diff --git a/homeassistant/components/filter/sensor.py b/homeassistant/components/filter/sensor.py
index b1ce967d6cd..ccb0a5b12f5 100644
--- a/homeassistant/components/filter/sensor.py
+++ b/homeassistant/components/filter/sensor.py
@@ -6,6 +6,7 @@ from numbers import Number
 from functools import partial
 from copy import copy
 from datetime import timedelta
+from typing import Optional
 
 import voluptuous as vol
 
@@ -333,17 +334,21 @@ class FilterState:
 
 
 class Filter:
-    """Filter skeleton.
+    """Filter skeleton."""
 
-    Args:
-        window_size (int): size of the sliding window that holds previous
-                                values
-        precision (int): round filtered value to precision value
-        entity (string): used for debugging only
-    """
+    def __init__(
+        self,
+        name,
+        window_size: int = 1,
+        precision: Optional[int] = None,
+        entity: Optional[str] = None,
+    ):
+        """Initialize common attributes.
 
-    def __init__(self, name, window_size=1, precision=None, entity=None):
-        """Initialize common attributes."""
+        :param window_size: size of the sliding window that holds previous values
+        :param precision: round filtered value to precision value
+        :param entity: used for debugging only
+        """
         if isinstance(window_size, int):
             self.states = deque(maxlen=window_size)
             self.window_unit = WINDOW_SIZE_UNIT_NUMBER_EVENTS
@@ -394,14 +399,19 @@ class RangeFilter(Filter):
 
     Determines if new state is in the range of upper_bound and lower_bound.
     If not inside, lower or upper bound is returned instead.
-
-    Args:
-        upper_bound (float): band upper bound
-        lower_bound (float): band lower bound
     """
 
-    def __init__(self, entity, lower_bound=None, upper_bound=None):
-        """Initialize Filter."""
+    def __init__(
+        self,
+        entity,
+        lower_bound: Optional[float] = None,
+        upper_bound: Optional[float] = None,
+    ):
+        """Initialize Filter.
+
+        :param upper_bound: band upper bound
+        :param lower_bound: band lower bound
+        """
         super().__init__(FILTER_NAME_RANGE, entity=entity)
         self._lower_bound = lower_bound
         self._upper_bound = upper_bound
@@ -441,13 +451,13 @@ class OutlierFilter(Filter):
     """BASIC outlier filter.
 
     Determines if new state is in a band around the median.
-
-    Args:
-        radius (float): band radius
     """
 
-    def __init__(self, window_size, precision, entity, radius):
-        """Initialize Filter."""
+    def __init__(self, window_size, precision, entity, radius: float):
+        """Initialize Filter.
+
+        :param radius: band radius
+        """
         super().__init__(FILTER_NAME_OUTLIER, window_size, precision, entity)
         self._radius = radius
         self._stats_internal = Counter()
@@ -475,13 +485,9 @@ class OutlierFilter(Filter):
 
 @FILTERS.register(FILTER_NAME_LOWPASS)
 class LowPassFilter(Filter):
-    """BASIC Low Pass Filter.
+    """BASIC Low Pass Filter."""
 
-    Args:
-        time_constant (int): time constant.
-    """
-
-    def __init__(self, window_size, precision, entity, time_constant):
+    def __init__(self, window_size, precision, entity, time_constant: int):
         """Initialize Filter."""
         super().__init__(FILTER_NAME_LOWPASS, window_size, precision, entity)
         self._time_constant = time_constant
@@ -505,15 +511,15 @@ class TimeSMAFilter(Filter):
     """Simple Moving Average (SMA) Filter.
 
