In get_keyring, ensure the return type is a KeyringBackend.

CHANGES.rst

@@ -1,3 +1,8 @@
+v22.1.0
+-------
+
+* Added type declaration for ``keyring.core.get_keyring()``.
+
 v22.0.1
 -------
 

keyring/core.py

@@ -6,6 +6,7 @@
 import os
 import sys
 import logging
+import typing
 
 from . import backend
 from .util import platform_ as platform
@@ -26,11 +27,11 @@ def set_keyring(keyring):
     keyring.set_properties_from_env()
 
 
-def get_keyring():
+def get_keyring() -> backend.KeyringBackend:
     """Get current keyring backend."""
     if _keyring_backend is None:
         init_backend()
-    return _keyring_backend
+    return typing.cast(backend.KeyringBackend, _keyring_backend)
 
 
 def disable():