """Return a platform for an integration."""
         cache = self.hass.data.setdefault(DATA_COMPONENTS, {})
-        full_name = "{}.{}".format(self.domain, platform_name)
+        full_name = f"{self.domain}.{platform_name}"
         if full_name not in cache:
             cache[full_name] = importlib.import_module(
-                "{}.{}".format(self.pkg_path, platform_name)
+                f"{self.pkg_path}.{platform_name}"
             )
         return cache[full_name]  # type: ignore
 
     def __repr__(self) -> str:
         """Text representation of class."""
-        return "<Integration {}: {}>".format(self.domain, self.pkg_path)
+        return f"<Integration {self.domain}: {self.pkg_path}>"
 
 
 async def async_get_integration(hass: "HomeAssistant", domain: str) -> Integration:
@@ -312,7 +309,7 @@ class IntegrationNotFound(LoaderError):
 
     def __init__(self, domain: str) -> None:
         """Initialize a component not found error."""
-        super().__init__("Integration {} not found.".format(domain))
+        super().__init__(f"Integration {domain} not found.")
         self.domain = domain
 
 
@@ -321,9 +318,7 @@ class CircularDependency(LoaderError):
 
     def __init__(self, from_domain: str, to_domain: str) -> None:
         """Initialize circular dependency error."""
-        super().__init__(
-            "Circular dependency detected: {} -> {}.".format(from_domain, to_domain)
-        )
+        super().__init__(f"Circular dependency detected: {from_domain} -> {to_domain}.")
         self.from_domain = from_domain
         self.to_domain = to_domain
 
@@ -350,7 +345,7 @@ def _load_file(
             return None
         cache = hass.data[DATA_COMPONENTS] = {}
 
-    for path in ("{}.{}".format(base, comp_or_platform) for base in base_paths):
+    for path in (f"{base}.{comp_or_platform}" for base in base_paths):
         try:
             module = importlib.import_module(path)
 
@@ -439,7 +434,7 @@ class Components:
             component = _load_file(self._hass, comp_name, LOOKUP_PATHS)
 
         if component is None:
-            raise ImportError("Unable to load {}".format(comp_name))
+            raise ImportError(f"Unable to load {comp_name}")
 
         wrapped = ModuleWrapper(self._hass, component)
         setattr(self, comp_name, wrapped)
@@ -457,7 +452,7 @@ class Helpers:
 
     def __getattr__(self, helper_name: str) -> ModuleWrapper:
         """Fetch a helper."""
-        helper = importlib.import_module("homeassistant.helpers.{}".format(helper_name))
+        helper = importlib.import_module(f"homeassistant.helpers.{helper_name}")
         wrapped = ModuleWrapper(self._hass, helper)
         setattr(self, helper_name, wrapped)
         return wrapped
diff --git a/homeassistant/requirements.py b/homeassistant/requirements.py
index bdc7798e4f8..95738084f1f 100644
--- a/homeassistant/requirements.py
+++ b/homeassistant/requirements.py
@@ -22,9 +22,7 @@ class RequirementsNotFound(HomeAssistantError):
 
     def __init__(self, domain: str, requirements: List) -> None:
         """Initialize a component not found error."""
-        super().__init__(
-            "Requirements for {} not found: {}.".format(domain, requirements)
-        )
+        super().__init__(f"Requirements for {domain} not found: {requirements}.")
         self.domain = domain
         self.requirements = requirements
 
diff --git a/homeassistant/scripts/benchmark/__init__.py b/homeassistant/scripts/benchmark/__init__.py
index 0b9cb8fd362..6bfac497677 100644
--- a/homeassistant/scripts/benchmark/__init__.py
+++ b/homeassistant/scripts/benchmark/__init__.py
@@ -39,7 +39,7 @@ def run(args):
             hass = core.HomeAssistant(loop)
             hass.async_stop_track_tasks()
             runtime = loop.run_until_complete(bench(hass))
-            print("Benchmark {} done in {}s".format(bench.__name__, runtime))
+            print(f"Benchmark {bench.__name__} done in {runtime}s")
             loop.run_until_complete(hass.async_stop())
             loop.close()
 
