diff --git a/homeassistant/components/bayesian/binary_sensor.py b/homeassistant/components/bayesian/binary_sensor.py
index c4150131901..bd0fa797fd0 100644
--- a/homeassistant/components/bayesian/binary_sensor.py
+++ b/homeassistant/components/bayesian/binary_sensor.py
@@ -91,8 +91,7 @@ def update_probability(prior, prob_given_true, prob_given_false):
     """Update probability using Bayes' rule."""
     numerator = prob_given_true * prior
     denominator = numerator + prob_given_false * (1 - prior)
-    probability = numerator / denominator
-    return probability
+    return numerator / denominator
 
 
 async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
@@ -246,7 +245,7 @@ class BayesianBinarySensor(BinarySensorEntity):
         """Return True if numeric condition is met."""
         entity = entity_observation["entity_id"]
 
-        should_trigger = condition.async_numeric_state(
+        return condition.async_numeric_state(
             self.hass,
             entity,
             entity_observation.get("below"),
@@ -254,26 +253,18 @@ class BayesianBinarySensor(BinarySensorEntity):
             None,
             entity_observation,
         )
-        return should_trigger
 
     def _process_state(self, entity_observation):
         """Return True if state conditions are met."""
         entity = entity_observation["entity_id"]
 
-        should_trigger = condition.state(
-            self.hass, entity, entity_observation.get("to_state")
-        )
-
-        return should_trigger
+        return condition.state(self.hass, entity, entity_observation.get("to_state"))
 
     def _process_template(self, entity_observation):
         """Return True if template condition is True."""
         template = entity_observation.get(CONF_VALUE_TEMPLATE)
         template.hass = self.hass
-        should_trigger = condition.async_template(
-            self.hass, template, entity_observation
-        )
-        return should_trigger
+        return condition.async_template(self.hass, template, entity_observation)
 
     @property
     def name(self):
@@ -299,9 +290,9 @@ class BayesianBinarySensor(BinarySensorEntity):
     def device_state_attributes(self):
         """Return the state attributes of the sensor."""
 
-        attr_observations_list = list(
+        attr_observations_list = [
             obs.copy() for obs in self.current_observations.values() if obs is not None
-        )
+        ]
 
         for item in attr_observations_list:
             item.pop("value_template", None)
diff --git a/homeassistant/components/blebox/__init__.py b/homeassistant/components/blebox/__init__.py
index dcdd4c7f1e4..37b5569beb5 100644
--- a/homeassistant/components/blebox/__init__.py
+++ b/homeassistant/components/blebox/__init__.py
@@ -77,10 +77,7 @@ async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry):
 def create_blebox_entities(product, async_add, entity_klass, entity_type):
     """Create entities from a BleBox product's features."""
 
-    entities = []
-    for feature in product.features[entity_type]:
-        entities.append(entity_klass(feature))
-
+    entities = [entity_klass(feature) for feature in product.features[entity_type]]
     async_add(entities, True)
 
 
diff --git a/homeassistant/components/demo/climate.py b/homeassistant/components/demo/climate.py
index 9733d0f1147..fd5615c82bd 100644
--- a/homeassistant/components/demo/climate.py
+++ b/homeassistant/components/demo/climate.py
@@ -134,8 +134,6 @@ class DemoClimate(ClimateEntity):
             self._support_flags = self._support_flags | SUPPORT_TARGET_HUMIDITY
         if swing_mode is not None:
             self._support_flags = self._support_flags | SUPPORT_SWING_MODE
-        if hvac_action is not None:
-            self._support_flags = self._support_flags
         if aux is not None:
             self._support_flags = self._support_flags | SUPPORT_AUX_HEAT
         if HVAC_MODE_HEAT_COOL in hvac_modes or HVAC_MODE_AUTO in hvac_modes:
diff --git a/homeassistant/components/ecobee/climate.py b/homeassistant/components/ecobee/climate.py
index c956308ab8e..a65029fa4cd 100644
--- a/homeassistant/components/ecobee/climate.py
+++ b/homeassistant/components/ecobee/climate.py
@@ -288,7 +288,7 @@ class Thermostat(ClimateEntity):
         else:
             await self.data.update()
         self.thermostat = self.data.ecobee.get_thermostat(self.thermostat_index)
-        if self.hvac_mode is not HVAC_MODE_OFF:
+        if self.hvac_mode != HVAC_MODE_OFF:
             self._last_active_hvac_mode = self.hvac_mode
 
