[configparser] Add several deprecated attributes (#14487)

stdlib/@tests/stubtest_allowlists/py310.txt

@@ -107,7 +107,6 @@ tkinter.Tk.split  # Exists at runtime, but missing from stubs
 # =======
 
 _?bz2.BZ2Decompressor.__init__  # function does not accept parameters but C signature is set
-configparser.ParsingError.filename
 enum.Enum._generate_next_value_
 importlib.abc.Finder.find_module
 urllib.request.HTTPPasswordMgrWithPriorAuth.__init__  # Args are passed as is to super, so super args are specified

stdlib/@tests/stubtest_allowlists/py311.txt

@@ -70,7 +70,6 @@ importlib.metadata._meta.SimplePath.__truediv__  # Runtime definition of protoco
 # =======
 
 _?bz2.BZ2Decompressor.__init__  # function does not accept parameters but C signature is set
-configparser.ParsingError.filename
 enum.Enum._generate_next_value_
 importlib.abc.Finder.find_module
 urllib.request.HTTPPasswordMgrWithPriorAuth.__init__  # Args are passed as is to super, so super args are specified

stdlib/@tests/stubtest_allowlists/py39.txt

@@ -54,7 +54,6 @@ typing_extensions.Sentinel.__call__
 # =======
 
 _?bz2.BZ2Decompressor.__init__  # function does not accept parameters but C signature is set
-configparser.ParsingError.filename
 enum.Enum._generate_next_value_
 importlib.abc.Finder.find_module
 urllib.request.HTTPPasswordMgrWithPriorAuth.__init__  # Args are passed as is to super, so super args are specified

stdlib/configparser.pyi

@@ -3,7 +3,7 @@ from _typeshed import MaybeNone, StrOrBytesPath, SupportsWrite
 from collections.abc import Callable, ItemsView, Iterable, Iterator, Mapping, MutableMapping, Sequence
 from re import Pattern
 from typing import Any, ClassVar, Final, Literal, TypeVar, overload, type_check_only
-from typing_extensions import TypeAlias
+from typing_extensions import TypeAlias, deprecated
 
 if sys.version_info >= (3, 14):
     __all__ = (
@@ -271,6 +271,7 @@ class RawConfigParser(_Parser):
     def read_string(self, string: str, source: str = "<string>") -> None: ...
     def read_dict(self, dictionary: Mapping[str, Mapping[str, Any]], source: str = "<dict>") -> None: ...
     if sys.version_info < (3, 12):
+        @deprecated("Deprecated since Python 3.2; removed in Python 3.12. Use `parser.read_file()` instead.")
         def readfp(self, fp: Iterable[str], filename: str | None = None) -> None: ...
     # These get* methods are partially applied (with the same names) in
     # SectionProxy; the stubs should be kept updated together
@@ -331,7 +332,8 @@ class ConfigParser(RawConfigParser):
     ) -> str | _T: ...
 
 if sys.version_info < (3, 12):
-    class SafeConfigParser(ConfigParser): ...  # deprecated alias
+    @deprecated("Deprecated since Python 3.2; removed in Python 3.12. Use `ConfigParser` instead.")
+    class SafeConfigParser(ConfigParser): ...
 
 class SectionProxy(MutableMapping[str, str]):
     def __init__(self, parser: RawConfigParser, name: str) -> None: ...
@@ -443,10 +445,22 @@ class ParsingError(Error):
     elif sys.version_info >= (3, 12):
         def __init__(self, source: str) -> None: ...
     else:
-        def __init__(self, source: str | None = None, filename: str | None = None) -> None: ...
+        @overload
+        def __init__(self, source: str, filename: None = None) -> None: ...
+        @overload
+        @deprecated("The `filename` parameter removed in Python 3.12. Use `source` instead.")
+        def __init__(self, source: None = None, filename: str = ...) -> None: ...
 
     def append(self, lineno: int, line: str) -> None: ...
 
+    if sys.version_info < (3, 12):
+        @property
+        @deprecated("Deprecated since Python 3.2; removed in Python 3.12. Use `source` instead.")
+        def filename(self) -> str: ...
+        @filename.setter
+        @deprecated("Deprecated since Python 3.2; removed in Python 3.12. Use `source` instead.")
+        def filename(self, value: str) -> None: ...
+
 class MissingSectionHeaderError(ParsingError):
     lineno: int
     line: str