Improve type information

Most parameters to Client's __init__ are optional.
This matters when adding more types other places.

wideq/client.py

@@ -25,7 +25,7 @@ class Monitor(object):
     makes one `Monitor` object suitable for long-term monitoring.
     """
 
-    def __init__(self, session, device_id) -> None:
+    def __init__(self, session: core.Session, device_id: str) -> None:
         self.session = session
         self.device_id = device_id
 
@@ -75,13 +75,16 @@ class Client(object):
     and allows serialization of state.
     """
 
-    def __init__(self, gateway=None, auth=None, session=None,
+    def __init__(self,
+                 gateway: Optional[core.Gateway] = None,
+                 auth: Optional[core.Auth] = None,
+                 session: Optional[core.Session] = None,
                  country: str = DEFAULT_COUNTRY,
                  language: str = DEFAULT_LANGUAGE) -> None:
         # The three steps required to get access to call the API.
-        self._gateway: core.Gateway = gateway
-        self._auth: core.Auth = auth
-        self._session: core.Session = session
+        self._gateway: Optional[core.Gateway] = gateway
+        self._auth: Optional[core.Auth] = auth
+        self._session: Optional[core.Session] = session
 
         # The last list of devices we got from the server. This is the
         # raw JSON list data describing the devices.

wideq/core.py

@@ -7,7 +7,7 @@ import hashlib
 import hmac
 import datetime
 import requests
-from typing import Any, Dict, List
+from typing import Any, Dict, List, Tuple
 
 GATEWAY_URL = 'https://kic.lgthinq.com:46030/api/common/gatewayUriList'
 APP_KEY = 'wideq'
@@ -252,7 +252,7 @@ class Gateway(object):
         self.language = language
 
     @classmethod
-    def discover(cls, country, language):
+    def discover(cls, country, language) -> 'Gateway':
         gw = gateway_info(country, language)
         return cls(gw['empUri'], gw['thinqUri'], gw['oauthUri'],
                    country, language)
@@ -275,7 +275,7 @@ class Auth(object):
         access_token, refresh_token = parse_oauth_callback(url)
         return cls(gateway, access_token, refresh_token)
 
-    def start_session(self):
+    def start_session(self) -> Tuple['Session', List[Dict[str, Any]]]:
         """Start an API session for the logged-in user. Return the
         Session object and a list of the user's devices.
         """