diff --git a/homeassistant/components/tado/climate.py b/homeassistant/components/tado/climate.py
index 15e01db4082..1108b32af4e 100644
--- a/homeassistant/components/tado/climate.py
+++ b/homeassistant/components/tado/climate.py
@@ -124,7 +124,7 @@ def create_climate_device(tado, hass, zone, name, zone_id):
     max_temp = float(temperatures["celsius"]["max"])
     step = temperatures["celsius"].get("step", PRECISION_TENTHS)
 
-    data_id = "zone {} {}".format(name, zone_id)
+    data_id = f"zone {name} {zone_id}"
     device = TadoClimate(
         tado,
         name,
diff --git a/homeassistant/components/tado/sensor.py b/homeassistant/components/tado/sensor.py
index 5cfdbd1f30c..7b4bd643f3d 100644
--- a/homeassistant/components/tado/sensor.py
+++ b/homeassistant/components/tado/sensor.py
@@ -80,7 +80,7 @@ def setup_platform(hass, config, add_entities, discovery_info=None):
 
 def create_zone_sensor(tado, zone, name, zone_id, variable):
     """Create a zone sensor."""
-    data_id = "zone {} {}".format(name, zone_id)
+    data_id = f"zone {name} {zone_id}"
 
     tado.add_sensor(
         data_id,
@@ -92,7 +92,7 @@ def create_zone_sensor(tado, zone, name, zone_id, variable):
 
 def create_device_sensor(tado, device, name, device_id, variable):
     """Create a device sensor."""
-    data_id = "device {} {}".format(name, device_id)
+    data_id = f"device {name} {device_id}"
 
     tado.add_sensor(
         data_id,
@@ -118,7 +118,7 @@ class TadoSensor(Entity):
         self.zone_id = zone_id
         self.zone_variable = zone_variable
 
-        self._unique_id = "{} {}".format(zone_variable, zone_id)
+        self._unique_id = f"{zone_variable} {zone_id}"
         self._data_id = data_id
 
         self._state = None
@@ -132,7 +132,7 @@ class TadoSensor(Entity):
     @property
     def name(self):
         """Return the name of the sensor."""
-        return "{} {}".format(self.zone_name, self.zone_variable)
+        return f"{self.zone_name} {self.zone_variable}"
 
     @property
     def state(self):
diff --git a/homeassistant/components/tapsaff/binary_sensor.py b/homeassistant/components/tapsaff/binary_sensor.py
index 3b4bcfa8ea5..fe6b01ced4e 100644
--- a/homeassistant/components/tapsaff/binary_sensor.py
+++ b/homeassistant/components/tapsaff/binary_sensor.py
@@ -45,7 +45,7 @@ class TapsAffSensor(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/ted5000/sensor.py b/homeassistant/components/ted5000/sensor.py
index 922d88d44bf..ea0963a092e 100644
--- a/homeassistant/components/ted5000/sensor.py
+++ b/homeassistant/components/ted5000/sensor.py
@@ -32,7 +32,7 @@ def setup_platform(hass, config, add_entities, discovery_info=None):
     host = config.get(CONF_HOST)
     port = config.get(CONF_PORT)
     name = config.get(CONF_NAME)
-    url = "http://{}:{}/api/LiveData.xml".format(host, port)
+    url = f"http://{host}:{port}/api/LiveData.xml"
 
     gateway = Ted5000Gateway(url)
 
diff --git a/homeassistant/components/teksavvy/sensor.py b/homeassistant/components/teksavvy/sensor.py
index 51914d7a4fc..74c39a221ba 100644
--- a/homeassistant/components/teksavvy/sensor.py
+++ b/homeassistant/components/teksavvy/sensor.py
@@ -90,7 +90,7 @@ class TekSavvySensor(Entity):
     @property
     def name(self):
         """Return the name of the sensor."""
-        return "{} {}".format(self.client_name, self._name)
+        return f"{self.client_name} {self._name}"
 
     @property
     def state(self):
diff --git a/homeassistant/components/telegram_bot/__init__.py b/homeassistant/components/telegram_bot/__init__.py
index e73c25203e0..a36f41edf3b 100644
--- a/homeassistant/components/telegram_bot/__init__.py
+++ b/homeassistant/components/telegram_bot/__init__.py
@@ -554,7 +554,7 @@ class TelegramNotificationService:
     def send_message(self, message="", target=None, **kwargs):
         """Send a message to one or multiple pre-allowed chat IDs."""
         title = kwargs.get(ATTR_TITLE)
-        text = "{}\n{}".format(title, message) if title else message
+        text = f"{title}\n{message}" if title else message
         params = self._get_msg_kwargs(kwargs)
         for chat_id in self._get_target_chat_ids(target):
             _LOGGER.debug("Send message in chat ID %s with params: %s", chat_id, params)
@@ -590,7 +590,7 @@ class TelegramNotificationService:
         if type_edit == SERVICE_EDIT_MESSAGE:
             message = kwargs.get(ATTR_MESSAGE)
             title = kwargs.get(ATTR_TITLE)
-            text = "{}\n{}".format(title, message) if title else message
+            text = f"{title}\n{message}" if title else message
             _LOGGER.debug(
                 "Editing message with ID %s.", message_id or inline_message_id
             )
diff --git a/homeassistant/components/telegram_bot/webhooks.py b/homeassistant/components/telegram_bot/webhooks.py
index 166f48c4961..c71510eddd9 100644
--- a/homeassistant/components/telegram_bot/webhooks.py
+++ b/homeassistant/components/telegram_bot/webhooks.py
@@ -45,7 +45,7 @@ async def async_setup_platform(hass, config):
     else:
         _LOGGER.debug("telegram webhook Status: %s", current_status)
 
-    handler_url = "{0}{1}".format(base_url, TELEGRAM_HANDLER_URL)
+    handler_url = f"{base_url}{TELEGRAM_HANDLER_URL}"
     if not handler_url.startswith("https"):
         _LOGGER.error("Invalid telegram webhook %s must be https", handler_url)
         return False
diff --git a/homeassistant/components/tellduslive/__init__.py b/homeassistant/components/tellduslive/__init__.py
index 05662cc2b23..7234127a152 100644
--- a/homeassistant/components/tellduslive/__init__.py
+++ b/homeassistant/components/tellduslive/__init__.py
@@ -46,7 +46,7 @@ DATA_CONFIG_ENTRY_LOCK = "tellduslive_config_entry_lock"
 CONFIG_ENTRY_IS_SETUP = "telldus_config_entry_is_setup"
 
 NEW_CLIENT_TASK = "telldus_new_client_task"
-INTERVAL_TRACKER = "{}_INTERVAL".format(DOMAIN)
+INTERVAL_TRACKER = f"{DOMAIN}_INTERVAL"
 
 
 async def async_setup_entry(hass, entry):
diff --git a/homeassistant/components/tellstick/sensor.py b/homeassistant/components/tellstick/sensor.py
index 24c038f870a..83b56c2cf39 100644
--- a/homeassistant/components/tellstick/sensor.py
+++ b/homeassistant/components/tellstick/sensor.py
@@ -107,7 +107,7 @@ class TellstickSensor(Entity):
         self._unit_of_measurement = sensor_info.unit or None
         self._value = None
 
-        self._name = "{} {}".format(name, sensor_info.name)
+        self._name = f"{name} {sensor_info.name}"
 
