Defer importing warnings in several modules

Lib/argparse.py

@@ -89,8 +89,6 @@
 import re as _re
 import sys as _sys
 
-import warnings
-
 from gettext import gettext as _, ngettext
 
 SUPPRESS = '==SUPPRESS=='
@@ -910,6 +908,7 @@ def __init__(self,
         #   parser.add_argument('-f', action=BooleanOptionalAction, type=int)
         for field_name in ('type', 'choices', 'metavar'):
             if locals()[field_name] is not _deprecated_default:
+                import warnings
                 warnings._deprecated(
                     field_name,
                     "{name!r} is deprecated as of Python 3.12 and will be "
@@ -1700,6 +1699,7 @@ def _remove_action(self, action):
         self._group_actions.remove(action)
 
     def add_argument_group(self, *args, **kwargs):
+        import warnings
         warnings.warn(
             "Nesting argument groups is deprecated.",
             category=DeprecationWarning,
@@ -1728,6 +1728,7 @@ def _remove_action(self, action):
         self._group_actions.remove(action)
 
     def add_mutually_exclusive_group(self, *args, **kwargs):
+        import warnings
         warnings.warn(
             "Nesting mutually exclusive groups is deprecated.",
             category=DeprecationWarning,

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/hmac.py

@@ -3,7 +3,6 @@
 Implements the HMAC algorithm as described by RFC 2104.
 """
 
-import warnings as _warnings
 try:
     import _hashlib as _hashopenssl
 except ImportError:
@@ -84,11 +83,13 @@ def _init_old(self, key, msg, digestmod):
         if hasattr(self._inner, 'block_size'):
             blocksize = self._inner.block_size
             if blocksize < 16:
+                import warnings as _warnings
                 _warnings.warn('block_size of %d seems too small; using our '
                                'default of %d.' % (blocksize, self.blocksize),
                                RuntimeWarning, 2)
                 blocksize = self.blocksize
         else:
+            import warnings as _warnings
             _warnings.warn('No block_size attribute on given digest object; '
                            'Assuming %d.' % (self.blocksize),
                            RuntimeWarning, 2)

Lib/mailbox.py

@@ -12,7 +12,6 @@
 import socket
 import errno
 import copy
-import warnings
 import email
 import email.message
 import email.generator
@@ -223,6 +222,7 @@ def _dump_message(self, message, target, mangle_from_=False):
                 target.write(linesep)
         elif isinstance(message, (str, bytes, io.StringIO)):
             if isinstance(message, io.StringIO):
+                import warnings
                 warnings.warn("Use of StringIO input is deprecated, "
                     "use BytesIO instead", DeprecationWarning, 3)
                 message = message.getvalue()
@@ -237,6 +237,7 @@ def _dump_message(self, message, target, mangle_from_=False):
                 target.write(linesep)
         elif hasattr(message, 'read'):
             if hasattr(message, 'buffer'):
+                import warnings
                 warnings.warn("Use of text mode files is deprecated, "
                     "use a binary mode file instead", DeprecationWarning, 3)
                 message = message.buffer
@@ -1432,6 +1433,7 @@ def _install_message(self, message):
                 self._file.write(buffer.replace(b'\n', linesep))
         elif isinstance(message, (bytes, str, io.StringIO)):
             if isinstance(message, io.StringIO):
+                import warnings
                 warnings.warn("Use of StringIO input is deprecated, "
                     "use BytesIO instead", DeprecationWarning, 3)
                 message = message.getvalue()
@@ -1448,6 +1450,7 @@ def _install_message(self, message):
                 self._file.write(message.replace(b'\n', linesep))
         elif hasattr(message, 'readline'):
             if hasattr(message, 'buffer'):
+                import warnings
                 warnings.warn("Use of text mode files is deprecated, "
                     "use a binary mode file instead", DeprecationWarning, 3)
                 message = message.buffer