     @property
diff --git a/homeassistant/components/google_assistant/__init__.py b/homeassistant/components/google_assistant/__init__.py
index 2d848101def..160ec024c81 100644
--- a/homeassistant/components/google_assistant/__init__.py
+++ b/homeassistant/components/google_assistant/__init__.py
@@ -55,11 +55,8 @@ GOOGLE_SERVICE_ACCOUNT = vol.Schema(
 
 
 def _check_report_state(data):
-    if data[CONF_REPORT_STATE]:
-        if CONF_SERVICE_ACCOUNT not in data:
-            raise vol.Invalid(
-                "If report state is enabled, a service account must exist"
-            )
+    if data[CONF_REPORT_STATE] and CONF_SERVICE_ACCOUNT not in data:
+        raise vol.Invalid("If report state is enabled, a service account must exist")
     return data
 
 
diff --git a/homeassistant/components/horizon/media_player.py b/homeassistant/components/horizon/media_player.py
index 79a94538b70..0ed98f73a38 100644
--- a/homeassistant/components/horizon/media_player.py
+++ b/homeassistant/components/horizon/media_player.py
@@ -116,12 +116,12 @@ class HorizonDevice(MediaPlayerEntity):
 
     def turn_on(self):
         """Turn the device on."""
-        if self._state is STATE_OFF:
+        if self._state == STATE_OFF:
             self._send_key(self._keys.POWER)
 
     def turn_off(self):
         """Turn the device off."""
-        if self._state is not STATE_OFF:
+        if self._state != STATE_OFF:
             self._send_key(self._keys.POWER)
 
     def media_previous_track(self):
diff --git a/homeassistant/components/maxcube/climate.py b/homeassistant/components/maxcube/climate.py
index ccfd44af4f7..69d9177da5d 100644
--- a/homeassistant/components/maxcube/climate.py
+++ b/homeassistant/components/maxcube/climate.py
@@ -144,14 +144,11 @@ class MaxCubeClimate(ClimateEntity):
         """Set new target hvac mode."""
         device = self._cubehandle.cube.device_by_rf(self._rf_address)
         temp = device.target_temperature
-        mode = device.mode
+        mode = MAX_DEVICE_MODE_MANUAL
 
         if hvac_mode == HVAC_MODE_OFF:
             temp = OFF_TEMPERATURE
-            mode = MAX_DEVICE_MODE_MANUAL
-        elif hvac_mode == HVAC_MODE_HEAT:
-            mode = MAX_DEVICE_MODE_MANUAL
-        else:
+        elif hvac_mode != HVAC_MODE_HEAT:
             # Reset the temperature to a sane value.
             # Ideally, we should send 0 and the device will set its
             # temperature according to the schedule. However, current
diff --git a/homeassistant/components/modbus/sensor.py b/homeassistant/components/modbus/sensor.py
index 64fbc466b1c..8bf5f6f3115 100644
--- a/homeassistant/components/modbus/sensor.py
+++ b/homeassistant/components/modbus/sensor.py
@@ -99,9 +99,11 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
 def setup_platform(hass, config, add_entities, discovery_info=None):
     """Set up the Modbus sensors."""
     sensors = []
-    data_types = {DATA_TYPE_INT: {1: "h", 2: "i", 4: "q"}}
-    data_types[DATA_TYPE_UINT] = {1: "H", 2: "I", 4: "Q"}
-    data_types[DATA_TYPE_FLOAT] = {1: "e", 2: "f", 4: "d"}
+    data_types = {
+        DATA_TYPE_INT: {1: "h", 2: "i", 4: "q"},
+        DATA_TYPE_UINT: {1: "H", 2: "I", 4: "Q"},
+        DATA_TYPE_FLOAT: {1: "e", 2: "f", 4: "d"},
+    }
 
     for register in config[CONF_REGISTERS]:
         structure = ">i"
diff --git a/homeassistant/components/modbus/switch.py b/homeassistant/components/modbus/switch.py
index 0d5a32c45e0..8037d926ef1 100644
--- a/homeassistant/components/modbus/switch.py
+++ b/homeassistant/components/modbus/switch.py
@@ -170,10 +170,8 @@ class ModbusCoilSwitch(ToggleEntity, RestoreEntity):
             self._available = False
             return
 
