diff --git a/homeassistant/components/adguard/sensor.py b/homeassistant/components/adguard/sensor.py
index 17e53270f25..e0c86e42d26 100644
--- a/homeassistant/components/adguard/sensor.py
+++ b/homeassistant/components/adguard/sensor.py
@@ -132,7 +132,7 @@ class AdGuardHomePercentageBlockedSensor(AdGuardHomeSensor):
     async def _adguard_update(self) -> None:
         """Update AdGuard Home entity."""
         percentage = await self.adguard.stats.blocked_percentage()
-        self._state = "{:.2f}".format(percentage)
+        self._state = f"{percentage:.2f}"
 
 
 class AdGuardHomeReplacedParentalSensor(AdGuardHomeSensor):
@@ -205,7 +205,7 @@ class AdGuardHomeAverageProcessingTimeSensor(AdGuardHomeSensor):
     async def _adguard_update(self) -> None:
         """Update AdGuard Home entity."""
         average = await self.adguard.stats.avg_processing_time()
-        self._state = "{:.2f}".format(average)
+        self._state = f"{average:.2f}"
 
 
 class AdGuardHomeRulesCountSensor(AdGuardHomeSensor):
diff --git a/homeassistant/components/airvisual/sensor.py b/homeassistant/components/airvisual/sensor.py
index ec2dea69031..20e5196c0f1 100644
--- a/homeassistant/components/airvisual/sensor.py
+++ b/homeassistant/components/airvisual/sensor.py
@@ -194,7 +194,7 @@ class AirVisualSensor(Entity):
     @property
     def unique_id(self):
         """Return a unique, HASS-friendly identifier for this entity."""
-        return "{0}_{1}_{2}".format(self._location_id, self._locale, self._type)
+        return f"{self._location_id}_{self._locale}_{self._type}"
 
     @property
     def unit_of_measurement(self):
@@ -210,7 +210,7 @@ class AirVisualSensor(Entity):
             return
 
         if self._type == SENSOR_TYPE_LEVEL:
-            aqi = data["aqi{0}".format(self._locale)]
+            aqi = data[f"aqi{self._locale}"]
             [level] = [
                 i
                 for i in POLLUTANT_LEVEL_MAPPING
@@ -219,9 +219,9 @@ class AirVisualSensor(Entity):
             self._state = level["label"]
             self._icon = level["icon"]
         elif self._type == SENSOR_TYPE_AQI:
-            self._state = data["aqi{0}".format(self._locale)]
+            self._state = data[f"aqi{self._locale}"]
         elif self._type == SENSOR_TYPE_POLLUTANT:
-            symbol = data["main{0}".format(self._locale)]
+            symbol = data[f"main{self._locale}"]
             self._state = POLLUTANT_MAPPING[symbol]["label"]
             self._attrs.update(
                 {
diff --git a/homeassistant/components/aladdin_connect/cover.py b/homeassistant/components/aladdin_connect/cover.py
index 770b663e8a3..b3da4fb4cbc 100644
--- a/homeassistant/components/aladdin_connect/cover.py
+++ b/homeassistant/components/aladdin_connect/cover.py
@@ -85,7 +85,7 @@ class AladdinDevice(CoverDevice):
     @property
     def unique_id(self):
         """Return a unique ID."""
-        return "{}-{}".format(self._device_id, self._number)
+        return f"{self._device_id}-{self._number}"
 
     @property
     def name(self):
diff --git a/homeassistant/components/alarmdecoder/alarm_control_panel.py b/homeassistant/components/alarmdecoder/alarm_control_panel.py
index c05dfd30d21..288c1dfd1c7 100644
--- a/homeassistant/components/alarmdecoder/alarm_control_panel.py
+++ b/homeassistant/components/alarmdecoder/alarm_control_panel.py
@@ -140,27 +140,27 @@ class AlarmDecoderAlarmPanel(alarm.AlarmControlPanel):
     def alarm_disarm(self, code=None):
         """Send disarm command."""
         if code:
-            self.hass.data[DATA_AD].send("{!s}1".format(code))
+            self.hass.data[DATA_AD].send(f"{code!s}1")
 
     def alarm_arm_away(self, code=None):
         """Send arm away command."""
         if code:
-            self.hass.data[DATA_AD].send("{!s}2".format(code))
+            self.hass.data[DATA_AD].send(f"{code!s}2")
 
     def alarm_arm_home(self, code=None):
         """Send arm home command."""
         if code:
-            self.hass.data[DATA_AD].send("{!s}3".format(code))
+            self.hass.data[DATA_AD].send(f"{code!s}3")
 
