Backport PR #49053 on branch 1.5.x (REVERT caching in find_stack_level) (#49079)

Author: MarcoGorelli

doc/source/development/contributing_codebase.rst

@@ -134,7 +134,7 @@ Otherwise, you need to do it manually:
         warnings.warn(
             'Use new_func instead.',
             FutureWarning,
-            stacklevel=find_stack_level(inspect.currentframe()),
+            stacklevel=find_stack_level(),
         )
         new_func()
 

pandas/_config/config.py

@@ -54,7 +54,6 @@
     ContextDecorator,
     contextmanager,
 )
-import inspect
 import re
 from typing import (
     Any,
@@ -662,7 +661,7 @@ def _warn_if_deprecated(key: str) -> bool:
             warnings.warn(
                 d.msg,
                 FutureWarning,
-                stacklevel=find_stack_level(inspect.currentframe()),
+                stacklevel=find_stack_level(),
             )
         else:
             msg = f"'{key}' is deprecated"
@@ -673,9 +672,7 @@ def _warn_if_deprecated(key: str) -> bool:
             else:
                 msg += ", please refrain from using it."
 
-            warnings.warn(
-                msg, FutureWarning, stacklevel=find_stack_level(inspect.currentframe())
-            )
+            warnings.warn(msg, FutureWarning, stacklevel=find_stack_level())
         return True
     return False