diff --git a/homeassistant/scripts/credstash.py b/homeassistant/scripts/credstash.py
index 2341ea20021..e77ae326cd7 100644
--- a/homeassistant/scripts/credstash.py
+++ b/homeassistant/scripts/credstash.py
@@ -58,20 +58,18 @@ def run(args):
         if args.value:
             the_secret = args.value
         else:
-            the_secret = getpass.getpass(
-                "Please enter the secret for {}: ".format(args.name)
-            )
+            the_secret = getpass.getpass(f"Please enter the secret for {args.name}: ")
         current_version = credstash.getHighestVersion(args.name, table=table)
         credstash.putSecret(
             args.name, the_secret, version=int(current_version) + 1, table=table
         )
-        print("Secret {} put successfully".format(args.name))
+        print(f"Secret {args.name} put successfully")
     elif args.action == "get":
         the_secret = credstash.getSecret(args.name, table=table)
         if the_secret is None:
-            print("Secret {} not found".format(args.name))
+            print(f"Secret {args.name} not found")
         else:
-            print("Secret {}={}".format(args.name, the_secret))
+            print(f"Secret {args.name}={the_secret}")
     elif args.action == "del":
         credstash.deleteSecrets(args.name, table=table)
-        print("Deleted secret {}".format(args.name))
+        print(f"Deleted secret {args.name}")
diff --git a/homeassistant/scripts/keyring.py b/homeassistant/scripts/keyring.py
index 77c0aaef681..6ca422b595b 100644
--- a/homeassistant/scripts/keyring.py
+++ b/homeassistant/scripts/keyring.py
@@ -36,29 +36,27 @@ def run(args):
     if args.action == "info":
         keyr = keyring.get_keyring()
         print("Keyring version {}\n".format(REQUIREMENTS[0].split("==")[1]))
-        print("Active keyring  : {}".format(keyr.__module__))
+        print(f"Active keyring  : {keyr.__module__}")
         config_name = os.path.join(platform.config_root(), "keyringrc.cfg")
-        print("Config location : {}".format(config_name))
+        print(f"Config location : {config_name}")
         print("Data location   : {}\n".format(platform.data_root()))
     elif args.name is None:
         parser.print_help()
         return 1
 
     if args.action == "set":
-        entered_secret = getpass.getpass(
-            "Please enter the secret for {}: ".format(args.name)
-        )
+        entered_secret = getpass.getpass(f"Please enter the secret for {args.name}: ")
         keyring.set_password(_SECRET_NAMESPACE, args.name, entered_secret)
-        print("Secret {} set successfully".format(args.name))
+        print(f"Secret {args.name} set successfully")
     elif args.action == "get":
         the_secret = keyring.get_password(_SECRET_NAMESPACE, args.name)
         if the_secret is None:
-            print("Secret {} not found".format(args.name))
+            print(f"Secret {args.name} not found")
         else:
-            print("Secret {}={}".format(args.name, the_secret))
+            print(f"Secret {args.name}={the_secret}")
     elif args.action == "del":
         try:
             keyring.delete_password(_SECRET_NAMESPACE, args.name)
-            print("Deleted secret {}".format(args.name))
+            print(f"Deleted secret {args.name}")
         except keyring.errors.PasswordDeleteError:
-            print("Secret {} not found".format(args.name))
+            print(f"Secret {args.name} not found")
diff --git a/homeassistant/setup.py b/homeassistant/setup.py
index 78bcb2e6505..58e4fc19eb0 100644
--- a/homeassistant/setup.py
+++ b/homeassistant/setup.py
@@ -240,7 +240,7 @@ async def async_prepare_setup_platform(
     try:
         platform = integration.get_platform(domain)
     except ImportError as exc:
-        log_error("Platform not found ({}).".format(exc))
+        log_error(f"Platform not found ({exc}).")
         return None
 
     # Already loaded
@@ -253,7 +253,7 @@ async def async_prepare_setup_platform(
         try:
             component = integration.get_component()
         except ImportError as exc:
-            log_error("Unable to import the component ({}).".format(exc))
+            log_error(f"Unable to import the component ({exc}).")
             return None
 
         if hasattr(component, "setup") or hasattr(component, "async_setup"):
diff --git a/homeassistant/util/__init__.py b/homeassistant/util/__init__.py
index 08c3a51e247..0f4f3c867ad 100644
--- a/homeassistant/util/__init__.py
+++ b/homeassistant/util/__init__.py
@@ -86,7 +86,7 @@ def ensure_unique_string(
 
     while test_string in current_strings_set:
         tries += 1
-        test_string = "{}_{}".format(preferred_string, tries)
+        test_string = f"{preferred_string}_{tries}"
 
     return test_string
 
diff --git a/homeassistant/util/distance.py b/homeassistant/util/distance.py
index 329b62bb304..b9cce45cb5b 100644
--- a/homeassistant/util/distance.py
+++ b/homeassistant/util/distance.py
@@ -25,7 +25,7 @@ def convert(value: float, unit_1: str, unit_2: str) -> float:
         raise ValueError(UNIT_NOT_RECOGNIZED_TEMPLATE.format(unit_2, LENGTH))
 
     if not isinstance(value, Number):
-        raise TypeError("{} is not of numeric type".format(value))
+        raise TypeError(f"{value} is not of numeric type")
 
