Improvement typing core (#2624)

* Add package typing

* Add util/location typing

* FIX: lint wrong order of imports

* Fix sometyping and add helpers/entity typing

* Mypy import trick

* Add asteroid to test requiremts to fix pylint issue

* Fix deprecated function isSet for is_set

* Add loader.py typing

* Improve typing bootstrap

homeassistant/util/location.py

@@ -5,8 +5,11 @@ detect_location_info and elevation are mocked by default during tests.
 """
 import collections
 import math
+from typing import Any, Optional, Tuple, Dict
+
 import requests
 
+
 ELEVATION_URL = 'http://maps.googleapis.com/maps/api/elevation/json'
 FREEGEO_API = 'https://freegeoip.io/json/'
 IP_API = 'http://ip-api.com/json'
@@ -81,7 +84,8 @@ def elevation(latitude, longitude):
 # Source: https://github.com/maurycyp/vincenty
 # License: https://github.com/maurycyp/vincenty/blob/master/LICENSE
 # pylint: disable=too-many-locals, invalid-name, unused-variable
-def vincenty(point1, point2, miles=False):
+def vincenty(point1: Tuple[float, float], point2: Tuple[float, float],
+             miles: bool=False) -> Optional[float]:
     """
     Vincenty formula (inverse method) to calculate the distance.
 
@@ -148,7 +152,7 @@ def vincenty(point1, point2, miles=False):
     return round(s, 6)
 
 
-def _get_freegeoip():
+def _get_freegeoip() -> Optional[Dict[str, Any]]:
     """Query freegeoip.io for location data."""
     try:
         raw_info = requests.get(FREEGEO_API, timeout=5).json()
@@ -169,7 +173,7 @@ def _get_freegeoip():
     }
 
 
-def _get_ip_api():
+def _get_ip_api() -> Optional[Dict[str, Any]]:
     """Query ip-api.com for location data."""
     try:
         raw_info = requests.get(IP_API, timeout=5).json()