     def alarm_arm_night(self, code=None):
         """Send arm night command."""
         if code:
-            self.hass.data[DATA_AD].send("{!s}33".format(code))
+            self.hass.data[DATA_AD].send(f"{code!s}33")
 
     def alarm_toggle_chime(self, code=None):
         """Send toggle chime command."""
         if code:
-            self.hass.data[DATA_AD].send("{!s}9".format(code))
+            self.hass.data[DATA_AD].send(f"{code!s}9")
 
     def alarm_keypress(self, keypress):
         """Send custom keypresses."""
diff --git a/homeassistant/components/alexa/errors.py b/homeassistant/components/alexa/errors.py
index 56202b23e20..8c2fa692267 100644
--- a/homeassistant/components/alexa/errors.py
+++ b/homeassistant/components/alexa/errors.py
@@ -40,7 +40,7 @@ class AlexaInvalidEndpointError(AlexaError):
 
     def __init__(self, endpoint_id):
         """Initialize invalid endpoint error."""
-        msg = "The endpoint {} does not exist".format(endpoint_id)
+        msg = f"The endpoint {endpoint_id} does not exist"
         AlexaError.__init__(self, msg)
         self.endpoint_id = endpoint_id
 
@@ -73,7 +73,7 @@ class AlexaTempRangeError(AlexaError):
             "maximumValue": {"value": max_temp, "scale": API_TEMP_UNITS[unit]},
         }
         payload = {"validRange": temp_range}
-        msg = "The requested temperature {} is out of range".format(temp)
+        msg = f"The requested temperature {temp} is out of range"
 
         AlexaError.__init__(self, msg, payload)
 
diff --git a/homeassistant/components/alexa/handlers.py b/homeassistant/components/alexa/handlers.py
index cd5b56d60e2..1e636b96ee5 100644
--- a/homeassistant/components/alexa/handlers.py
+++ b/homeassistant/components/alexa/handlers.py
@@ -744,7 +744,7 @@ async def async_api_set_thermostat_mode(hass, config, directive, context):
         presets = entity.attributes.get(climate.ATTR_PRESET_MODES, [])
 
         if ha_preset not in presets:
-            msg = "The requested thermostat mode {} is not supported".format(ha_preset)
+            msg = f"The requested thermostat mode {ha_preset} is not supported"
             raise AlexaUnsupportedThermostatModeError(msg)
 
         service = climate.SERVICE_SET_PRESET_MODE
@@ -754,7 +754,7 @@ async def async_api_set_thermostat_mode(hass, config, directive, context):
         operation_list = entity.attributes.get(climate.ATTR_HVAC_MODES)
         ha_mode = next((k for k, v in API_THERMOSTAT_MODES.items() if v == mode), None)
         if ha_mode not in operation_list:
-            msg = "The requested thermostat mode {} is not supported".format(mode)
+            msg = f"The requested thermostat mode {mode} is not supported"
             raise AlexaUnsupportedThermostatModeError(msg)
 
         service = climate.SERVICE_SET_HVAC_MODE
diff --git a/homeassistant/components/alexa/intent.py b/homeassistant/components/alexa/intent.py
index edeb6865aad..4cb75c65bc9 100644
--- a/homeassistant/components/alexa/intent.py
+++ b/homeassistant/components/alexa/intent.py
@@ -113,7 +113,7 @@ async def async_handle_message(hass, message):
     handler = HANDLERS.get(req_type)
 
     if not handler:
-        raise UnknownRequest("Received unknown request {}".format(req_type))
+        raise UnknownRequest(f"Received unknown request {req_type}")
 
     return await handler(hass, message)
 
diff --git a/homeassistant/components/alexa/state_report.py b/homeassistant/components/alexa/state_report.py
index 1e22d5fc09f..e956abec7ad 100644
--- a/homeassistant/components/alexa/state_report.py
+++ b/homeassistant/components/alexa/state_report.py
@@ -60,7 +60,7 @@ async def async_send_changereport_message(
     """
     token = await config.async_get_access_token()
 
-    headers = {"Authorization": "Bearer {}".format(token)}
+    headers = {"Authorization": f"Bearer {token}"}
 
     endpoint = alexa_entity.alexa_id()
 
@@ -122,7 +122,7 @@ async def async_send_add_or_update_message(hass, config, entity_ids):
     """
     token = await config.async_get_access_token()
 
-    headers = {"Authorization": "Bearer {}".format(token)}
+    headers = {"Authorization": f"Bearer {token}"}
 
     endpoints = []
 
@@ -152,7 +152,7 @@ async def async_send_delete_message(hass, config, entity_ids):
     """
     token = await config.async_get_access_token()
 