     @property
     def name(self):
diff --git a/homeassistant/components/tesla/sensor.py b/homeassistant/components/tesla/sensor.py
index 98cf5e47fd9..c737b2f0bba 100644
--- a/homeassistant/components/tesla/sensor.py
+++ b/homeassistant/components/tesla/sensor.py
@@ -43,13 +43,13 @@ class TeslaSensor(TeslaDevice, Entity):
         super().__init__(tesla_device, controller)
 
         if self.type:
-            self._name = "{} ({})".format(self.tesla_device.name, self.type)
+            self._name = f"{self.tesla_device.name} ({self.type})"
 
     @property
     def unique_id(self) -> str:
         """Return a unique ID."""
         if self.type:
-            return "{}_{}".format(self.tesla_id, self.type)
+            return f"{self.tesla_id}_{self.type}"
         return self.tesla_id
 
     @property
diff --git a/homeassistant/components/thermoworks_smoke/sensor.py b/homeassistant/components/thermoworks_smoke/sensor.py
index 08e6afc3e56..70a16287fcc 100644
--- a/homeassistant/components/thermoworks_smoke/sensor.py
+++ b/homeassistant/components/thermoworks_smoke/sensor.py
@@ -86,7 +86,7 @@ def setup_platform(hass, config, add_entities, discovery_info=None):
 
         add_entities(dev, True)
     except HTTPError as error:
-        msg = "{}".format(error.strerror)
+        msg = f"{error.strerror}"
         if "EMAIL_NOT_FOUND" in msg or "INVALID_PASSWORD" in msg:
             _LOGGER.error("Invalid email and password combination")
         else:
@@ -105,7 +105,7 @@ class ThermoworksSmokeSensor(Entity):
         self._state = None
         self._attributes = {}
         self._unit_of_measurement = TEMP_FAHRENHEIT
-        self._unique_id = "{serial}-{type}".format(serial=serial, type=sensor_type)
+        self._unique_id = f"{serial}-{sensor_type}"
         self.serial = serial
         self.mgr = mgr
         self.update_unit()
diff --git a/homeassistant/components/thethingsnetwork/sensor.py b/homeassistant/components/thethingsnetwork/sensor.py
index ccba2bc4b38..3ba58a688fe 100644
--- a/homeassistant/components/thethingsnetwork/sensor.py
+++ b/homeassistant/components/thethingsnetwork/sensor.py
@@ -65,7 +65,7 @@ class TtnDataSensor(Entity):
         self._device_id = device_id
         self._unit_of_measurement = unit_of_measurement
         self._value = value
-        self._name = "{} {}".format(self._device_id, self._value)
+        self._name = f"{self._device_id} {self._value}"
 
     @property
     def name(self):
@@ -116,10 +116,7 @@ class TtnDataStorage:
         self._url = TTN_DATA_STORAGE_URL.format(
             app_id=app_id, endpoint="api/v2/query", device_id=device_id
         )
-        self._headers = {
-            ACCEPT: CONTENT_TYPE_JSON,
-            AUTHORIZATION: "key {}".format(access_key),
-        }
+        self._headers = {ACCEPT: CONTENT_TYPE_JSON, AUTHORIZATION: f"key {access_key}"}
 
     async def async_update(self):
         """Get the current state from The Things Network Data Storage."""
diff --git a/homeassistant/components/tibber/sensor.py b/homeassistant/components/tibber/sensor.py
index aba6499ca6f..3dfe0265bde 100644
--- a/homeassistant/components/tibber/sensor.py
+++ b/homeassistant/components/tibber/sensor.py
@@ -149,7 +149,7 @@ class TibberSensorRT(Entity):
         self._device_state_attributes = {}
         self._unit_of_measurement = "W"
         nickname = tibber_home.info["viewer"]["home"]["appNickname"]
-        self._name = "Real time consumption {}".format(nickname)
+        self._name = f"Real time consumption {nickname}"
 
     async def async_added_to_hass(self):
         """Start unavailability tracking."""
@@ -215,4 +215,4 @@ class TibberSensorRT(Entity):
         """Return a unique ID."""
         home = self._tibber_home.info["viewer"]["home"]
         _id = home["meteringPointData"]["consumptionEan"]
-        return "{}_rt_consumption".format(_id)
+        return f"{_id}_rt_consumption"
diff --git a/homeassistant/components/time_date/sensor.py b/homeassistant/components/time_date/sensor.py
index 02cde06d763..cbe4c85ace3 100644
--- a/homeassistant/components/time_date/sensor.py
+++ b/homeassistant/components/time_date/sensor.py
@@ -118,15 +118,15 @@ class TimeDateSensor(Entity):
         elif self.type == "date":
             self._state = date
         elif self.type == "date_time":
-            self._state = "{}, {}".format(date, time)
+            self._state = f"{date}, {time}"
         elif self.type == "time_date":
-            self._state = "{}, {}".format(time, date)
+            self._state = f"{time}, {date}"
         elif self.type == "time_utc":
             self._state = time_utc
         elif self.type == "beat":
-            self._state = "@{0:03d}".format(beat)
+            self._state = f"@{beat:03d}"
         elif self.type == "date_time_iso":
-            self._state = dt_util.parse_datetime("{} {}".format(date, time)).isoformat()
+            self._state = dt_util.parse_datetime(f"{date} {time}").isoformat()
 
     @callback
     def point_in_time_listener(self, time_date):
diff --git a/homeassistant/components/tplink/device_tracker.py b/homeassistant/components/tplink/device_tracker.py
index 6f1d9761fdf..60d49573833 100644
--- a/homeassistant/components/tplink/device_tracker.py
+++ b/homeassistant/components/tplink/device_tracker.py
@@ -168,8 +168,8 @@ class Tplink1DeviceScanner(DeviceScanner):
         """
         _LOGGER.info("Loading wireless clients...")
 
-        url = "http://{}/userRpm/WlanStationRpm.htm".format(self.host)
-        referer = "http://{}".format(self.host)
+        url = f"http://{self.host}/userRpm/WlanStationRpm.htm"
+        referer = f"http://{self.host}"
         page = requests.get(
             url,
             auth=(self.username, self.password),
@@ -205,16 +205,16 @@ class Tplink2DeviceScanner(Tplink1DeviceScanner):
         """
         _LOGGER.info("Loading wireless clients...")
 
-        url = "http://{}/data/map_access_wireless_client_grid.json".format(self.host)
-        referer = "http://{}".format(self.host)
+        url = f"http://{self.host}/data/map_access_wireless_client_grid.json"
+        referer = f"http://{self.host}"
 
         # Router uses Authorization cookie instead of header
         # Let's create the cookie
-        username_password = "{}:{}".format(self.username, self.password)
+        username_password = f"{self.username}:{self.password}"
         b64_encoded_username_password = base64.b64encode(
             username_password.encode("ascii")
         ).decode("ascii")
-        cookie = "Authorization=Basic {}".format(b64_encoded_username_password)
+        cookie = f"Authorization=Basic {b64_encoded_username_password}"
 
         response = requests.post(
             url, headers={REFERER: referer, COOKIE: cookie}, timeout=4
@@ -264,8 +264,8 @@ class Tplink3DeviceScanner(Tplink1DeviceScanner):
         """Retrieve auth tokens from the router."""
         _LOGGER.info("Retrieving auth tokens...")
 
