Logger.getChild subclass compatible typehint (#6609)

Co-authored-by: Randolf Scholz <[email protected]>
Co-authored-by: Akuli <[email protected]>
Co-authored-by: Alex Waygood <[email protected]>

Author: 4 people

stdlib/logging/__init__.pyi

@@ -1,6 +1,6 @@
 import sys
 import threading
-from _typeshed import StrPath, SupportsWrite
+from _typeshed import Self, StrPath, SupportsWrite
 from collections.abc import Callable, Iterable, Mapping, MutableMapping, Sequence
 from io import TextIOWrapper
 from string import Template
@@ -59,7 +59,7 @@ class Logger(Filterer):
     def setLevel(self, level: _Level) -> None: ...
     def isEnabledFor(self, level: int) -> bool: ...
     def getEffectiveLevel(self) -> int: ...
-    def getChild(self, suffix: str) -> Logger: ...
+    def getChild(self: Self, suffix: str) -> Self: ...  # see python/typing#980
     if sys.version_info >= (3, 8):
         def debug(
             self,