     The window_size is determined by time, and SMA is time weighted.
-
-    Args:
-        type (enum): type of algorithm used to connect discrete values
     """
 
     def __init__(
         self, window_size, precision, entity, type
     ):  # pylint: disable=redefined-builtin
-        """Initialize Filter."""
+        """Initialize Filter.
+
+        :param type: type of algorithm used to connect discrete values
+        """
         super().__init__(FILTER_NAME_TIME_SMA, window_size, precision, entity)
         self._time_window = window_size
         self.last_leak = None
diff --git a/homeassistant/components/islamic_prayer_times/sensor.py b/homeassistant/components/islamic_prayer_times/sensor.py
index 44a27963971..88cbd2cb431 100644
--- a/homeassistant/components/islamic_prayer_times/sensor.py
+++ b/homeassistant/components/islamic_prayer_times/sensor.py
@@ -89,6 +89,7 @@ async def schedule_future_update(hass, sensors, midnight_time, prayer_times_data
 
     calculated midnight = 1:35AM (after traditional midnight)
     update time: 1:36AM.
+
     """
     _LOGGER.debug("Scheduling next update for Islamic prayer times")
 
diff --git a/homeassistant/components/lw12wifi/light.py b/homeassistant/components/lw12wifi/light.py
index d4b7a59e79c..3b9ccae1681 100644
--- a/homeassistant/components/lw12wifi/light.py
+++ b/homeassistant/components/lw12wifi/light.py
@@ -55,9 +55,8 @@ class LW12WiFi(Light):
     def __init__(self, name, lw12_light):
         """Initialise LW-12 WiFi LED Controller.
 
-        Args:
-            name: Friendly name for this platform to use.
-            lw12_light: Instance of the LW12 controller.
+        :param name: Friendly name for this platform to use.
+        :param lw12_light: Instance of the LW12 controller.
         """
         self._light = lw12_light
         self._name = name
diff --git a/homeassistant/components/wunderground/sensor.py b/homeassistant/components/wunderground/sensor.py
index 03a84ca4599..21f87d9ce0b 100644
--- a/homeassistant/components/wunderground/sensor.py
+++ b/homeassistant/components/wunderground/sensor.py
@@ -3,6 +3,7 @@ import asyncio
 from datetime import timedelta
 import logging
 import re
+from typing import Any, Callable, Optional, Union
 
 import aiohttp
 import async_timeout
@@ -56,29 +57,25 @@ class WUSensorConfig:
 
     def __init__(
         self,
-        friendly_name,
-        feature,
-        value,
-        unit_of_measurement=None,
+        friendly_name: Union[str, Callable],
+        feature: str,
+        value: Callable[["WUndergroundData"], Any],
+        unit_of_measurement: Optional[str] = None,
         entity_picture=None,
-        icon="mdi:gauge",
+        icon: str = "mdi:gauge",
         device_state_attributes=None,
         device_class=None,
     ):
         """Constructor.
 
-        Args:
-            friendly_name (string|func): Friendly name
-            feature (string): WU feature. See:
+        :param friendly_name: Friendly name
+        :param feature: WU feature. See:
                 https://www.wunderground.com/weather/api/d/docs?d=data/index
-            value (function(WUndergroundData)): callback that
-                extracts desired value from WUndergroundData object
-            unit_of_measurement (string): unit of measurement
-            entity_picture (string): value or callback returning
-                URL of entity picture
-            icon (string): icon name or URL
-            device_state_attributes (dict): dictionary of attributes,
-                or callable that returns it
+        :param value: callback that extracts desired value from WUndergroundData object
+        :param unit_of_measurement: unit of measurement
+        :param entity_picture: value or callback returning URL of entity picture
+        :param icon: icon name or URL
+        :param device_state_attributes: dictionary of attributes, or callable that returns it
         """
         self.friendly_name = friendly_name
         self.unit_of_measurement = unit_of_measurement
@@ -95,21 +92,18 @@ class WUCurrentConditionsSensorConfig(WUSensorConfig):
 
     def __init__(
         self,
-        friendly_name,
-        field,
-        icon="mdi:gauge",
-        unit_of_measurement=None,
+        friendly_name: Union[str, Callable],
+        field: str,
+        icon: Optional[str] = "mdi:gauge",
+        unit_of_measurement: Optional[str] = None,
         device_class=None,
     ):
         """Constructor.
 