-        value = bool(result.bits[0])
         self._available = True
-
-        return value
+        return bool(result.bits[0])
 
     def _write_coil(self, coil, value):
         """Write coil using the Modbus hub slave."""
@@ -288,10 +286,9 @@ class ModbusRegisterSwitch(ModbusCoilSwitch):
             self._available = False
             return
 
-        value = int(result.registers[0])
         self._available = True
 
-        return value
+        return int(result.registers[0])
 
     def _write_register(self, value):
         """Write holding register using the Modbus hub slave."""
diff --git a/homeassistant/components/sonos/media_player.py b/homeassistant/components/sonos/media_player.py
index 6565be0c5c9..b4dc9530b90 100644
--- a/homeassistant/components/sonos/media_player.py
+++ b/homeassistant/components/sonos/media_player.py
@@ -325,9 +325,7 @@ def soco_error(errorcodes=None):
             try:
                 return funct(*args, **kwargs)
             except SoCoUPnPException as err:
-                if errorcodes and err.error_code in errorcodes:
-                    pass
-                else:
+                if not errorcodes or err.error_code not in errorcodes:
                     _LOGGER.error("Error on %s with %s", funct.__name__, err)
             except SoCoException as err:
                 _LOGGER.error("Error on %s with %s", funct.__name__, err)
@@ -605,7 +603,6 @@ class SonosEntity(MediaPlayerEntity):
                     variables = event and event.variables
                     self.update_media_radio(variables, track_info)
                 else:
-                    variables = event and event.variables
                     self.update_media_music(update_position, track_info)
 
         self.schedule_update_ha_state()
diff --git a/homeassistant/components/tts/__init__.py b/homeassistant/components/tts/__init__.py
index 4569816eb7d..9a33c0514d5 100644
--- a/homeassistant/components/tts/__init__.py
+++ b/homeassistant/components/tts/__init__.py
@@ -438,9 +438,8 @@ class SpeechManager:
         album = provider.name
         artist = language
 
-        if options is not None:
-            if options.get("voice") is not None:
-                artist = options.get("voice")
+        if options is not None and options.get("voice") is not None:
+            artist = options.get("voice")
 
         try:
             tts_file = mutagen.File(data_bytes, easy=True)
diff --git a/homeassistant/components/volumio/media_player.py b/homeassistant/components/volumio/media_player.py
index 8d50f56bd65..82114cda68b 100644
--- a/homeassistant/components/volumio/media_player.py
+++ b/homeassistant/components/volumio/media_player.py
@@ -144,11 +144,7 @@ class Volumio(MediaPlayerEntity):
             )
             return False
 
-        try:
-            return data
-        except AttributeError:
-            _LOGGER.error("Received invalid response: %s", data)
-            return False
+        return data
 
     async def async_update(self):
         """Update state."""
diff --git a/homeassistant/components/xiaomi_tv/media_player.py b/homeassistant/components/xiaomi_tv/media_player.py
index c247559766b..6c0a55f787d 100644
--- a/homeassistant/components/xiaomi_tv/media_player.py
+++ b/homeassistant/components/xiaomi_tv/media_player.py
@@ -87,14 +87,14 @@ class XiaomiTV(MediaPlayerEntity):
         because the TV won't accept any input when turned off. Thus, the user
         would be unable to turn the TV back on, unless it's done manually.
         """
-        if self._state is not STATE_OFF:
+        if self._state != STATE_OFF:
             self._tv.sleep()
 
             self._state = STATE_OFF
 
     def turn_on(self):
         """Wake the TV back up from sleep."""
-        if self._state is not STATE_ON:
+        if self._state != STATE_ON:
             self._tv.wake()
 
             self._state = STATE_ON
diff --git a/homeassistant/components/yamaha_musiccast/media_player.py b/homeassistant/components/yamaha_musiccast/media_player.py
index 32f223f6728..bfec5b932a8 100644
--- a/homeassistant/components/yamaha_musiccast/media_player.py
+++ b/homeassistant/components/yamaha_musiccast/media_player.py
@@ -133,7 +133,7 @@ class YamahaDevice(MediaPlayerEntity):
     @property
     def state(self):
         """Return the state of the device."""
-        if self.power == STATE_ON and self.status is not STATE_UNKNOWN:
+        if self.power == STATE_ON and self.status != STATE_UNKNOWN:
             return self.status
         return self.power