Lib/pathlib.py

@@ -14,7 +14,6 @@
 import posixpath
 import re
 import sys
-import warnings
 from _collections_abc import Sequence
 from errno import ENOENT, ENOTDIR, EBADF, ELOOP, EINVAL
 from stat import S_ISDIR, S_ISLNK, S_ISREG, S_ISSOCK, S_ISBLK, S_ISCHR, S_ISFIFO
@@ -643,6 +642,7 @@ def relative_to(self, other, /, *_deprecated, walk_up=False):
         the path.
         """
         if _deprecated:
+            import warnings
             msg = ("support for supplying more than one positional argument "
                    "to pathlib.PurePath.relative_to() is deprecated and "
                    "scheduled for removal in Python {remove}")
@@ -665,6 +665,7 @@ def is_relative_to(self, other, /, *_deprecated):
         """Return True if the path is relative to another path or False.
         """
         if _deprecated:
+            import warnings
             msg = ("support for supplying more than one argument to "
                    "pathlib.PurePath.is_relative_to() is deprecated and "
                    "scheduled for removal in Python {remove}")
@@ -1115,6 +1116,7 @@ def _glob(self, pattern, case_sensitive, follow_symlinks):
             # GH-65238: pathlib doesn't preserve trailing slash. Add it back.
             pattern_parts.append('')
         if pattern_parts[-1] == '**':
+            import warnings
             # GH-70303: '**' only matches directories. Add trailing slash.
             warnings.warn(
                 "Pattern ending '**' will match files and directories in a "
@@ -1445,6 +1447,7 @@ class Path(_PathBase):
 
     def __init__(self, *args, **kwargs):
         if kwargs:
+            import warnings
             msg = ("support for supplying keyword arguments to pathlib.PurePath "
                    "is deprecated and scheduled for removal in Python {remove}")
             warnings._deprecated("pathlib.PurePath(**kwargs)", msg, remove=(3, 14))

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. '

Lib/wsgiref/validate.py

@@ -113,7 +113,6 @@
 
 import re
 import sys
-import warnings
 
 header_re = re.compile(r'^[a-zA-Z][a-zA-Z0-9\-_]*$')
 bad_header_value_re = re.compile(r'[\000-\037]')
@@ -310,6 +309,7 @@ def check_environ(environ):
             "(use %s instead)" % (key, key[5:]))
 
     if 'QUERY_STRING' not in environ:
+        import warnings
         warnings.warn(
             'QUERY_STRING is not in the WSGI environment; the cgi '
             'module will use sys.argv when this variable is missing, '
@@ -335,6 +335,7 @@ def check_environ(environ):
     # @@: these need filling out:
     if environ['REQUEST_METHOD'] not in (
         'GET', 'HEAD', 'POST', 'OPTIONS', 'PATCH', 'PUT', 'DELETE', 'TRACE'):
+        import warnings
         warnings.warn(
             "Unknown REQUEST_METHOD: %r" % environ['REQUEST_METHOD'],
             WSGIWarning)
@@ -378,6 +379,7 @@ def check_status(status):
     status_int = int(status_code)
     assert_(status_int >= 100, "Status code is invalid: %r" % status_int)
     if len(status) < 4 or status[3] != ' ':
+        import warnings
         warnings.warn(
             "The status string (%r) should be a three-digit integer "
             "followed by a single space and a status explanation"

Lib/xml/etree/ElementTree.py

@@ -94,7 +94,6 @@
 
 import sys
 import re
-import warnings
 import io
 import collections
 import collections.abc
@@ -199,6 +198,7 @@ def __len__(self):
         return len(self._children)
 
     def __bool__(self):
+        import warnings
         warnings.warn(
             "Testing an element's truth value will raise an exception in "
             "future versions.  "
@@ -601,6 +601,7 @@ def find(self, path, namespaces=None):
         # assert self._root is not None
         if path[:1] == "/":
             path = "." + path
+            import warnings
             warnings.warn(
                 "This search is broken in 1.3 and earlier, and will be "
                 "fixed in a future version.  If you rely on the current "
@@ -623,6 +624,7 @@ def findtext(self, path, default=None, namespaces=None):
         # assert self._root is not None
         if path[:1] == "/":
             path = "." + path
+            import warnings
             warnings.warn(
                 "This search is broken in 1.3 and earlier, and will be "
                 "fixed in a future version.  If you rely on the current "
@@ -645,6 +647,7 @@ def findall(self, path, namespaces=None):
         # assert self._root is not None
         if path[:1] == "/":
             path = "." + path
+            import warnings
             warnings.warn(
                 "This search is broken in 1.3 and earlier, and will be "
                 "fixed in a future version.  If you rely on the current "
@@ -667,6 +670,7 @@ def iterfind(self, path, namespaces=None):
         # assert self._root is not None
         if path[:1] == "/":
             path = "." + path
+            import warnings
             warnings.warn(
                 "This search is broken in 1.3 and earlier, and will be "
                 "fixed in a future version.  If you rely on the current "
@@ -1681,6 +1685,7 @@ def _default(self, text):
                 if hasattr(self.target, "doctype"):
                     self.target.doctype(name, pubid, system[1:-1])
                 elif hasattr(self, "doctype"):
+                    import warnings
                     warnings.warn(
                         "The doctype() method of XMLParser is ignored.  "
                         "Define doctype() method on the TreeBuilder target.",