-        Args:
-            friendly_name (string|func): Friendly name of sensor
-            field (string): Field name in the "current_observation"
-                            dictionary.
-            icon (string): icon name or URL, if None sensor
-                           will use current weather symbol
-            unit_of_measurement (string): unit of measurement
+        :param friendly_name: Friendly name of sensor
+        :field: Field name in the "current_observation" dictionary.
+        :icon: icon name or URL, if None sensor will use current weather symbol
+        :unit_of_measurement: unit of measurement
         """
         super().__init__(
             friendly_name,
@@ -130,13 +124,14 @@ class WUCurrentConditionsSensorConfig(WUSensorConfig):
 class WUDailyTextForecastSensorConfig(WUSensorConfig):
     """Helper for defining sensor configurations for daily text forecasts."""
 
-    def __init__(self, period, field, unit_of_measurement=None):
+    def __init__(
+        self, period: int, field: str, unit_of_measurement: Optional[str] = None
+    ):
         """Constructor.
 
-        Args:
-            period (int): forecast period number
-            field (string):  field name to use as value
-            unit_of_measurement(string): unit of measurement
+        :param period: forecast period number
+        :param field: field name to use as value
+        :param unit_of_measurement: unit of measurement
         """
         super().__init__(
             friendly_name=lambda wu: wu.data["forecast"]["txt_forecast"]["forecastday"][
@@ -161,24 +156,22 @@ class WUDailySimpleForecastSensorConfig(WUSensorConfig):
 
     def __init__(
         self,
-        friendly_name,
-        period,
-        field,
-        wu_unit=None,
-        ha_unit=None,
+        friendly_name: str,
+        period: int,
+        field: str,
+        wu_unit: Optional[str] = None,
+        ha_unit: Optional[str] = None,
         icon=None,
         device_class=None,
     ):
         """Constructor.
 
-        Args:
-            period (int): forecast period number
-            field (string): field name to use as value
-            wu_unit (string): "fahrenheit", "celsius", "degrees" etc.
-                 see the example json at:
-        https://www.wunderground.com/weather/api/d/docs?d=data/forecast&MR=1
-            ha_unit (string): corresponding unit in home assistant
-            title (string): friendly_name of the sensor
+        :param friendly_name: friendly_name of the sensor
+        :param period: forecast period number
+        :param field: field name to use as value
+        :param wu_unit: "fahrenheit", "celsius", "degrees" etc. see the example json at:
+                https://www.wunderground.com/weather/api/d/docs?d=data/forecast&MR=1
+        :param ha_unit: corresponding unit in home assistant
         """
         super().__init__(
             friendly_name=friendly_name,
@@ -213,12 +206,11 @@ class WUDailySimpleForecastSensorConfig(WUSensorConfig):
 class WUHourlyForecastSensorConfig(WUSensorConfig):
     """Helper for defining sensor configurations for hourly text forecasts."""
 
-    def __init__(self, period, field):
+    def __init__(self, period: int, field: int):
         """Constructor.
 
-        Args:
-            period (int): forecast period number
-            field (int): field name to use as value
+        :param period: forecast period number
+        :param field: field name to use as value
         """
         super().__init__(
             friendly_name=lambda wu: "{} {}".format(
@@ -274,24 +266,22 @@ class WUAlmanacSensorConfig(WUSensorConfig):
 
     def __init__(
         self,
-        friendly_name,
-        field,
-        value_type,
-        wu_unit,
-        unit_of_measurement,
-        icon,
+        friendly_name: Union[str, Callable],
+        field: str,
+        value_type: str,
+        wu_unit: str,
+        unit_of_measurement: str,
+        icon: str,
         device_class=None,
     ):
         """Constructor.
 
