python issue30681 is fixed with Python 3.10

pyquarantine/_runtime_patches.py

@@ -12,6 +12,7 @@
 # along with pyquarantine.  If not, see <http://www.gnu.org/licenses/>.
 #
 
+from sys import version_info
 import encodings
 
 
@@ -150,68 +151,6 @@ def get_obs_local_part(value):
 setattr(email._header_value_parser, "get_obs_local_part", get_obs_local_part)
 
 
-# https://bugs.python.org/issue30681
-#
-# fix: https://github.com/python/cpython/pull/22090
-
-import email.errors
-from email.errors import HeaderDefect
-
-
-class InvalidDateDefect(HeaderDefect):
-    """Header has unparseable or invalid date"""
-
-
-setattr(email.errors, "InvalidDateDefect", InvalidDateDefect)
-
-
-import email.utils
-from email.utils import _parsedate_tz
-import datetime
-
-
-def parsedate_to_datetime(data):
-    parsed_date_tz = _parsedate_tz(data)
-    if parsed_date_tz is None:
-        raise ValueError('Invalid date value or format "%s"' % str(data))
-    *dtuple, tz = parsed_date_tz
-    if tz is None:
-        return datetime.datetime(*dtuple[:6])
-    return datetime.datetime(*dtuple[:6],
-            tzinfo=datetime.timezone(datetime.timedelta(seconds=tz)))
-
-
-setattr(email.utils, "parsedate_to_datetime", parsedate_to_datetime)
-
-
-import email.headerregistry
-from email import utils, _header_value_parser as parser
-
-@classmethod
-def parse(cls, value, kwds):
-    if not value:
-        kwds['defects'].append(errors.HeaderMissingRequiredValue())
-        kwds['datetime'] = None
-        kwds['decoded'] = ''
-        kwds['parse_tree'] = parser.TokenList()
-        return
-    if isinstance(value, str):
-        kwds['decoded'] = value
-        try:
-            value = utils.parsedate_to_datetime(value)
-        except ValueError:
-            kwds['defects'].append(errors.InvalidDateDefect('Invalid date value or format'))
-            kwds['datetime'] = None
-            kwds['parse_tree'] = parser.TokenList()
-            return
-    kwds['datetime'] = value
-    kwds['decoded'] = utils.format_datetime(kwds['datetime'])
-    kwds['parse_tree'] = cls.value_parser(kwds['decoded'])
-
-
-setattr(email.headerregistry.DateHeader, "parse", parse)
-
-
 #######################################
 #  add charset alias for windows-874  #
 #######################################
@@ -227,3 +166,66 @@ for alias in ["windows-874", "windows_874"]:
         aliases[alias] = "cp874"
 
 setattr(encodings.aliases, "aliases", aliases)
+
+
+if version_info.major == 3 and version_info.minor < 10:
+    # https://bugs.python.org/issue30681
+    #
+    # fix: https://github.com/python/cpython/pull/22090
+
+    import email.errors
+    from email.errors import HeaderDefect
+
+
+    class InvalidDateDefect(HeaderDefect):
+        """Header has unparseable or invalid date"""
+
+
+    setattr(email.errors, "InvalidDateDefect", InvalidDateDefect)
+
+
+    import email.utils
+    from email.utils import _parsedate_tz
+    import datetime
+
+
+    def parsedate_to_datetime(data):
+        parsed_date_tz = _parsedate_tz(data)
+        if parsed_date_tz is None:
+            raise ValueError('Invalid date value or format "%s"' % str(data))
+        *dtuple, tz = parsed_date_tz
+        if tz is None:
+            return datetime.datetime(*dtuple[:6])
+        return datetime.datetime(*dtuple[:6],
+                tzinfo=datetime.timezone(datetime.timedelta(seconds=tz)))
+
+
+    setattr(email.utils, "parsedate_to_datetime", parsedate_to_datetime)
+
+
+    import email.headerregistry
+    from email import utils, _header_value_parser as parser
+
+    @classmethod
+    def parse(cls, value, kwds):
+        if not value:
+            kwds['defects'].append(errors.HeaderMissingRequiredValue())
+            kwds['datetime'] = None
+            kwds['decoded'] = ''
+            kwds['parse_tree'] = parser.TokenList()
+            return
+        if isinstance(value, str):
+            kwds['decoded'] = value
+            try:
+                value = utils.parsedate_to_datetime(value)
+            except ValueError:
+                kwds['defects'].append(errors.InvalidDateDefect('Invalid date value or format'))
+                kwds['datetime'] = None
+                kwds['parse_tree'] = parser.TokenList()
+                return
+        kwds['datetime'] = value
+        kwds['decoded'] = utils.format_datetime(kwds['datetime'])
+        kwds['parse_tree'] = cls.value_parser(kwds['decoded'])
+
+
+    setattr(email.headerregistry.DateHeader, "parse", parse)