-    headers = {"Authorization": "Bearer {}".format(token)}
+    headers = {"Authorization": f"Bearer {token}"}
 
     endpoints = []
 
diff --git a/homeassistant/components/alpha_vantage/sensor.py b/homeassistant/components/alpha_vantage/sensor.py
index 6d790e0719b..188567e4cf4 100644
--- a/homeassistant/components/alpha_vantage/sensor.py
+++ b/homeassistant/components/alpha_vantage/sensor.py
@@ -168,7 +168,7 @@ class AlphaVantageForeignExchange(Entity):
         if CONF_NAME in config:
             self._name = config.get(CONF_NAME)
         else:
-            self._name = "{}/{}".format(self._to_currency, self._from_currency)
+            self._name = f"{self._to_currency}/{self._from_currency}"
         self._unit_of_measurement = self._to_currency
         self._icon = ICONS.get(self._from_currency, "USD")
         self.values = None
diff --git a/homeassistant/components/ambiclimate/config_flow.py b/homeassistant/components/ambiclimate/config_flow.py
index db6d42d1d5c..99563dcb97d 100644
--- a/homeassistant/components/ambiclimate/config_flow.py
+++ b/homeassistant/components/ambiclimate/config_flow.py
@@ -130,7 +130,7 @@ class AmbiclimateFlowHandler(config_entries.ConfigFlow):
         return oauth
 
     def _cb_url(self):
-        return "{}{}".format(self.hass.config.api.base_url, AUTH_CALLBACK_PATH)
+        return f"{self.hass.config.api.base_url}{AUTH_CALLBACK_PATH}"
 
     async def _get_authorize_url(self):
         oauth = self._generate_oauth()
diff --git a/homeassistant/components/ambient_station/__init__.py b/homeassistant/components/ambient_station/__init__.py
index 82c29f79983..bff03eb422b 100644
--- a/homeassistant/components/ambient_station/__init__.py
+++ b/homeassistant/components/ambient_station/__init__.py
@@ -492,7 +492,7 @@ class AmbientWeatherEntity(Entity):
     @property
     def name(self):
         """Return the name of the sensor."""
-        return "{0}_{1}".format(self._station_name, self._sensor_name)
+        return f"{self._station_name}_{self._sensor_name}"
 
     @property
     def should_poll(self):
@@ -502,7 +502,7 @@ class AmbientWeatherEntity(Entity):
     @property
     def unique_id(self):
         """Return a unique, unchanging string that represents this sensor."""
-        return "{0}_{1}".format(self._mac_address, self._sensor_type)
+        return f"{self._mac_address}_{self._sensor_type}"
 
     async def async_added_to_hass(self):
         """Register callbacks."""
diff --git a/homeassistant/components/amcrest/camera.py b/homeassistant/components/amcrest/camera.py
index 483bdb2c7cf..f75a5adbe9c 100644
--- a/homeassistant/components/amcrest/camera.py
+++ b/homeassistant/components/amcrest/camera.py
@@ -490,7 +490,7 @@ class AmcrestCam(Camera):
             self._api.go_to_preset(action="start", preset_point_number=preset)
         except AmcrestError as error:
             log_update_error(
-                _LOGGER, "move", self.name, "camera to preset {}".format(preset), error
+                _LOGGER, "move", self.name, f"camera to preset {preset}", error
             )
 
     def _set_color_bw(self, cbw):
@@ -499,7 +499,7 @@ class AmcrestCam(Camera):
             self._api.day_night_color = _CBW.index(cbw)
         except AmcrestError as error:
             log_update_error(
-                _LOGGER, "set", self.name, "camera color mode to {}".format(cbw), error
+                _LOGGER, "set", self.name, f"camera color mode to {cbw}", error
             )
         else:
             self._color_bw = cbw
diff --git a/homeassistant/components/amcrest/helpers.py b/homeassistant/components/amcrest/helpers.py
index d24d6e0e707..a40d6ace50a 100644
--- a/homeassistant/components/amcrest/helpers.py
+++ b/homeassistant/components/amcrest/helpers.py
@@ -4,7 +4,7 @@ from .const import DOMAIN
 
 def service_signal(service, ident=None):
     """Encode service and identifier into signal."""
-    signal = "{}_{}".format(DOMAIN, service)
+    signal = f"{DOMAIN}_{service}"
     if ident:
         signal += "_{}".format(ident.replace(".", "_"))
     return signal
diff --git a/homeassistant/components/ampio/air_quality.py b/homeassistant/components/ampio/air_quality.py
index f55f20fc150..e63f59839a8 100644
--- a/homeassistant/components/ampio/air_quality.py
+++ b/homeassistant/components/ampio/air_quality.py
@@ -57,7 +57,7 @@ class AmpioSmogQuality(AirQualityEntity):
     @property
     def unique_id(self):
         """Return unique_name."""
-        return "ampio_smog_{}".format(self._station_id)
+        return f"ampio_smog_{self._station_id}"
 