-        Args:
-            friendly_name (string|func): Friendly name
-            field (string): value name returned in 'almanac' dict
-                            as returned by the WU API
-            value_type (string):  "record" or "normal"
-            wu_unit (string): unit name in WU API
-            icon (string): icon name or URL
-            unit_of_measurement (string): unit of measurement
+        :param friendly_name: Friendly name
+        :param field: value name returned in 'almanac' dict as returned by the WU API
+        :param value_type: "record" or "normal"
+        :param wu_unit: unit name in WU API
+        :param unit_of_measurement: unit of measurement
+        :param icon: icon name or URL
         """
         super().__init__(
             friendly_name=friendly_name,
@@ -306,11 +296,10 @@ class WUAlmanacSensorConfig(WUSensorConfig):
 class WUAlertsSensorConfig(WUSensorConfig):
     """Helper for defining field configuration for alerts."""
 
-    def __init__(self, friendly_name):
+    def __init__(self, friendly_name: Union[str, Callable]):
         """Constructor.
 
-        Args:
-            friendly_name (string|func): Friendly name
+        :param friendly_name: Friendly name
         """
         super().__init__(
             friendly_name=friendly_name,
diff --git a/homeassistant/util/ruamel_yaml.py b/homeassistant/util/ruamel_yaml.py
index 931ad7adb91..70f447a3b0d 100644
--- a/homeassistant/util/ruamel_yaml.py
+++ b/homeassistant/util/ruamel_yaml.py
@@ -40,6 +40,7 @@ def _include_yaml(
 
     Example:
         device_tracker: !include device_tracker.yaml
+
     """
     if constructor.name is None:
         raise HomeAssistantError(
diff --git a/homeassistant/util/yaml/loader.py b/homeassistant/util/yaml/loader.py
index f5dfdb933f2..3cbf0481673 100644
--- a/homeassistant/util/yaml/loader.py
+++ b/homeassistant/util/yaml/loader.py
@@ -113,6 +113,7 @@ def _include_yaml(loader: SafeLineLoader, node: yaml.nodes.Node) -> JSON_TYPE:
 
     Example:
         device_tracker: !include device_tracker.yaml
+
     """
     fname = os.path.join(os.path.dirname(loader.name), node.value)
     return _add_reference(load_yaml(fname), loader, node)
diff --git a/requirements_test.txt b/requirements_test.txt
index 7589c9ec27d..bcbc53f2649 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -7,11 +7,11 @@ asynctest==0.13.0
 black==19.3b0
 codecov==2.0.15
 coveralls==1.2.0
-flake8-docstrings==1.3.0
+flake8-docstrings==1.3.1
 flake8==3.7.8
 mock-open==1.3.1
 mypy==0.720
-pydocstyle==3.0.0
+pydocstyle==4.0.0
 pylint==2.3.1
 pytest-aiohttp==0.3.0
 pytest-cov==2.7.1
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index 6549e9964ca..e92cf8a24bd 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -8,11 +8,11 @@ asynctest==0.13.0
 black==19.3b0
 codecov==2.0.15
 coveralls==1.2.0
-flake8-docstrings==1.3.0
+flake8-docstrings==1.3.1
 flake8==3.7.8
 mock-open==1.3.1
 mypy==0.720
-pydocstyle==3.0.0
+pydocstyle==4.0.0
 pylint==2.3.1
 pytest-aiohttp==0.3.0
 pytest-cov==2.7.1
diff --git a/tox.ini b/tox.ini
index dd7206f403a..2d4cf7c54ba 100644
--- a/tox.ini
+++ b/tox.ini
@@ -35,7 +35,6 @@ commands =
     python -m script.gen_requirements_all validate
     python -m script.hassfest validate
     flake8 {posargs: homeassistant tests script}
-    pydocstyle {posargs:homeassistant tests}
 
 [testenv:typing]
 whitelist_externals=/bin/bash