-        url = "http://{}/cgi-bin/luci/;stok=/login?form=login".format(self.host)
-        referer = "http://{}/webpages/login.html".format(self.host)
+        url = f"http://{self.host}/cgi-bin/luci/;stok=/login?form=login"
+        referer = f"http://{self.host}/webpages/login.html"
 
         # If possible implement RSA encryption of password here.
         response = requests.post(
@@ -303,7 +303,7 @@ class Tplink3DeviceScanner(Tplink1DeviceScanner):
         url = (
             "http://{}/cgi-bin/luci/;stok={}/admin/wireless?" "form=statistics"
         ).format(self.host, self.stok)
-        referer = "http://{}/webpages/index.html".format(self.host)
+        referer = f"http://{self.host}/webpages/index.html"
 
         response = requests.post(
             url,
@@ -346,7 +346,7 @@ class Tplink3DeviceScanner(Tplink1DeviceScanner):
         url = ("http://{}/cgi-bin/luci/;stok={}/admin/system?" "form=logout").format(
             self.host, self.stok
         )
-        referer = "http://{}/webpages/index.html".format(self.host)
+        referer = f"http://{self.host}/webpages/index.html"
 
         requests.post(
             url,
@@ -379,19 +379,19 @@ class Tplink4DeviceScanner(Tplink1DeviceScanner):
     def _get_auth_tokens(self):
         """Retrieve auth tokens from the router."""
         _LOGGER.info("Retrieving auth tokens...")
-        url = "http://{}/userRpm/LoginRpm.htm?Save=Save".format(self.host)
+        url = f"http://{self.host}/userRpm/LoginRpm.htm?Save=Save"
 
         # Generate md5 hash of password. The C7 appears to use the first 15
         # characters of the password only, so we truncate to remove additional
         # characters from being hashed.
         password = hashlib.md5(self.password.encode("utf")[:15]).hexdigest()
-        credentials = "{}:{}".format(self.username, password).encode("utf")
+        credentials = f"{self.username}:{password}".encode("utf")
 
         # Encode the credentials to be sent as a cookie.
         self.credentials = base64.b64encode(credentials).decode("utf")
 
         # Create the authorization cookie.
-        cookie = "Authorization=Basic {}".format(self.credentials)
+        cookie = f"Authorization=Basic {self.credentials}"
 
         response = requests.get(url, headers={COOKIE: cookie})
 
@@ -423,9 +423,9 @@ class Tplink4DeviceScanner(Tplink1DeviceScanner):
 
         # Check both the 2.4GHz and 5GHz client list URLs
         for clients_url in ("WlanStationRpm.htm", "WlanStationRpm_5g.htm"):
-            url = "http://{}/{}/userRpm/{}".format(self.host, self.token, clients_url)
-            referer = "http://{}".format(self.host)
-            cookie = "Authorization=Basic {}".format(self.credentials)
+            url = f"http://{self.host}/{self.token}/userRpm/{clients_url}"
+            referer = f"http://{self.host}"
+            cookie = f"Authorization=Basic {self.credentials}"
 
             page = requests.get(url, headers={COOKIE: cookie, REFERER: referer})
             mac_results.extend(self.parse_macs.findall(page.text))
@@ -456,7 +456,7 @@ class Tplink5DeviceScanner(Tplink1DeviceScanner):
         """
         _LOGGER.info("Loading wireless clients...")
 
-        base_url = "http://{}".format(self.host)
+        base_url = f"http://{self.host}"
 
         header = {
             USER_AGENT: "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12;"
@@ -466,7 +466,7 @@ class Tplink5DeviceScanner(Tplink1DeviceScanner):
             ACCEPT_ENCODING: "gzip, deflate",
             CONTENT_TYPE: "application/x-www-form-urlencoded; charset=UTF-8",
             HTTP_HEADER_X_REQUESTED_WITH: "XMLHttpRequest",
-            REFERER: "http://{}/".format(self.host),
+            REFERER: f"http://{self.host}/",
             CONNECTION: KEEP_ALIVE,
             PRAGMA: HTTP_HEADER_NO_CACHE,
             CACHE_CONTROL: HTTP_HEADER_NO_CACHE,
@@ -484,7 +484,7 @@ class Tplink5DeviceScanner(Tplink1DeviceScanner):
         # A timestamp is required to be sent as get parameter
         timestamp = int(datetime.now().timestamp() * 1e3)
 
-        client_list_url = "{}/data/monitor.client.client.json".format(base_url)
+        client_list_url = f"{base_url}/data/monitor.client.client.json"
 
         get_params = {"operation": "load", "_": timestamp}
 
diff --git a/homeassistant/components/traccar/__init__.py b/homeassistant/components/traccar/__init__.py
index 8e3f90fb66f..5eb87de0db2 100644
--- a/homeassistant/components/traccar/__init__.py
+++ b/homeassistant/components/traccar/__init__.py
@@ -24,7 +24,7 @@ from .const import (
 
 _LOGGER = logging.getLogger(__name__)
 
-TRACKER_UPDATE = "{}_tracker_update".format(DOMAIN)
+TRACKER_UPDATE = f"{DOMAIN}_tracker_update"
 
 
 DEFAULT_ACCURACY = 200
@@ -83,7 +83,7 @@ async def handle_webhook(hass, webhook_id, request):
         attrs,
     )
 
-    return web.Response(text="Setting location for {}".format(device), status=HTTP_OK)
+    return web.Response(text=f"Setting location for {device}", status=HTTP_OK)
 
 
 async def async_setup_entry(hass, entry):
diff --git a/homeassistant/components/tradfri/light.py b/homeassistant/components/tradfri/light.py
index 7992bf459db..97fdfd9d36d 100644
--- a/homeassistant/components/tradfri/light.py
+++ b/homeassistant/components/tradfri/light.py
@@ -57,7 +57,7 @@ class TradfriGroup(Light):
     def __init__(self, group, api, gateway_id):
         """Initialize a Group."""
         self._api = api
-        self._unique_id = "group-{}-{}".format(gateway_id, group.id)
+        self._unique_id = f"group-{gateway_id}-{group.id}"
         self._group = group
         self._name = group.name
 
@@ -152,7 +152,7 @@ class TradfriLight(Light):
     def __init__(self, light, api, gateway_id):
         """Initialize a Light."""
         self._api = api
-        self._unique_id = "light-{}-{}".format(gateway_id, light.id)
+        self._unique_id = f"light-{gateway_id}-{light.id}"
         self._light = None
         self._light_control = None
         self._light_data = None
diff --git a/homeassistant/components/tradfri/switch.py b/homeassistant/components/tradfri/switch.py
index 2b1bb0d5c54..4be72eb7359 100644
--- a/homeassistant/components/tradfri/switch.py
+++ b/homeassistant/components/tradfri/switch.py
@@ -34,7 +34,7 @@ class TradfriSwitch(SwitchDevice):
     def __init__(self, switch, api, gateway_id):
         """Initialize a switch."""
         self._api = api
-        self._unique_id = "{}-{}".format(gateway_id, switch.id)
+        self._unique_id = f"{gateway_id}-{switch.id}"
         self._switch = None
         self._socket_control = None
         self._switch_data = None
diff --git a/homeassistant/components/trafikverket_weatherstation/sensor.py b/homeassistant/components/trafikverket_weatherstation/sensor.py
index 9c79aa5cda6..cb80e8d441b 100644
--- a/homeassistant/components/trafikverket_weatherstation/sensor.py
+++ b/homeassistant/components/trafikverket_weatherstation/sensor.py
@@ -147,7 +147,7 @@ class TrafikverketWeatherStation(Entity):
     @property
     def name(self):
         """Return the name of the sensor."""
-        return "{} {}".format(self._client, self._name)
+        return f"{self._client} {self._name}"
 