     @property
     def particulate_matter_2_5(self):
diff --git a/homeassistant/components/android_ip_webcam/binary_sensor.py b/homeassistant/components/android_ip_webcam/binary_sensor.py
index d7bf009701d..0e9cca46afb 100644
--- a/homeassistant/components/android_ip_webcam/binary_sensor.py
+++ b/homeassistant/components/android_ip_webcam/binary_sensor.py
@@ -25,7 +25,7 @@ class IPWebcamBinarySensor(AndroidIPCamEntity, BinarySensorDevice):
 
         self._sensor = sensor
         self._mapped_name = KEY_MAP.get(self._sensor, self._sensor)
-        self._name = "{} {}".format(name, self._mapped_name)
+        self._name = f"{name} {self._mapped_name}"
         self._state = None
         self._unit = None
 
diff --git a/homeassistant/components/android_ip_webcam/sensor.py b/homeassistant/components/android_ip_webcam/sensor.py
index 20f4acebca6..05c1fe16c61 100644
--- a/homeassistant/components/android_ip_webcam/sensor.py
+++ b/homeassistant/components/android_ip_webcam/sensor.py
@@ -39,7 +39,7 @@ class IPWebcamSensor(AndroidIPCamEntity):
 
         self._sensor = sensor
         self._mapped_name = KEY_MAP.get(self._sensor, self._sensor)
-        self._name = "{} {}".format(name, self._mapped_name)
+        self._name = f"{name} {self._mapped_name}"
         self._state = None
         self._unit = None
 
diff --git a/homeassistant/components/android_ip_webcam/switch.py b/homeassistant/components/android_ip_webcam/switch.py
index 5b2f5dad5e1..2d5f2412d85 100644
--- a/homeassistant/components/android_ip_webcam/switch.py
+++ b/homeassistant/components/android_ip_webcam/switch.py
@@ -39,7 +39,7 @@ class IPWebcamSettingsSwitch(AndroidIPCamEntity, SwitchDevice):
 
         self._setting = setting
         self._mapped_name = KEY_MAP.get(self._setting, self._setting)
-        self._name = "{} {}".format(name, self._mapped_name)
+        self._name = f"{name} {self._mapped_name}"
         self._state = False
 
     @property
diff --git a/homeassistant/components/androidtv/media_player.py b/homeassistant/components/androidtv/media_player.py
index 2db210b56f3..d68f47b1b0a 100644
--- a/homeassistant/components/androidtv/media_player.py
+++ b/homeassistant/components/androidtv/media_player.py
@@ -392,7 +392,7 @@ class ADBDevice(MediaPlayerDevice):
         """Send an ADB command to an Android TV / Fire TV device."""
         key = self._keys.get(cmd)
         if key:
-            self.aftv.adb_shell("input keyevent {}".format(key))
+            self.aftv.adb_shell(f"input keyevent {key}")
             self._adb_response = None
             self.schedule_update_ha_state()
             return
diff --git a/homeassistant/components/apache_kafka/__init__.py b/homeassistant/components/apache_kafka/__init__.py
index caf96c61fb8..e0c8b824913 100644
--- a/homeassistant/components/apache_kafka/__init__.py
+++ b/homeassistant/components/apache_kafka/__init__.py
@@ -81,7 +81,7 @@ class KafkaManager:
         self._hass = hass
         self._producer = AIOKafkaProducer(
             loop=hass.loop,
-            bootstrap_servers="{0}:{1}".format(ip_address, port),
+            bootstrap_servers=f"{ip_address}:{port}",
             compression_type="gzip",
         )
         self._topic = topic
diff --git a/homeassistant/components/apns/notify.py b/homeassistant/components/apns/notify.py
index 0b95cb9f0cb..dbd45013a3c 100644
--- a/homeassistant/components/apns/notify.py
+++ b/homeassistant/components/apns/notify.py
@@ -50,7 +50,7 @@ def get_service(hass, config, discovery_info=None):
 
     service = ApnsNotificationService(hass, name, topic, sandbox, cert_file)
     hass.services.register(
-        DOMAIN, "apns_{}".format(name), service.register, schema=REGISTER_SERVICE_SCHEMA
+        DOMAIN, f"apns_{name}", service.register, schema=REGISTER_SERVICE_SCHEMA
     )
     return service
 
@@ -98,7 +98,7 @@ class ApnsDevice:
         The full id of a device that is tracked by the device
         tracking component.
         """
-        return "{}.{}".format(DEVICE_TRACKER_DOMAIN, self.tracking_id)
+        return f"{DEVICE_TRACKER_DOMAIN}.{self.tracking_id}"
 
