gh-104886: Remove deprecated configparser.LegacyInterpolation (#104887)

Co-authored-by: Victor Stinner <vstinner@python.org>

1 files changed, 1 insertions, 48 deletions

diff --git a/Lib/configparser.py b/Lib/configparser.py
index dee5a0d..9640f71 100644
--- a/Lib/configparser.py
+++ b/Lib/configparser.py
@@ -155,7 +155,7 @@ __all__ = ("NoSectionError", "DuplicateOptionError", "DuplicateSectionError",
            "ParsingError", "MissingSectionHeaderError",
            "ConfigParser", "RawConfigParser",
            "Interpolation", "BasicInterpolation",  "ExtendedInterpolation",
-           "LegacyInterpolation", "SectionProxy", "ConverterMapping",
+           "SectionProxy", "ConverterMapping",
            "DEFAULTSECT", "MAX_INTERPOLATION_DEPTH")
 
 _default_dict = dict
@@ -491,53 +491,6 @@ class ExtendedInterpolation(Interpolation):
                     "found: %r" % (rest,))
 
 
-class LegacyInterpolation(Interpolation):
-    """Deprecated interpolation used in old versions of ConfigParser.
-    Use BasicInterpolation or ExtendedInterpolation instead."""
-
-    _KEYCRE = re.compile(r"%\(([^)]*)\)s|.")
-
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-        warnings.warn(
-            "LegacyInterpolation has been deprecated since Python 3.2 "
-            "and will be removed from the configparser module in Python 3.13. "
-            "Use BasicInterpolation or ExtendedInterpolation instead.",
-            DeprecationWarning, stacklevel=2
-        )
-
-    def before_get(self, parser, section, option, value, vars):
-        rawval = value
-        depth = MAX_INTERPOLATION_DEPTH
-        while depth:                    # Loop through this until it's done
-            depth -= 1
-            if value and "%(" in value:
-                replace = functools.partial(self._interpolation_replace,
-                                            parser=parser)
-                value = self._KEYCRE.sub(replace, value)
-                try:
-                    value = value % vars
-                except KeyError as e:
-                    raise InterpolationMissingOptionError(
-                        option, section, rawval, e.args[0]) from None
-            else:
-                break
-        if value and "%(" in value:
-            raise InterpolationDepthError(option, section, rawval)
-        return value
-
-    def before_set(self, parser, section, option, value):
-        return value
-
-    @staticmethod
-    def _interpolation_replace(match, parser):
-        s = match.group(1)
-        if s is None:
-            return match.group()
-        else:
-            return "%%(%s)s" % parser.optionxform(s)
-
-
 class RawConfigParser(MutableMapping):
     """ConfigParser that does not do interpolation."""