     @property
     def icon(self):
diff --git a/homeassistant/components/transmission/sensor.py b/homeassistant/components/transmission/sensor.py
index 9e5397dd9fb..ac2e64ce92f 100644
--- a/homeassistant/components/transmission/sensor.py
+++ b/homeassistant/components/transmission/sensor.py
@@ -63,7 +63,7 @@ class TransmissionSensor(Entity):
     @property
     def name(self):
         """Return the name of the sensor."""
-        return "{} {}".format(self.client_name, self._name)
+        return f"{self.client_name} {self._name}"
 
     @property
     def state(self):
diff --git a/homeassistant/components/travisci/sensor.py b/homeassistant/components/travisci/sensor.py
index 546fe7606e7..b86b62fc1e9 100644
--- a/homeassistant/components/travisci/sensor.py
+++ b/homeassistant/components/travisci/sensor.py
@@ -84,7 +84,7 @@ def setup_platform(hass, config, add_entities, discovery_info=None):
 
     for repo in repositories:
         if "/" not in repo:
-            repo = "{0}/{1}".format(user.login, repo)
+            repo = f"{user.login}/{repo}"
 
         for sensor_type in config.get(CONF_MONITORED_CONDITIONS):
             sensors.append(TravisCISensor(travis, repo, user, branch, sensor_type))
diff --git a/homeassistant/components/twentemilieu/sensor.py b/homeassistant/components/twentemilieu/sensor.py
index 9dc109c98de..b1be9a071e4 100644
--- a/homeassistant/components/twentemilieu/sensor.py
+++ b/homeassistant/components/twentemilieu/sensor.py
@@ -40,28 +40,28 @@ async def async_setup_entry(
         TwenteMilieuSensor(
             twentemilieu,
             unique_id=entry.data[CONF_ID],
-            name="{} Waste Pickup".format(WASTE_TYPE_NON_RECYCLABLE),
+            name=f"{WASTE_TYPE_NON_RECYCLABLE} Waste Pickup",
             waste_type=WASTE_TYPE_NON_RECYCLABLE,
             icon="mdi:delete-empty",
         ),
         TwenteMilieuSensor(
             twentemilieu,
             unique_id=entry.data[CONF_ID],
-            name="{} Waste Pickup".format(WASTE_TYPE_ORGANIC),
+            name=f"{WASTE_TYPE_ORGANIC} Waste Pickup",
             waste_type=WASTE_TYPE_ORGANIC,
             icon="mdi:delete-empty",
         ),
         TwenteMilieuSensor(
             twentemilieu,
             unique_id=entry.data[CONF_ID],
-            name="{} Waste Pickup".format(WASTE_TYPE_PAPER),
+            name=f"{WASTE_TYPE_PAPER} Waste Pickup",
             waste_type=WASTE_TYPE_PAPER,
             icon="mdi:delete-empty",
         ),
         TwenteMilieuSensor(
             twentemilieu,
             unique_id=entry.data[CONF_ID],
-            name="{} Waste Pickup".format(WASTE_TYPE_PLASTIC),
+            name=f"{WASTE_TYPE_PLASTIC} Waste Pickup",
             waste_type=WASTE_TYPE_PLASTIC,
             icon="mdi:delete-empty",
         ),
@@ -110,7 +110,7 @@ class TwenteMilieuSensor(Entity):
     @property
     def unique_id(self) -> str:
         """Return the unique ID for this sensor."""
-        return "{}_{}_{}".format(DOMAIN, self._unique_id, self._waste_type)
+        return f"{DOMAIN}_{self._unique_id}_{self._waste_type}"
 
     @property
     def should_poll(self) -> bool:
diff --git a/homeassistant/components/twilio/__init__.py b/homeassistant/components/twilio/__init__.py
index 74264a31f06..ea5629e7cab 100644
--- a/homeassistant/components/twilio/__init__.py
+++ b/homeassistant/components/twilio/__init__.py
@@ -11,7 +11,7 @@ CONF_AUTH_TOKEN = "auth_token"
 
 DATA_TWILIO = DOMAIN
 
-RECEIVED_DATA = "{}_data_received".format(DOMAIN)
+RECEIVED_DATA = f"{DOMAIN}_data_received"
 
 CONFIG_SCHEMA = vol.Schema(
     {
diff --git a/homeassistant/components/ubus/device_tracker.py b/homeassistant/components/ubus/device_tracker.py
index 53cd900c0d4..f14ea5af02c 100644
--- a/homeassistant/components/ubus/device_tracker.py
+++ b/homeassistant/components/ubus/device_tracker.py
@@ -80,7 +80,7 @@ class UbusDeviceScanner(DeviceScanner):
 
         self.parse_api_pattern = re.compile(r"(?P<param>\w*) = (?P<value>.*);")
         self.last_results = {}
-        self.url = "http://{}/ubus".format(host)
+        self.url = f"http://{host}/ubus"
 
         self.session_id = _get_session_id(self.url, self.username, self.password)
         self.hostapd = []
diff --git a/homeassistant/components/uk_transport/sensor.py b/homeassistant/components/uk_transport/sensor.py
index 38183d23a0e..8e6e46531e2 100644
--- a/homeassistant/components/uk_transport/sensor.py
+++ b/homeassistant/components/uk_transport/sensor.py
@@ -157,10 +157,10 @@ class UkTransportLiveBusTimeSensor(UkTransportSensor):
         self._stop_atcocode = stop_atcocode
         self._bus_direction = bus_direction
         self._next_buses = []
-        self._destination_re = re.compile("{}".format(bus_direction), re.IGNORECASE)
+        self._destination_re = re.compile(f"{bus_direction}", re.IGNORECASE)
 
-        sensor_name = "Next bus to {}".format(bus_direction)
-        stop_url = "bus/stop/{}/live.json".format(stop_atcocode)
+        sensor_name = f"Next bus to {bus_direction}"
+        stop_url = f"bus/stop/{stop_atcocode}/live.json"
 
         UkTransportSensor.__init__(self, sensor_name, api_app_id, api_app_key, stop_url)
         self.update = Throttle(interval)(self._update)
@@ -220,8 +220,8 @@ class UkTransportLiveTrainTimeSensor(UkTransportSensor):
         self._calling_at = calling_at
         self._next_trains = []
 
-        sensor_name = "Next train to {}".format(calling_at)
-        query_url = "train/station/{}/live.json".format(station_code)
+        sensor_name = f"Next train to {calling_at}"
+        query_url = f"train/station/{station_code}/live.json"
 
         UkTransportSensor.__init__(
             self, sensor_name, api_app_id, api_app_key, query_url
diff --git a/homeassistant/components/unifi/device_tracker.py b/homeassistant/components/unifi/device_tracker.py
index 1f4aef754ad..ca6ddb68206 100644
--- a/homeassistant/components/unifi/device_tracker.py
+++ b/homeassistant/components/unifi/device_tracker.py
@@ -238,7 +238,7 @@ class UniFiClientTracker(ScannerEntity):
     @property
     def unique_id(self) -> str:
         """Return a unique identifier for this client."""
-        return "{}-{}".format(self.client.mac, self.controller.site)
+        return f"{self.client.mac}-{self.controller.site}"
 
