Client Type Annotation (linode#222)

* Type annotation

* Add venv to .gitignore

* Apply postponed evaluation of annotations

* Remove unused import

Author: zliang-akamai

.gitignore

@@ -9,3 +9,4 @@ docs/_build/*
 .coverage
 .pytest_cache/*
 .tox/*
+venv

linode_api4/linode_client.py

@@ -1,8 +1,10 @@
+from __future__ import annotations
+
 import json
 import logging
-from datetime import datetime
 import os
 import time
+from datetime import datetime
 
 import pkg_resources
 import requests
@@ -11,7 +13,7 @@
 from linode_api4.objects import *
 from linode_api4.objects.filtering import Filter
 
-from .common import load_and_validate_keys, SSH_KEY_TYPES
+from .common import SSH_KEY_TYPES, load_and_validate_keys
 from .paginated_list import PaginatedList
 
 package_version = pkg_resources.require("linode_api4")[0].version
@@ -20,7 +22,7 @@
 
 
 class Group:
-    def __init__(self, client):
+    def __init__(self, client: LinodeClient):
         self.client = client