     @property
     def disabled(self):
@@ -124,9 +124,9 @@ def _write_device(out, device):
     """Write a single device to file."""
     attributes = []
     if device.name is not None:
-        attributes.append("name: {}".format(device.name))
+        attributes.append(f"name: {device.name}")
     if device.tracking_device_id is not None:
-        attributes.append("tracking_device_id: {}".format(device.tracking_device_id))
+        attributes.append(f"tracking_device_id: {device.tracking_device_id}")
     if device.disabled:
         attributes.append("disabled: True")
 
diff --git a/homeassistant/components/apple_tv/media_player.py b/homeassistant/components/apple_tv/media_player.py
index 3e77c7a1cfd..9ac5ba77f98 100644
--- a/homeassistant/components/apple_tv/media_player.py
+++ b/homeassistant/components/apple_tv/media_player.py
@@ -213,7 +213,7 @@ class AppleTvDevice(MediaPlayerDevice):
             title = self._playing.title
             return title if title else "No title"
 
-        return "Establishing a connection to {0}...".format(self._name)
+        return f"Establishing a connection to {self._name}..."
 
     @property
     def supported_features(self):
diff --git a/homeassistant/components/aprs/device_tracker.py b/homeassistant/components/aprs/device_tracker.py
index c5ae8ed8414..86b0b6f48af 100644
--- a/homeassistant/components/aprs/device_tracker.py
+++ b/homeassistant/components/aprs/device_tracker.py
@@ -70,7 +70,7 @@ def gps_accuracy(gps, posambiguity: int) -> int:
 
         accuracy = round(dist_m)
     else:
-        message = "APRS position ambiguity must be 0-4, not '{0}'.".format(posambiguity)
+        message = f"APRS position ambiguity must be 0-4, not '{posambiguity}'."
         raise ValueError(message)
 
     return accuracy
@@ -147,8 +147,7 @@ class AprsListenerThread(threading.Thread):
             )
             self.ais.connect()
             self.start_complete(
-                True,
-                "Connected to {0} with callsign {1}.".format(self.host, self.callsign),
+                True, f"Connected to {self.host} with callsign {self.callsign}."
             )
             self.ais.consumer(callback=self.rx_msg, immortal=True)
         except (AprsConnectionError, LoginError) as err:
diff --git a/homeassistant/components/arcam_fmj/const.py b/homeassistant/components/arcam_fmj/const.py
index b065e1a0833..dc5a576acec 100644
--- a/homeassistant/components/arcam_fmj/const.py
+++ b/homeassistant/components/arcam_fmj/const.py
@@ -9,5 +9,5 @@ DEFAULT_PORT = 50000
 DEFAULT_NAME = "Arcam FMJ"
 DEFAULT_SCAN_INTERVAL = 5
 
-DOMAIN_DATA_ENTRIES = "{}.entries".format(DOMAIN)
-DOMAIN_DATA_CONFIG = "{}.config".format(DOMAIN)
+DOMAIN_DATA_ENTRIES = f"{DOMAIN}.entries"
+DOMAIN_DATA_CONFIG = f"{DOMAIN}.config"
diff --git a/homeassistant/components/arcam_fmj/media_player.py b/homeassistant/components/arcam_fmj/media_player.py
index 971abc3e26d..231e9821dc6 100644
--- a/homeassistant/components/arcam_fmj/media_player.py
+++ b/homeassistant/components/arcam_fmj/media_player.py
@@ -319,7 +319,7 @@ class ArcamFmj(MediaPlayerDevice):
         channel = self.media_channel
 
         if channel:
-            value = "{} - {}".format(source.name, channel)
+            value = f"{source.name} - {channel}"
         else:
             value = source.name
         return value
diff --git a/homeassistant/components/arest/binary_sensor.py b/homeassistant/components/arest/binary_sensor.py
index 96ffa371864..669a28b7078 100644
--- a/homeassistant/components/arest/binary_sensor.py
+++ b/homeassistant/components/arest/binary_sensor.py
@@ -73,9 +73,7 @@ class ArestBinarySensor(BinarySensorDevice):
         self._pin = pin
 
         if self._pin is not None:
-            request = requests.get(
-                "{}/mode/{}/i".format(self._resource, self._pin), timeout=10
-            )
+            request = requests.get(f"{self._resource}/mode/{self._pin}/i", timeout=10)
             if request.status_code != 200:
                 _LOGGER.error("Can't set mode of %s", self._resource)
 