     @property
     def available(self) -> bool:
diff --git a/homeassistant/components/unifi/switch.py b/homeassistant/components/unifi/switch.py
index f46a55f671e..4f757102d53 100644
--- a/homeassistant/components/unifi/switch.py
+++ b/homeassistant/components/unifi/switch.py
@@ -69,7 +69,7 @@ def update_items(controller, async_add_entities, switches, switches_off):
     # block client
     for client_id in controller.option_block_clients:
 
-        block_client_id = "block-{}".format(client_id)
+        block_client_id = f"block-{client_id}"
 
         if block_client_id in switches:
             LOGGER.debug(
@@ -91,7 +91,7 @@ def update_items(controller, async_add_entities, switches, switches_off):
     # control poe
     for client_id in controller.api.clients:
 
-        poe_client_id = "poe-{}".format(client_id)
+        poe_client_id = f"poe-{client_id}"
 
         if poe_client_id in switches:
             LOGGER.debug(
@@ -194,7 +194,7 @@ class UniFiPOEClientSwitch(UniFiClient, SwitchDevice, RestoreEntity):
     @property
     def unique_id(self):
         """Return a unique identifier for this switch."""
-        return "poe-{}".format(self.client.mac)
+        return f"poe-{self.client.mac}"
 
     @property
     def is_on(self):
@@ -255,7 +255,7 @@ class UniFiBlockClientSwitch(UniFiClient, SwitchDevice):
     @property
     def unique_id(self):
         """Return a unique identifier for this switch."""
-        return "block-{}".format(self.client.mac)
+        return f"block-{self.client.mac}"
 
     @property
     def is_on(self):
diff --git a/homeassistant/components/upc_connect/device_tracker.py b/homeassistant/components/upc_connect/device_tracker.py
index 3355c33ab2a..384b82d1395 100644
--- a/homeassistant/components/upc_connect/device_tracker.py
+++ b/homeassistant/components/upc_connect/device_tracker.py
@@ -48,7 +48,7 @@ class UPCDeviceScanner(DeviceScanner):
 
         self.headers = {
             HTTP_HEADER_X_REQUESTED_WITH: "XMLHttpRequest",
-            REFERER: "http://{}/index.html".format(self.host),
+            REFERER: f"http://{self.host}/index.html",
             USER_AGENT: (
                 "Mozilla/5.0 (Windows NT 10.0; WOW64) "
                 "AppleWebKit/537.36 (KHTML, like Gecko) "
@@ -88,8 +88,7 @@ class UPCDeviceScanner(DeviceScanner):
             # get first token
             with async_timeout.timeout(10):
                 response = await self.websession.get(
-                    "http://{}/common_page/login.html".format(self.host),
-                    headers=self.headers,
+                    f"http://{self.host}/common_page/login.html", headers=self.headers
                 )
 
                 await response.text()
@@ -109,8 +108,8 @@ class UPCDeviceScanner(DeviceScanner):
                 # The 'token' parameter has to be first, and 'fun' second
                 # or the UPC firmware will return an error
                 response = await self.websession.post(
-                    "http://{}/xml/getter.xml".format(self.host),
-                    data="token={}&fun={}".format(self.token, function),
+                    f"http://{self.host}/xml/getter.xml",
+                    data=f"token={self.token}&fun={function}",
                     headers=self.headers,
                     allow_redirects=False,
                 )
diff --git a/homeassistant/components/upnp/sensor.py b/homeassistant/components/upnp/sensor.py
index 33ffa4d478a..e5746e088f8 100644
--- a/homeassistant/components/upnp/sensor.py
+++ b/homeassistant/components/upnp/sensor.py
@@ -118,7 +118,7 @@ class RawUPnPIGDSensor(UpnpSensor):
     @property
     def unique_id(self) -> str:
         """Return an unique ID."""
-        return "{}_{}".format(self._device.udn, self._type_name)
+        return f"{self._device.udn}_{self._type_name}"
 
     @property
     def state(self) -> str:
@@ -172,12 +172,12 @@ class PerSecondUPnPIGDSensor(UpnpSensor):
     @property
     def unique_id(self) -> str:
         """Return an unique ID."""
-        return "{}_{}/sec_{}".format(self._device.udn, self.unit, self._direction)
+        return f"{self._device.udn}_{self.unit}/sec_{self._direction}"
 
     @property
     def name(self) -> str:
         """Return the name of the sensor."""
-        return "{} {}/sec {}".format(self._device.name, self.unit, self._direction)
+        return f"{self._device.name} {self.unit}/sec {self._direction}"
 
     @property
     def icon(self) -> str:
@@ -187,7 +187,7 @@ class PerSecondUPnPIGDSensor(UpnpSensor):
     @property
     def unit_of_measurement(self) -> str:
         """Return the unit of measurement of this entity, if any."""
-        return "{}/sec".format(self.unit)
+        return f"{self.unit}/sec"
 
     def _is_overflowed(self, new_value) -> bool:
         """Check if value has overflowed."""
diff --git a/homeassistant/components/usps/camera.py b/homeassistant/components/usps/camera.py
index 78af9c4feab..3141314b049 100644
--- a/homeassistant/components/usps/camera.py
+++ b/homeassistant/components/usps/camera.py
@@ -65,7 +65,7 @@ class USPSCamera(Camera):
     @property
     def name(self):
         """Return the name of this camera."""
-        return "{} mail".format(self._name)
+        return f"{self._name} mail"
 
     @property
     def model(self):
diff --git a/homeassistant/components/usps/sensor.py b/homeassistant/components/usps/sensor.py
index a8aa6f6cc6f..7e26e6c9e5c 100644
--- a/homeassistant/components/usps/sensor.py
+++ b/homeassistant/components/usps/sensor.py
@@ -36,7 +36,7 @@ class USPSPackageSensor(Entity):
     @property
     def name(self):
         """Return the name of the sensor."""
-        return "{} packages".format(self._name)
+        return f"{self._name} packages"
 
     @property
     def state(self):
@@ -85,7 +85,7 @@ class USPSMailSensor(Entity):
     @property
     def name(self):
         """Return the name of the sensor."""
-        return "{} mail".format(self._name)
+        return f"{self._name} mail"
 
     @property
     def state(self):
diff --git a/homeassistant/components/vallox/__init__.py b/homeassistant/components/vallox/__init__.py
index 40ae0a83482..c107e4f8894 100644
--- a/homeassistant/components/vallox/__init__.py
+++ b/homeassistant/components/vallox/__init__.py
@@ -152,7 +152,7 @@ class ValloxStateProxy:
             raise OSError("Device state out of sync.")
 