     # type ignore: https://github.com/python/mypy/issues/7207
     if unit_1 == unit_2 or unit_1 not in VALID_UNITS:  # type: ignore
diff --git a/homeassistant/util/dt.py b/homeassistant/util/dt.py
index 359387974f3..9a456e6f400 100644
--- a/homeassistant/util/dt.py
+++ b/homeassistant/util/dt.py
@@ -193,8 +193,8 @@ def get_age(date: dt.datetime) -> str:
     def formatn(number: int, unit: str) -> str:
         """Add "unit" if it's plural."""
         if number == 1:
-            return "1 {}".format(unit)
-        return "{:d} {}s".format(number, unit)
+            return f"1 {unit}"
+        return f"{number:d} {unit}s"
 
     def q_n_r(first: int, second: int) -> Tuple[int, int]:
         """Return quotient and remaining."""
diff --git a/homeassistant/util/pressure.py b/homeassistant/util/pressure.py
index 82879ff4dc8..e394076800c 100644
--- a/homeassistant/util/pressure.py
+++ b/homeassistant/util/pressure.py
@@ -34,7 +34,7 @@ def convert(value: float, unit_1: str, unit_2: str) -> float:
         raise ValueError(UNIT_NOT_RECOGNIZED_TEMPLATE.format(unit_2, PRESSURE))
 
     if not isinstance(value, Number):
-        raise TypeError("{} is not of numeric type".format(value))
+        raise TypeError(f"{value} is not of numeric type")
 
     # type ignore: https://github.com/python/mypy/issues/7207
     if unit_1 == unit_2 or unit_1 not in VALID_UNITS:  # type: ignore
diff --git a/homeassistant/util/volume.py b/homeassistant/util/volume.py
index ede92cb1004..5a05b663522 100644
--- a/homeassistant/util/volume.py
+++ b/homeassistant/util/volume.py
@@ -34,7 +34,7 @@ def convert(volume: float, from_unit: str, to_unit: str) -> float:
         raise ValueError(UNIT_NOT_RECOGNIZED_TEMPLATE.format(to_unit, VOLUME))
 
     if not isinstance(volume, Number):
-        raise TypeError("{} is not of numeric type".format(volume))
+        raise TypeError(f"{volume} is not of numeric type")
 
     # type ignore: https://github.com/python/mypy/issues/7207
     if from_unit == to_unit:  # type: ignore
diff --git a/homeassistant/util/yaml/loader.py b/homeassistant/util/yaml/loader.py
index eda3f12905d..f7e44178acb 100644
--- a/homeassistant/util/yaml/loader.py
+++ b/homeassistant/util/yaml/loader.py
@@ -207,7 +207,7 @@ def _ordered_dict(loader: SafeLineLoader, node: yaml.nodes.MappingNode) -> Order
         except TypeError:
             fname = getattr(loader.stream, "name", "")
             raise yaml.MarkedYAMLError(
-                context='invalid key: "{}"'.format(key),
+                context=f'invalid key: "{key}"',
                 context_mark=yaml.Mark(fname, 0, line, -1, None, None),
             )
 
@@ -314,7 +314,7 @@ def secret_yaml(loader: SafeLineLoader, node: yaml.nodes.Node) -> JSON_TYPE:
             # Catch if package installed and no config
             credstash = None
 