@@ -112,9 +110,7 @@ class ArestData:
     def update(self):
         """Get the latest data from aREST device."""
         try:
-            response = requests.get(
-                "{}/digital/{}".format(self._resource, self._pin), timeout=10
-            )
+            response = requests.get(f"{self._resource}/digital/{self._pin}", timeout=10)
             self.data = {"state": response.json()["return_value"]}
         except requests.exceptions.ConnectionError:
             _LOGGER.error("No route to device '%s'", self._resource)
diff --git a/homeassistant/components/arest/sensor.py b/homeassistant/components/arest/sensor.py
index 533adeccb5e..2416eeb0ebb 100644
--- a/homeassistant/components/arest/sensor.py
+++ b/homeassistant/components/arest/sensor.py
@@ -148,9 +148,7 @@ class ArestSensor(Entity):
         self._renderer = renderer
 
         if self._pin is not None:
-            request = requests.get(
-                "{}/mode/{}/i".format(self._resource, self._pin), timeout=10
-            )
+            request = requests.get(f"{self._resource}/mode/{self._pin}/i", timeout=10)
             if request.status_code != 200:
                 _LOGGER.error("Can't set mode of %s", self._resource)
 
@@ -212,7 +210,7 @@ class ArestData:
                         self.data = {"value": response.json()["return_value"]}
                 except TypeError:
                     response = requests.get(
-                        "{}/digital/{}".format(self._resource, self._pin), timeout=10
+                        f"{self._resource}/digital/{self._pin}", timeout=10
                     )
                     self.data = {"value": response.json()["return_value"]}
             self.available = True
diff --git a/homeassistant/components/arest/switch.py b/homeassistant/components/arest/switch.py
index 558df89100e..e1a7edacb7e 100644
--- a/homeassistant/components/arest/switch.py
+++ b/homeassistant/components/arest/switch.py
@@ -114,7 +114,7 @@ class ArestSwitchFunction(ArestSwitchBase):
         super().__init__(resource, location, name)
         self._func = func
 
-        request = requests.get("{}/{}".format(self._resource, self._func), timeout=10)
+        request = requests.get(f"{self._resource}/{self._func}", timeout=10)
 
         if request.status_code != 200:
             _LOGGER.error("Can't find function")
@@ -130,9 +130,7 @@ class ArestSwitchFunction(ArestSwitchBase):
     def turn_on(self, **kwargs):
         """Turn the device on."""
         request = requests.get(
-            "{}/{}".format(self._resource, self._func),
-            timeout=10,
-            params={"params": "1"},
+            f"{self._resource}/{self._func}", timeout=10, params={"params": "1"}
         )
 
         if request.status_code == 200:
@@ -143,9 +141,7 @@ class ArestSwitchFunction(ArestSwitchBase):
     def turn_off(self, **kwargs):
         """Turn the device off."""
         request = requests.get(
-            "{}/{}".format(self._resource, self._func),
-            timeout=10,
-            params={"params": "0"},
+            f"{self._resource}/{self._func}", timeout=10, params={"params": "0"}
         )
 
         if request.status_code == 200:
@@ -158,9 +154,7 @@ class ArestSwitchFunction(ArestSwitchBase):
     def update(self):
         """Get the latest data from aREST API and update the state."""
         try:
-            request = requests.get(
-                "{}/{}".format(self._resource, self._func), timeout=10
-            )
+            request = requests.get(f"{self._resource}/{self._func}", timeout=10)
             self._state = request.json()["return_value"] != 0
             self._available = True
         except requests.exceptions.ConnectionError:
@@ -177,9 +171,7 @@ class ArestSwitchPin(ArestSwitchBase):
         self._pin = pin
         self.invert = invert
 