         if metric_key not in vlxDevConstants.__dict__:
-            raise KeyError("Unknown metric key: {}".format(metric_key))
+            raise KeyError(f"Unknown metric key: {metric_key}")
 
         return self._metric_cache[metric_key]
 
diff --git a/homeassistant/components/vallox/sensor.py b/homeassistant/components/vallox/sensor.py
index 705ccd3103d..f7be502cecb 100644
--- a/homeassistant/components/vallox/sensor.py
+++ b/homeassistant/components/vallox/sensor.py
@@ -28,14 +28,14 @@ async def async_setup_platform(hass, config, async_add_entities, discovery_info=
 
     sensors = [
         ValloxProfileSensor(
-            name="{} Current Profile".format(name),
+            name=f"{name} Current Profile",
             state_proxy=state_proxy,
             device_class=None,
             unit_of_measurement=None,
             icon="mdi:gauge",
         ),
         ValloxFanSpeedSensor(
-            name="{} Fan Speed".format(name),
+            name=f"{name} Fan Speed",
             state_proxy=state_proxy,
             metric_key="A_CYC_FAN_SPEED",
             device_class=None,
@@ -43,7 +43,7 @@ async def async_setup_platform(hass, config, async_add_entities, discovery_info=
             icon="mdi:fan",
         ),
         ValloxSensor(
-            name="{} Extract Air".format(name),
+            name=f"{name} Extract Air",
             state_proxy=state_proxy,
             metric_key="A_CYC_TEMP_EXTRACT_AIR",
             device_class=DEVICE_CLASS_TEMPERATURE,
@@ -51,7 +51,7 @@ async def async_setup_platform(hass, config, async_add_entities, discovery_info=
             icon=None,
         ),
         ValloxSensor(
-            name="{} Exhaust Air".format(name),
+            name=f"{name} Exhaust Air",
             state_proxy=state_proxy,
             metric_key="A_CYC_TEMP_EXHAUST_AIR",
             device_class=DEVICE_CLASS_TEMPERATURE,
@@ -59,7 +59,7 @@ async def async_setup_platform(hass, config, async_add_entities, discovery_info=
             icon=None,
         ),
         ValloxSensor(
-            name="{} Outdoor Air".format(name),
+            name=f"{name} Outdoor Air",
             state_proxy=state_proxy,
             metric_key="A_CYC_TEMP_OUTDOOR_AIR",
             device_class=DEVICE_CLASS_TEMPERATURE,
@@ -67,7 +67,7 @@ async def async_setup_platform(hass, config, async_add_entities, discovery_info=
             icon=None,
         ),
         ValloxSensor(
-            name="{} Supply Air".format(name),
+            name=f"{name} Supply Air",
             state_proxy=state_proxy,
             metric_key="A_CYC_TEMP_SUPPLY_AIR",
             device_class=DEVICE_CLASS_TEMPERATURE,
@@ -75,7 +75,7 @@ async def async_setup_platform(hass, config, async_add_entities, discovery_info=
             icon=None,
         ),
         ValloxSensor(
-            name="{} Humidity".format(name),
+            name=f"{name} Humidity",
             state_proxy=state_proxy,
             metric_key="A_CYC_RH_VALUE",
             device_class=DEVICE_CLASS_HUMIDITY,
@@ -83,7 +83,7 @@ async def async_setup_platform(hass, config, async_add_entities, discovery_info=
             icon=None,
         ),
         ValloxFilterRemainingSensor(
-            name="{} Remaining Time For Filter".format(name),
+            name=f"{name} Remaining Time For Filter",
             state_proxy=state_proxy,
             metric_key="A_CYC_REMAINING_TIME_FOR_FILTER",
             device_class=DEVICE_CLASS_TIMESTAMP,
diff --git a/homeassistant/components/velbus/__init__.py b/homeassistant/components/velbus/__init__.py
index 76018dcf548..9946f06446f 100644
--- a/homeassistant/components/velbus/__init__.py
+++ b/homeassistant/components/velbus/__init__.py
@@ -119,7 +119,7 @@ class VelbusEntity(Entity):
             serial = self._module.get_module_address()
         else:
             serial = self._module.serial
-        return "{}-{}".format(serial, self._channel)
+        return f"{serial}-{self._channel}"
 
     @property
     def name(self):
diff --git a/homeassistant/components/volumio/media_player.py b/homeassistant/components/volumio/media_player.py
index 96e1d883646..8bd1952a650 100644
--- a/homeassistant/components/volumio/media_player.py
+++ b/homeassistant/components/volumio/media_player.py
@@ -125,7 +125,7 @@ class Volumio(MediaPlayerDevice):
 
     async def send_volumio_msg(self, method, params=None):
         """Send message."""
-        url = "http://{}:{}/api/v1/{}/".format(self.host, self.port, method)
+        url = f"http://{self.host}:{self.port}/api/v1/{method}/"
 
         _LOGGER.debug("URL: %s params: %s", url, params)
 
@@ -202,7 +202,7 @@ class Volumio(MediaPlayerDevice):
         if str(url[0:2]).lower() == "ht":
             mediaurl = url
         else:
-            mediaurl = "http://{}:{}{}".format(self.host, self.port, url)
+            mediaurl = f"http://{self.host}:{self.port}{url}"
         return mediaurl
 
     @property
diff --git a/homeassistant/components/volvooncall/__init__.py b/homeassistant/components/volvooncall/__init__.py
index b007628dbd8..c41c72020c4 100644
--- a/homeassistant/components/volvooncall/__init__.py
+++ b/homeassistant/components/volvooncall/__init__.py
@@ -36,7 +36,7 @@ CONF_SERVICE_URL = "service_url"
 CONF_SCANDINAVIAN_MILES = "scandinavian_miles"
 CONF_MUTABLE = "mutable"
 
-SIGNAL_STATE_UPDATED = "{}.updated".format(DOMAIN)
+SIGNAL_STATE_UPDATED = f"{DOMAIN}.updated"
 
 COMPONENTS = {
     "sensor": "sensor",
@@ -261,7 +261,7 @@ class VolvoEntity(Entity):
     @property
     def name(self):
         """Return full name of the entity."""
-        return "{} {}".format(self._vehicle_name, self._entity_name)
+        return f"{self._vehicle_name} {self._entity_name}"
 
     @property
     def should_poll(self):
@@ -278,5 +278,5 @@ class VolvoEntity(Entity):
         """Return device specific state attributes."""
         return dict(
             self.instrument.attributes,
-            model="{}/{}".format(self.vehicle.vehicle_type, self.vehicle.model_year),
+            model=f"{self.vehicle.vehicle_type}/{self.vehicle.model_year}",
         )
diff --git a/homeassistant/components/waqi/sensor.py b/homeassistant/components/waqi/sensor.py
index a2b9e69e002..dbfe6de1a60 100644
--- a/homeassistant/components/waqi/sensor.py
+++ b/homeassistant/components/waqi/sensor.py
@@ -113,7 +113,7 @@ class WaqiSensor(Entity):
     def name(self):
         """Return the name of the sensor."""
         if self.station_name:
-            return "WAQI {}".format(self.station_name)
+            return f"WAQI {self.station_name}"
         return "WAQI {}".format(self.url if self.url else self.uid)
 
     @property
diff --git a/homeassistant/components/watson_iot/__init__.py b/homeassistant/components/watson_iot/__init__.py
index 54c11506b29..aef2cc8ccce 100644
--- a/homeassistant/components/watson_iot/__init__.py
+++ b/homeassistant/components/watson_iot/__init__.py
@@ -126,7 +126,7 @@ def setup(hass, config):
             if key != "unit_of_measurement":
                 # If the key is already in fields
                 if key in out_event["fields"]:
-                    key = "{}_".format(key)
+                    key = f"{key}_"
                 # For each value we try to cast it as float
                 # But if we can not do it we store the value
                 # as string
diff --git a/homeassistant/components/waze_travel_time/sensor.py b/homeassistant/components/waze_travel_time/sensor.py
index 3fc44f90d42..340c0adbc97 100644
--- a/homeassistant/components/waze_travel_time/sensor.py
+++ b/homeassistant/components/waze_travel_time/sensor.py
@@ -175,7 +175,7 @@ class WazeTravelTime(Entity):
             return _get_location_from_attributes(state)
 
