diff --git a/homeassistant/components/aladdin_connect/cover.py b/homeassistant/components/aladdin_connect/cover.py
index 7865a71aef9..05c24fc9a37 100644
--- a/homeassistant/components/aladdin_connect/cover.py
+++ b/homeassistant/components/aladdin_connect/cover.py
@@ -58,7 +58,7 @@ def setup_platform(
         _LOGGER.error("%s", ex)
         persistent_notification.create(
             hass,
-            "Error: {ex}<br />You will need to restart hass after fixing.",
+            f"Error: {ex}<br />You will need to restart hass after fixing.",
             title=NOTIFICATION_TITLE,
             notification_id=NOTIFICATION_ID,
         )
diff --git a/homeassistant/components/demo/fan.py b/homeassistant/components/demo/fan.py
index 06b19e90090..66440588f17 100644
--- a/homeassistant/components/demo/fan.py
+++ b/homeassistant/components/demo/fan.py
@@ -254,7 +254,7 @@ class AsyncDemoPercentageFan(BaseDemoFan, FanEntity):
         """Set new preset mode."""
         if self.preset_modes is None or preset_mode not in self.preset_modes:
             raise ValueError(
-                "{preset_mode} is not a valid preset_mode: {self.preset_modes}"
+                f"{preset_mode} is not a valid preset_mode: {self.preset_modes}"
             )
         self._preset_mode = preset_mode
         self._percentage = None
diff --git a/homeassistant/components/ezviz/switch.py b/homeassistant/components/ezviz/switch.py
index c2e562f62da..55a946f858a 100644
--- a/homeassistant/components/ezviz/switch.py
+++ b/homeassistant/components/ezviz/switch.py
@@ -65,7 +65,7 @@ class EzvizSwitch(EzvizEntity, SwitchEntity):
             )
 
         except (HTTPError, PyEzvizError) as err:
-            raise PyEzvizError("Failed to turn on switch {self._name}") from err
+            raise PyEzvizError(f"Failed to turn on switch {self._name}") from err
 
         if update_ok:
             await self.coordinator.async_request_refresh()
diff --git a/homeassistant/components/plex/media_browser.py b/homeassistant/components/plex/media_browser.py
index 1df624e265b..d65c01410c7 100644
--- a/homeassistant/components/plex/media_browser.py
+++ b/homeassistant/components/plex/media_browser.py
@@ -71,7 +71,7 @@ def browse_media(  # noqa: C901
         try:
             media_class = ITEM_TYPE_MEDIA_CLASS[item.type]
         except KeyError as err:
-            raise UnknownMediaType("Unknown type received: {item.type}") from err
+            raise UnknownMediaType(f"Unknown type received: {item.type}") from err
         payload = {
             "title": pretty_title(item, short_name),
             "media_class": media_class,
diff --git a/homeassistant/components/xiaomi_miio/gateway.py b/homeassistant/components/xiaomi_miio/gateway.py
index 27f426ff9d6..ebfb37ab8fb 100644
--- a/homeassistant/components/xiaomi_miio/gateway.py
+++ b/homeassistant/components/xiaomi_miio/gateway.py
@@ -81,7 +81,7 @@ class ConnectXiaomiGateway:
                 raise AuthException(error) from error
 
             raise SetupException(
-                "DeviceException during setup of xiaomi gateway with host {self._host}"
+                f"DeviceException during setup of xiaomi gateway with host {self._host}"
             ) from error
 
         # get the connected sub devices
@@ -115,7 +115,7 @@ class ConnectXiaomiGateway:
                 if not miio_cloud.login():
                     raise SetupException(
                         "Failed to login to Xiaomi Miio Cloud during setup of Xiaomi"
-                        " gateway with host {self._host}",
+                        f" gateway with host {self._host}",
                     )
                 devices_raw = miio_cloud.get_devices(self._cloud_country)
                 self._gateway_device.get_devices_from_dict(devices_raw)