-        request = requests.get(
-            "{}/mode/{}/o".format(self._resource, self._pin), timeout=10
-        )
+        request = requests.get(f"{self._resource}/mode/{self._pin}/o", timeout=10)
         if request.status_code != 200:
             _LOGGER.error("Can't set mode")
             self._available = False
@@ -188,8 +180,7 @@ class ArestSwitchPin(ArestSwitchBase):
         """Turn the device on."""
         turn_on_payload = int(not self.invert)
         request = requests.get(
-            "{}/digital/{}/{}".format(self._resource, self._pin, turn_on_payload),
-            timeout=10,
+            f"{self._resource}/digital/{self._pin}/{turn_on_payload}", timeout=10
         )
         if request.status_code == 200:
             self._state = True
@@ -200,8 +191,7 @@ class ArestSwitchPin(ArestSwitchBase):
         """Turn the device off."""
         turn_off_payload = int(self.invert)
         request = requests.get(
-            "{}/digital/{}/{}".format(self._resource, self._pin, turn_off_payload),
-            timeout=10,
+            f"{self._resource}/digital/{self._pin}/{turn_off_payload}", timeout=10
         )
         if request.status_code == 200:
             self._state = False
@@ -211,9 +201,7 @@ class ArestSwitchPin(ArestSwitchBase):
     def update(self):
         """Get the latest data from aREST API and update the state."""
         try:
-            request = requests.get(
-                "{}/digital/{}".format(self._resource, self._pin), timeout=10
-            )
+            request = requests.get(f"{self._resource}/digital/{self._pin}", timeout=10)
             status_value = int(self.invert)
             self._state = request.json()["return_value"] != status_value
             self._available = True
diff --git a/homeassistant/components/august/camera.py b/homeassistant/components/august/camera.py
index a8335d1aa52..2492eb75418 100644
--- a/homeassistant/components/august/camera.py
+++ b/homeassistant/components/august/camera.py
@@ -73,4 +73,4 @@ class AugustCamera(Camera):
     @property
     def unique_id(self) -> str:
         """Get the unique id of the camera."""
-        return "{:s}_camera".format(self._doorbell.device_id)
+        return f"{self._doorbell.device_id:s}_camera"
diff --git a/homeassistant/components/august/lock.py b/homeassistant/components/august/lock.py
index e919c47dd4c..8b8c019eb2d 100644
--- a/homeassistant/components/august/lock.py
+++ b/homeassistant/components/august/lock.py
@@ -93,4 +93,4 @@ class AugustLock(LockDevice):
     @property
     def unique_id(self) -> str:
         """Get the unique id of the lock."""
-        return "{:s}_lock".format(self._lock.device_id)
+        return f"{self._lock.device_id:s}_lock"
diff --git a/homeassistant/components/aurora/binary_sensor.py b/homeassistant/components/aurora/binary_sensor.py
index 0d983f35e37..a69433c4186 100644
--- a/homeassistant/components/aurora/binary_sensor.py
+++ b/homeassistant/components/aurora/binary_sensor.py
@@ -64,7 +64,7 @@ class AuroraSensor(BinarySensorDevice):
     @property
     def name(self):
         """Return the name of the sensor."""
-        return "{}".format(self._name)
+        return f"{self._name}"
 
     @property
     def is_on(self):
diff --git a/homeassistant/components/aurora_abb_powerone/sensor.py b/homeassistant/components/aurora_abb_powerone/sensor.py
index 456b5080484..05ed5fa99bf 100644
--- a/homeassistant/components/aurora_abb_powerone/sensor.py
+++ b/homeassistant/components/aurora_abb_powerone/sensor.py
@@ -49,7 +49,7 @@ class AuroraABBSolarPVMonitorSensor(Entity):
 
     def __init__(self, client, name, typename):
         """Initialize the sensor."""
-        self._name = "{} {}".format(name, typename)
+        self._name = f"{name} {typename}"
         self.client = client
         self._state = None
 
diff --git a/homeassistant/components/auth/mfa_setup_flow.py b/homeassistant/components/auth/mfa_setup_flow.py
index c18bc276a44..42dab7ebb5a 100644
--- a/homeassistant/components/auth/mfa_setup_flow.py
+++ b/homeassistant/components/auth/mfa_setup_flow.py
@@ -34,7 +34,7 @@ async def async_setup(hass):
         """Create a setup flow. handler is a mfa module."""
         mfa_module = hass.auth.get_auth_mfa_module(handler)
         if mfa_module is None:
-            raise ValueError("Mfa module {} is not found".format(handler))
+            raise ValueError(f"Mfa module {handler} is not found")
 
         user_id = data.pop("user_id")
         return await mfa_module.async_setup_flow(user_id)
@@ -80,9 +80,7 @@ def websocket_setup_mfa(
         if mfa_module is None:
             connection.send_message(
                 websocket_api.error_message(
-                    msg["id"],
-                    "no_module",
-                    "MFA module {} is not found".format(mfa_module_id),
+                    msg["id"], "no_module", f"MFA module {mfa_module_id} is not found"
                 )
             )
             return
@@ -117,7 +115,7 @@ def websocket_depose_mfa(
                 websocket_api.error_message(
                     msg["id"],
                     "disable_failed",
-                    "Cannot disable MFA Module {}: {}".format(mfa_module_id, err),
+                    f"Cannot disable MFA Module {mfa_module_id}: {err}",
                 )
             )
             return
diff --git a/homeassistant/components/awair/sensor.py b/homeassistant/components/awair/sensor.py
index 85b5a0be191..c899e009796 100644
--- a/homeassistant/components/awair/sensor.py
+++ b/homeassistant/components/awair/sensor.py
@@ -150,7 +150,7 @@ class AwairSensor(Entity):
         """Initialize the sensor."""
         self._uuid = device[CONF_UUID]
         self._device_class = SENSOR_TYPES[sensor_type]["device_class"]
-        self._name = "Awair {}".format(self._device_class)
+        self._name = f"Awair {self._device_class}"
         unit = SENSOR_TYPES[sensor_type]["unit_of_measurement"]
         self._unit_of_measurement = unit
         self._data = data
@@ -202,7 +202,7 @@ class AwairSensor(Entity):
     @property
     def unique_id(self):
         """Return the unique id of this entity."""
-        return "{}_{}".format(self._uuid, self._type)
+        return f"{self._uuid}_{self._type}"
 