-    raise HomeAssistantError("Secret {} not defined".format(node.value))
+    raise HomeAssistantError(f"Secret {node.value} not defined")
 
 
 yaml.SafeLoader.add_constructor("!include", _include_yaml)
diff --git a/script/gen_requirements_all.py b/script/gen_requirements_all.py
index dd36771994b..ce0aa672135 100755
--- a/script/gen_requirements_all.py
+++ b/script/gen_requirements_all.py
@@ -230,9 +230,7 @@ def gather_recursive_requirements(domain, seen=None):
         seen = set()
 
     seen.add(domain)
-    integration = Integration(
-        pathlib.Path("homeassistant/components/{}".format(domain))
-    )
+    integration = Integration(pathlib.Path(f"homeassistant/components/{domain}"))
     integration.load_manifest()
     reqs = set(integration.manifest["requirements"])
     for dep_domain in integration.manifest["dependencies"]:
@@ -272,13 +270,13 @@ def gather_requirements_from_manifests(errors, reqs):
         integration = integrations[domain]
 
         if not integration.manifest:
-            errors.append("The manifest for integration {} is invalid.".format(domain))
+            errors.append(f"The manifest for integration {domain} is invalid.")
             continue
 
         process_requirements(
             errors,
             integration.manifest["requirements"],
-            "homeassistant.components.{}".format(domain),
+            f"homeassistant.components.{domain}",
             reqs,
         )
 
@@ -306,13 +304,9 @@ def process_requirements(errors, module_requirements, package, reqs):
         if req in IGNORE_REQ:
             continue
         if "://" in req:
-            errors.append(
-                "{}[Only pypi dependencies are allowed: {}]".format(package, req)
-            )
+            errors.append(f"{package}[Only pypi dependencies are allowed: {req}]")
         if req.partition("==")[1] == "" and req not in IGNORE_PIN:
-            errors.append(
-                "{}[Please pin requirement {}, see {}]".format(package, req, URL_PIN)
-            )
+            errors.append(f"{package}[Please pin requirement {req}, see {URL_PIN}]")
         reqs.setdefault(req, []).append(package)
 
 
@@ -321,12 +315,12 @@ def generate_requirements_list(reqs):
     output = []
     for pkg, requirements in sorted(reqs.items(), key=lambda item: item[0]):
         for req in sorted(requirements):
-            output.append("\n# {}".format(req))
+            output.append(f"\n# {req}")
 
         if comment_requirement(pkg):
-            output.append("\n# {}\n".format(pkg))
+            output.append(f"\n# {pkg}\n")
         else:
-            output.append("\n{}\n".format(pkg))
+            output.append(f"\n{pkg}\n")
     return "".join(output)
 
 
diff --git a/script/hassfest/__main__.py b/script/hassfest/__main__.py
index 32c831816f0..a1168b15f7d 100644
--- a/script/hassfest/__main__.py
+++ b/script/hassfest/__main__.py
@@ -68,7 +68,7 @@ def main():
         print()
 
     for integration in sorted(invalid_itg, key=lambda itg: itg.domain):
-        print("Integration {}:".format(integration.domain))
+        print(f"Integration {integration.domain}:")
         for error in integration.errors:
             print("*", error)
         print()
diff --git a/script/hassfest/dependencies.py b/script/hassfest/dependencies.py
index ec71e2a9842..e9933995715 100644
--- a/script/hassfest/dependencies.py
+++ b/script/hassfest/dependencies.py
@@ -67,5 +67,5 @@ def validate(integrations: Dict[str, Integration], config):
         for dep in integration.manifest["dependencies"]:
             if dep not in integrations:
                 integration.add_error(
-                    "dependencies", "Dependency {} does not exist".format(dep)
+                    "dependencies", f"Dependency {dep} does not exist"
                 )
diff --git a/script/hassfest/model.py b/script/hassfest/model.py
index 8dc7012cc2e..77683d65961 100644
--- a/script/hassfest/model.py
+++ b/script/hassfest/model.py
@@ -79,20 +79,20 @@ class Integration:
         """Load manifest."""
         manifest_path = self.path / "manifest.json"
         if not manifest_path.is_file():
-            self.add_error("model", "Manifest file {} not found".format(manifest_path))
+            self.add_error("model", f"Manifest file {manifest_path} not found")
             return
 
         try:
             manifest = json.loads(manifest_path.read_text())
         except ValueError as err:
-            self.add_error("model", "Manifest contains invalid JSON: {}".format(err))
+            self.add_error("model", f"Manifest contains invalid JSON: {err}")
             return
 
         self.manifest = manifest
 
     def import_pkg(self, platform=None):
         """Import the Python file."""
-        pkg = "homeassistant.components.{}".format(self.domain)
+        pkg = f"homeassistant.components.{self.domain}"
         if platform is not None:
-            pkg += ".{}".format(platform)
+            pkg += f".{platform}"
         return importlib.import_module(pkg)
diff --git a/script/lazytox.py b/script/lazytox.py
index 9ec1107b51e..026d4639a06 100755
--- a/script/lazytox.py
+++ b/script/lazytox.py
@@ -34,7 +34,7 @@ def printc(the_color, *args):
         print(escape_codes[the_color] + msg + escape_codes["reset"])
     except KeyError:
         print(msg)
-        raise ValueError("Invalid color {}".format(the_color))
+        raise ValueError(f"Invalid color {the_color}")
 
 
 def validate_requirements_ok():
@@ -145,7 +145,7 @@ async def lint(files):
 
     lint_ok = True
     for err in res:
-        err_msg = "{} {}:{} {}".format(err.file, err.line, err.col, err.msg)
+        err_msg = f"{err.file} {err.line}:{err.col} {err.msg}"
 