         # Check if device is inside a zone.
-        zone_state = self.hass.states.get("zone.{}".format(state.state))
+        zone_state = self.hass.states.get(f"zone.{state.state}")
         if location.has_location(zone_state):
             _LOGGER.debug(
                 "%s is in %s, getting zone location", entity_id, zone_state.entity_id
diff --git a/homeassistant/components/wemo/__init__.py b/homeassistant/components/wemo/__init__.py
index 3cdc5afd4a0..9e479991d15 100644
--- a/homeassistant/components/wemo/__init__.py
+++ b/homeassistant/components/wemo/__init__.py
@@ -108,7 +108,7 @@ async def async_setup_entry(hass, entry):
 
     def setup_url_for_device(device):
         """Determine setup.xml url for given device."""
-        return "http://{}:{}/setup.xml".format(device.host, device.port)
+        return f"http://{device.host}:{device.port}/setup.xml"
 
     def setup_url_for_address(host, port):
         """Determine setup.xml url for given host and port pair."""
@@ -118,7 +118,7 @@ async def async_setup_entry(hass, entry):
         if not port:
             return None
 
-        return "http://{}:{}/setup.xml".format(host, port)
+        return f"http://{host}:{port}/setup.xml"
 
     def discovery_dispatch(service, discovery_info):
         """Dispatcher for incoming WeMo discovery events."""
@@ -150,7 +150,7 @@ async def async_setup_entry(hass, entry):
             if not url:
                 _LOGGER.error(
                     "Unable to get description url for WeMo at: %s",
-                    "{}:{}".format(host, port) if port else host,
+                    f"{host}:{port}" if port else host,
                 )
                 continue
 
diff --git a/homeassistant/components/wink/__init__.py b/homeassistant/components/wink/__init__.py
index 710adfd734d..5af784359d8 100644
--- a/homeassistant/components/wink/__init__.py
+++ b/homeassistant/components/wink/__init__.py
@@ -52,7 +52,7 @@ ATTR_HUB_NAME = "hub_name"
 WINK_AUTH_CALLBACK_PATH = "/auth/wink/callback"
 WINK_AUTH_START = "/auth/wink"
 WINK_CONFIG_FILE = ".wink.conf"
-USER_AGENT = "Manufacturer/Home-Assistant{} python/3 Wink/3".format(__version__)
+USER_AGENT = f"Manufacturer/Home-Assistant{__version__} python/3 Wink/3"
 
 DEFAULT_CONFIG = {"client_id": "CLIENT_ID_HERE", "client_secret": "CLIENT_SECRET_HERE"}
 
@@ -228,7 +228,7 @@ def _request_app_setup(hass, config):
         _configurator = hass.data[DOMAIN]["configuring"][DOMAIN]
         configurator.notify_errors(_configurator, error_msg)
 
-    start_url = "{}{}".format(hass.config.api.base_url, WINK_AUTH_CALLBACK_PATH)
+    start_url = f"{hass.config.api.base_url}{WINK_AUTH_CALLBACK_PATH}"
 
     description = """Please create a Wink developer app at
                      https://developer.wink.com.
@@ -268,9 +268,9 @@ def _request_oauth_completion(hass, config):
         """Call setup again."""
         setup(hass, config)
 
-    start_url = "{}{}".format(hass.config.api.base_url, WINK_AUTH_START)
+    start_url = f"{hass.config.api.base_url}{WINK_AUTH_START}"
 
-    description = "Please authorize Wink by visiting {}".format(start_url)
+    description = f"Please authorize Wink by visiting {start_url}"
 
     hass.data[DOMAIN]["configuring"][DOMAIN] = configurator.request_config(
         DOMAIN, wink_configuration_callback, description=description
diff --git a/homeassistant/components/wink/binary_sensor.py b/homeassistant/components/wink/binary_sensor.py
index ad1800b4223..e82a767fde8 100644
--- a/homeassistant/components/wink/binary_sensor.py
+++ b/homeassistant/components/wink/binary_sensor.py
@@ -140,7 +140,7 @@ class WinkHub(WinkBinarySensorDevice):
             # The service call to set the Kidde code
             # takes a string of 1s and 0s so it makes
             # sense to display it to the user that way
-            _formatted_kidde_code = "{:b}".format(_kidde_code).zfill(8)
+            _formatted_kidde_code = f"{_kidde_code:b}".zfill(8)
             _attributes["kidde_radio_code"] = _formatted_kidde_code
         return _attributes
 
diff --git a/homeassistant/components/wirelesstag/__init__.py b/homeassistant/components/wirelesstag/__init__.py
index 331b88894de..5e0da881076 100644
--- a/homeassistant/components/wirelesstag/__init__.py
+++ b/homeassistant/components/wirelesstag/__init__.py
@@ -74,14 +74,14 @@ class WirelessTagPlatform:
 
     def arm(self, switch):
         """Arm entity sensor monitoring."""
-        func_name = "arm_{}".format(switch.sensor_type)
+        func_name = f"arm_{switch.sensor_type}"
         arm_func = getattr(self.api, func_name)
         if arm_func is not None:
             arm_func(switch.tag_id, switch.tag_manager_mac)
 
     def disarm(self, switch):
         """Disarm entity sensor monitoring."""
-        func_name = "disarm_{}".format(switch.sensor_type)
+        func_name = f"disarm_{switch.sensor_type}"
         disarm_func = getattr(self.api, func_name)
         if disarm_func is not None:
             disarm_func(switch.tag_id, switch.tag_manager_mac)
@@ -132,18 +132,18 @@ class WirelessTagPlatform:
 
             port = self.hass.config.api.port
             if port is not None:
-                self._local_base_url += ":{}".format(port)
+                self._local_base_url += f":{port}"
         return self._local_base_url
 
     @property
     def update_callback_url(self):
         """Return url for local push notifications(update event)."""
-        return "{}/api/events/wirelesstag_update_tags".format(self.local_base_url)
+        return f"{self.local_base_url}/api/events/wirelesstag_update_tags"
 
     @property
     def binary_event_callback_url(self):
         """Return url for local push notifications(binary event)."""
-        return "{}/api/events/wirelesstag_binary_event".format(self.local_base_url)
+        return f"{self.local_base_url}/api/events/wirelesstag_binary_event"
 
     def handle_update_tags_event(self, event):
         """Handle push event from wireless tag manager."""
@@ -254,7 +254,7 @@ class WirelessTagBaseSensor(Entity):
     # pylint: disable=no-self-use
     def decorate_value(self, value):
         """Decorate input value to be well presented for end user."""
-        return "{:.1f}".format(value)
+        return f"{value:.1f}"
 