     @property
     def unit_of_measurement(self):
diff --git a/homeassistant/components/axis/axis_base.py b/homeassistant/components/axis/axis_base.py
index 3864ac344e1..f22a169a102 100644
--- a/homeassistant/components/axis/axis_base.py
+++ b/homeassistant/components/axis/axis_base.py
@@ -72,7 +72,7 @@ class AxisEventBase(AxisEntityBase):
     @property
     def name(self):
         """Return the name of the event."""
-        return "{} {} {}".format(self.device.name, self.event.TYPE, self.event.id)
+        return f"{self.device.name} {self.event.TYPE} {self.event.id}"
 
     @property
     def should_poll(self):
@@ -82,4 +82,4 @@ class AxisEventBase(AxisEntityBase):
     @property
     def unique_id(self):
         """Return a unique identifier for this device."""
-        return "{}-{}-{}".format(self.device.serial, self.event.topic, self.event.id)
+        return f"{self.device.serial}-{self.event.topic}-{self.event.id}"
diff --git a/homeassistant/components/axis/camera.py b/homeassistant/components/axis/camera.py
index e7e0f7459f3..a55e45dd374 100644
--- a/homeassistant/components/axis/camera.py
+++ b/homeassistant/components/axis/camera.py
@@ -92,4 +92,4 @@ class AxisCamera(AxisEntityBase, MjpegCamera):
     @property
     def unique_id(self):
         """Return a unique identifier for this device."""
-        return "{}-camera".format(self.device.serial)
+        return f"{self.device.serial}-camera"
diff --git a/homeassistant/components/axis/config_flow.py b/homeassistant/components/axis/config_flow.py
index f93e49d9818..3b5efe96760 100644
--- a/homeassistant/components/axis/config_flow.py
+++ b/homeassistant/components/axis/config_flow.py
@@ -137,9 +137,9 @@ class AxisFlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
                 if entry.data[CONF_MODEL] == self.model
             ]
 
-            self.name = "{}".format(self.model)
+            self.name = f"{self.model}"
             for idx in range(len(same_model) + 1):
-                self.name = "{} {}".format(self.model, idx)
+                self.name = f"{self.model} {idx}"
                 if self.name not in same_model:
                     break
 
@@ -150,7 +150,7 @@ class AxisFlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
             CONF_MODEL: self.model,
         }
 
-        title = "{} - {}".format(self.model, self.serial_number)
+        title = f"{self.model} - {self.serial_number}"
         return self.async_create_entry(title=title, data=data)
 
     async def _update_entry(self, entry, host):
diff --git a/homeassistant/components/axis/device.py b/homeassistant/components/axis/device.py
index 465d8c73b74..3b91f7e1474 100644
--- a/homeassistant/components/axis/device.py
+++ b/homeassistant/components/axis/device.py
@@ -65,7 +65,7 @@ class AxisNetworkDevice:
             connections={(CONNECTION_NETWORK_MAC, self.serial)},
             identifiers={(DOMAIN, self.serial)},
             manufacturer="Axis Communications AB",
-            model="{} {}".format(self.model, self.product_type),
+            model=f"{self.model} {self.product_type}",
             name=self.name,
             sw_version=self.fw_version,
         )
@@ -115,7 +115,7 @@ class AxisNetworkDevice:
     @property
     def event_new_address(self):
         """Device specific event to signal new device address."""
-        return "axis_new_address_{}".format(self.serial)
+        return f"axis_new_address_{self.serial}"
 
     @staticmethod
     async def async_new_address_callback(hass, entry):
@@ -131,7 +131,7 @@ class AxisNetworkDevice:
     @property
     def event_reachable(self):
         """Device specific event to signal a change in connection status."""
-        return "axis_reachable_{}".format(self.serial)
+        return f"axis_reachable_{self.serial}"
 
     @callback
     def async_connection_status_callback(self, status):
@@ -149,7 +149,7 @@ class AxisNetworkDevice:
     @property
     def event_new_sensor(self):
         """Device specific event to signal new sensor available."""
-        return "axis_add_sensor_{}".format(self.serial)
+        return f"axis_add_sensor_{self.serial}"
 
     @callback
     def async_event_callback(self, action, event_id):