         # tests/* does not have to pass lint
         if err.skip:
diff --git a/script/translations_download_split.py b/script/translations_download_split.py
index 7f653e3651e..375a9490e4e 100755
--- a/script/translations_download_split.py
+++ b/script/translations_download_split.py
@@ -40,18 +40,11 @@ def get_component_path(lang, component):
     """Get the component translation path."""
     if os.path.isdir(os.path.join("homeassistant", "components", component)):
         return os.path.join(
-            "homeassistant",
-            "components",
-            component,
-            ".translations",
-            "{}.json".format(lang),
+            "homeassistant", "components", component, ".translations", f"{lang}.json"
         )
     else:
         return os.path.join(
-            "homeassistant",
-            "components",
-            ".translations",
-            "{}.{}.json".format(component, lang),
+            "homeassistant", "components", ".translations", f"{component}.{lang}.json"
         )
 
 
@@ -64,7 +57,7 @@ def get_platform_path(lang, component, platform):
             component,
             platform,
             ".translations",
-            "{}.json".format(lang),
+            f"{lang}.json",
         )
     else:
         return os.path.join(
@@ -72,7 +65,7 @@ def get_platform_path(lang, component, platform):
             "components",
             component,
             ".translations",
-            "{}.{}.json".format(platform, lang),
+            f"{platform}.{lang}.json",
         )
 
 
diff --git a/script/translations_upload_merge.py b/script/translations_upload_merge.py
index f6ee6f27517..c44727f690f 100755
--- a/script/translations_upload_merge.py
+++ b/script/translations_upload_merge.py
@@ -35,7 +35,7 @@ def save_json(filename: str, data: Union[List, Dict]):
 def find_strings_files():
     """Return the paths of the strings source files."""
     return itertools.chain(
-        glob.iglob("strings*.json"), glob.iglob("*{}strings*.json".format(os.sep))
+        glob.iglob("strings*.json"), glob.iglob(f"*{os.sep}strings*.json")
     )
 
 
diff --git a/script/version_bump.py b/script/version_bump.py
index 7c584daae7e..25a3e26138d 100755
--- a/script/version_bump.py
+++ b/script/version_bump.py
@@ -81,7 +81,7 @@ def bump_version(version, bump_type):
             to_change["pre"] = ("b", 0)
 
     else:
-        assert False, "Unsupported type: {}".format(bump_type)
+        assert False, f"Unsupported type: {bump_type}"
 
     temp = Version("0")
     temp._version = version._version._replace(**to_change)
@@ -95,15 +95,9 @@ def write_version(version):
 
     major, minor, patch = str(version).split(".", 2)
 
-    content = re.sub(
-        "MAJOR_VERSION = .*\n", "MAJOR_VERSION = {}\n".format(major), content
-    )
-    content = re.sub(
-        "MINOR_VERSION = .*\n", "MINOR_VERSION = {}\n".format(minor), content
-    )
-    content = re.sub(
-        "PATCH_VERSION = .*\n", "PATCH_VERSION = '{}'\n".format(patch), content
-    )
+    content = re.sub("MAJOR_VERSION = .*\n", f"MAJOR_VERSION = {major}\n", content)
+    content = re.sub("MINOR_VERSION = .*\n", f"MINOR_VERSION = {minor}\n", content)
+    content = re.sub("PATCH_VERSION = .*\n", f"PATCH_VERSION = '{patch}'\n", content)
 
     with open("homeassistant/const.py", "wt") as fil:
         content = fil.write(content)
@@ -129,7 +123,7 @@ def main():
     if not arguments.commit:
         return
 
-    subprocess.run(["git", "commit", "-am", "Bumped version to {}".format(bumped)])
+    subprocess.run(["git", "commit", "-am", f"Bumped version to {bumped}"])
 
 
 def test_bump_version():