     @property
     def available(self):
@@ -280,8 +280,8 @@ class WirelessTagBaseSensor(Entity):
         """Return the state attributes."""
         return {
             ATTR_BATTERY_LEVEL: int(self._tag.battery_remaining * 100),
-            ATTR_VOLTAGE: "{:.2f}V".format(self._tag.battery_volts),
-            ATTR_TAG_SIGNAL_STRENGTH: "{}dBm".format(self._tag.signal_strength),
+            ATTR_VOLTAGE: f"{self._tag.battery_volts:.2f}V",
+            ATTR_TAG_SIGNAL_STRENGTH: f"{self._tag.signal_strength}dBm",
             ATTR_TAG_OUT_OF_RANGE: not self._tag.is_in_range,
-            ATTR_TAG_POWER_CONSUMPTION: "{:.2f}%".format(self._tag.power_consumption),
+            ATTR_TAG_POWER_CONSUMPTION: f"{self._tag.power_consumption:.2f}%",
         }
diff --git a/homeassistant/components/wirelesstag/binary_sensor.py b/homeassistant/components/wirelesstag/binary_sensor.py
index 72b68a8762f..4fcebe73478 100644
--- a/homeassistant/components/wirelesstag/binary_sensor.py
+++ b/homeassistant/components/wirelesstag/binary_sensor.py
@@ -95,7 +95,7 @@ class WirelessTagBinarySensor(WirelessTagBaseSensor, BinarySensorDevice):
         """Initialize a binary sensor for a Wireless Sensor Tags."""
         super().__init__(api, tag)
         self._sensor_type = sensor_type
-        self._name = "{0} {1}".format(self._tag.name, self.event.human_readable_name)
+        self._name = f"{self._tag.name} {self.event.human_readable_name}"
 
     async def async_added_to_hass(self):
         """Register callbacks."""
diff --git a/homeassistant/components/wirelesstag/switch.py b/homeassistant/components/wirelesstag/switch.py
index 37f97e3a1e6..1bc806d9e32 100644
--- a/homeassistant/components/wirelesstag/switch.py
+++ b/homeassistant/components/wirelesstag/switch.py
@@ -79,5 +79,5 @@ class WirelessTagSwitch(WirelessTagBaseSensor, SwitchDevice):
     @property
     def principal_value(self):
         """Provide actual value of switch."""
-        attr_name = "is_{}_sensor_armed".format(self.sensor_type)
+        attr_name = f"is_{self.sensor_type}_sensor_armed"
         return getattr(self._tag, attr_name, False)
diff --git a/homeassistant/components/withings/sensor.py b/homeassistant/components/withings/sensor.py
index 3328808295f..67cf966c1bc 100644
--- a/homeassistant/components/withings/sensor.py
+++ b/homeassistant/components/withings/sensor.py
@@ -325,7 +325,7 @@ class WithingsHealthSensor(Entity):
     @property
     def name(self) -> str:
         """Return the name of the sensor."""
-        return "Withings {} {}".format(self._attribute.measurement, self._slug)
+        return f"Withings {self._attribute.measurement} {self._slug}"
 
     @property
     def unique_id(self) -> str:
diff --git a/homeassistant/components/worldtidesinfo/sensor.py b/homeassistant/components/worldtidesinfo/sensor.py
index bd20431d706..aaa9f2d1585 100644
--- a/homeassistant/components/worldtidesinfo/sensor.py
+++ b/homeassistant/components/worldtidesinfo/sensor.py
@@ -96,12 +96,12 @@ class WorldTidesInfoSensor(Entity):
                 tidetime = time.strftime(
                     "%I:%M %p", time.localtime(self.data["extremes"][0]["dt"])
                 )
-                return "High tide at {}".format(tidetime)
+                return f"High tide at {tidetime}"
             if "Low" in str(self.data["extremes"][0]["type"]):
                 tidetime = time.strftime(
                     "%I:%M %p", time.localtime(self.data["extremes"][0]["dt"])
                 )
-                return "Low tide at {}".format(tidetime)
+                return f"Low tide at {tidetime}"
             return None
         return None
 
diff --git a/homeassistant/components/worxlandroid/sensor.py b/homeassistant/components/worxlandroid/sensor.py
index 69e2813e7d1..4e9bf0a6a4a 100644
--- a/homeassistant/components/worxlandroid/sensor.py
+++ b/homeassistant/components/worxlandroid/sensor.py
@@ -63,12 +63,12 @@ class WorxLandroidSensor(Entity):
         self.pin = config.get(CONF_PIN)
         self.timeout = config.get(CONF_TIMEOUT)
         self.allow_unreachable = config.get(CONF_ALLOW_UNREACHABLE)
-        self.url = "http://{}/jsondata.cgi".format(self.host)
+        self.url = f"http://{self.host}/jsondata.cgi"
 
     @property
     def name(self):
         """Return the name of the sensor."""
-        return "worxlandroid-{}".format(self.sensor)
+        return f"worxlandroid-{self.sensor}"
 
     @property
     def state(self):
diff --git a/homeassistant/components/wunderground/sensor.py b/homeassistant/components/wunderground/sensor.py
index 21f87d9ce0b..5272b33ccb5 100644
--- a/homeassistant/components/wunderground/sensor.py
+++ b/homeassistant/components/wunderground/sensor.py
@@ -968,7 +968,7 @@ async def async_setup_platform(
     )
 
     if pws_id is None:
-        unique_id_base = "@{:06f},{:06f}".format(longitude, latitude)
+        unique_id_base = f"@{longitude:06f},{latitude:06f}"
     else:
         # Manually specified weather station, use that for unique_id
         unique_id_base = pws_id
@@ -999,7 +999,7 @@ class WUndergroundSensor(Entity):
         # This is only the suggested entity id, it might get changed by
         # the entity registry later.
         self.entity_id = sensor.ENTITY_ID_FORMAT.format("pws_" + condition)
-        self._unique_id = "{},{}".format(unique_id_base, condition)
+        self._unique_id = f"{unique_id_base},{condition}"
         self._device_class = self._cfg_expand("device_class")
 
     def _cfg_expand(self, what, default=None):
@@ -1106,7 +1106,7 @@ class WUndergroundData:
         self._hass = hass
         self._api_key = api_key
         self._pws_id = pws_id
-        self._lang = "lang:{}".format(lang)
+        self._lang = f"lang:{lang}"
         self._latitude = latitude
         self._longitude = longitude
         self._features = set()
@@ -1122,9 +1122,9 @@ class WUndergroundData:
             self._api_key, "/".join(sorted(self._features)), self._lang
         )
         if self._pws_id:
-            url = url + "pws:{}".format(self._pws_id)
+            url = url + f"pws:{self._pws_id}"
         else:
-            url = url + "{},{}".format(self._latitude, self._longitude)
+            url = url + f"{self._latitude},{self._longitude}"
 
         return url + ".json"
 
diff --git a/homeassistant/components/wwlln/__init__.py b/homeassistant/components/wwlln/__init__.py
index ca3711490e7..412efc904db 100644
--- a/homeassistant/components/wwlln/__init__.py
+++ b/homeassistant/components/wwlln/__init__.py
@@ -47,7 +47,7 @@ async def async_setup(hass, config):
     latitude = conf.get(CONF_LATITUDE, hass.config.latitude)
     longitude = conf.get(CONF_LONGITUDE, hass.config.longitude)
 
-    identifier = "{0}, {1}".format(latitude, longitude)
+    identifier = f"{latitude}, {longitude}"
     if identifier in configured_instances(hass):
         return True