Makes HfArgumentParser compatible with Python 3.9 #9479
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Python 3.9 changed the format of the string serialization of `typing.Optional`. For example, `str(typing.Optional[str])` is `typing.Union[str, NoneType]` in python 3.8 and `typing.Optional[str]` in Python 3.9.
sgugger
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Jan 8, 2021
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guyrosin
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Jan 15, 2021
Python 3.9 changed the format of the string serialization of `typing.Optional`. For example, `str(typing.Optional[str])` is `typing.Union[str, NoneType]` in python 3.8 and `typing.Optional[str]` in Python 3.9.
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Python 3.9 changed the format of the string serialization of
typing.Optional.For example,
str(typing.Optional[str])istyping.Union[str, NoneType]in python 3.8 andtyping.Optional[str]in Python 3.9.