[GitHub] [beam] damccorm opened a new issue, #20489: Python type hints: support typing.Pattern

[GitBox <gi...@apache.org>]

damccorm opened a new issue, #20489:
URL: https://github.com/apache/beam/issues/20489

   Failing test:
   ```
   
     def test_pattern(self):
       self.assertEqual(
           typehints.Any, convert_to_beam_type(typing.Pattern))
   
   ```
   
   ```
   
   native_type_compatibility_test.py:113: 
   _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
   _ _ _ _ _ _ _ _ _ _ _ 
   native_type_compatibility.py:261: in convert_to_beam_type
       matched_entry
   = next((entry for entry in type_map if entry.match(typ)), None)
   native_type_compatibility.py:261: in
   <genexpr>
       matched_entry = next((entry for entry in type_map if entry.match(typ)), None)
   native_type_compatibility.py:98:
   in <lambda>
       return lambda user_type: _safe_issubclass(user_type, match_against)
   native_type_compatibility.py:87:
   in _safe_issubclass
       return issubclass(derived, parent)
   ../../../../../../.pyenv/versions/3.6.9/lib/python3.6/typing.py:1154:
   in __subclasscheck__
       return super().__subclasscheck__(cls)
   ../../../../../../.pyenv/versions/3.6.9/lib/python3.6/abc.py:209:
   in __subclasscheck__
       ok = cls.__subclasshook__(subclass)
   ../../../../../../.pyenv/versions/3.6.9/lib/python3.6/typing.py:876:
   in __extrahook__
       res = cls.__extra__.__subclasshook__(subclass)
   ../../../../../../.pyenv/versions/3.6.9/lib/python3.6/_collections_abc.py:353:
   in __subclasshook__
       'send', 'throw', 'close')
   _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
   _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
   
   C = Pattern[~AnyStr]
   methods = ('__iter__', '__next__', 'send',
   'throw', 'close')
   
       def _check_methods(C, *methods):
   >       mro = C.__mro__
   E       AttributeError:
   '_TypeAlias' object has no attribute '__mro__'
   
   
   ```
   
   
   Imported from Jira [BEAM-10254](https://issues.apache.org/jira/browse/BEAM-10254). Original Jira may contain additional context.
   Reported by: udim.


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