Defer importing warnings in several modules

Lib/calendar.py

@@ -10,7 +10,6 @@
 from enum import IntEnum, global_enum
 import locale as _locale
 from itertools import repeat
-import warnings
 
 __all__ = ["IllegalMonthError", "IllegalWeekdayError", "setfirstweekday",
            "firstweekday", "isleap", "leapdays", "weekday", "monthrange",
@@ -44,6 +43,7 @@ def __str__(self):
 
 def __getattr__(name):
     if name in ('January', 'February'):
+        import warnings
         warnings.warn(f"The '{name}' attribute is deprecated, use '{name.upper()}' instead",
                       DeprecationWarning, stacklevel=2)
         if name == 'January':

Lib/getpass.py

@@ -18,7 +18,6 @@
 import io
 import os
 import sys
-import warnings
 
 __all__ = ["getpass","getuser","GetPassWarning"]
 
@@ -118,6 +117,7 @@ def win_getpass(prompt='Password: ', stream=None):
 
 
 def fallback_getpass(prompt='Password: ', stream=None):
+    import warnings
     warnings.warn("Can not control echo on the terminal.", GetPassWarning,
                   stacklevel=2)
     if not stream:

Lib/pkgutil.py

@@ -9,7 +9,6 @@
 import os.path
 import sys
 from types import ModuleType
-import warnings
 
 __all__ = [
     'get_importer', 'iter_importers', 'get_loader', 'find_loader',
@@ -270,6 +269,7 @@ def get_loader(module_or_name):
     If the named module is not already imported, its containing package
     (if any) is imported, in order to establish the package __path__.
     """
+    import warnings
     warnings._deprecated("pkgutil.get_loader",
                          f"{warnings._DEPRECATED_MSG}; "
                          "use importlib.util.find_spec() instead",
@@ -298,6 +298,7 @@ def find_loader(fullname):
     importlib.util.find_spec that converts most failures to ImportError
     and only returns the loader rather than the full spec
     """
+    import warnings
     warnings._deprecated("pkgutil.find_loader",
                          f"{warnings._DEPRECATED_MSG}; "
                          "use importlib.util.find_spec() instead",

Lib/shutil.py

@@ -10,7 +10,6 @@
 import fnmatch
 import collections
 import errno
-import warnings
 
 try:
     import zlib
@@ -723,6 +722,7 @@ def rmtree(path, ignore_errors=False, onerror=None, *, onexc=None, dir_fd=None):
     """
 
     if onerror is not None:
+        import warnings
         warnings.warn("onerror argument is deprecated, use onexc instead",
                       DeprecationWarning, stacklevel=2)
 

Lib/tarfile.py

@@ -46,7 +46,6 @@
 import struct
 import copy
 import re
-import warnings
 
 try:
     import pwd
@@ -2219,6 +2218,7 @@ def _get_filter_function(self, filter):
         if filter is None:
             filter = self.extraction_filter
             if filter is None:
+                import warnings
                 warnings.warn(
                     'Python 3.14 will, by default, filter extracted tar '
                     + 'archives and reject files or modify their metadata. '