Lars <[email protected]> added the comment:
I have been doing some research, but note that I don't have much experience
with the typing module. That said, there seem to be 2 main cases:
- '_SpecialForm': with instances Any, Union, etc.
- '_BaseGenericAlias'/'_SpecialGenericAlias': base classes collections classes.
I think '_SpecialForm' can be enhanced to have '__name__' by replacing the
'_name' attribute with '__name__'. Maybe add '__qualname__' as well. I cannot
say whether there are many more attributes that could be implemented to have
the same meaning as in 'type'. The meaning of attributes like '__mro__' seem
difficult to define.
Alternatively '__getattr__' could be added (but that might be too much):
def __getattr__(self, attr):
return getattr(self._getitem, attr)
'_BaseGenericAlias''_SpecialGenericAlias' the '__getattr__' method could
perhaps be adapted (or overridden in '_SpecialGenericAlias') as follows, from:
def __getattr__(self, attr):
# We are careful for copy and pickle.
# Also for simplicity we just don't relay all dunder names
if '__origin__' in self.__dict__ and not _is_dunder(attr):
return getattr(self.__origin__, attr)
raise AttributeError(attr)
to:
def __getattr__(self, attr):
if '__origin__' in self.__dict__:
return getattr(self.__origin__, attr)
raise AttributeError(attr)
or perhaps:
def __getattr__(self, attr):
if '__origin__' in self.__dict__ and hasattr(type, attr):
return getattr(self.__origin__, attr)
raise AttributeError(attr)
to forward unresolved attribute names to the original class.
I have written some tools and tested some with the above solutions and this
seems to solve the missing '__name__' issue and make the typing abc's much more
in line with the collection abc's. However I did not do any unit/regression
testing (pull the repo, etc.)
tools are attached.
----------
Added file: https://bugs.python.org/file50135/typing_attributes.py
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