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a ?&Nb � @ s. d Z ddgZdZer"ddlmZ ndd� ZdS )a; For neatly implementing static typing in packaging. `mypy` - the static type analysis tool we use - uses the `typing` module, which provides core functionality fundamental to mypy's functioning. Generally, `typing` would be imported at runtime and used in that fashion - it acts as a no-op at runtime and does not have any run-time overhead by design. As it turns out, `typing` is not vendorable - it uses separate sources for Python 2/Python 3. Thus, this codebase can not expect it to be present. To work around this, mypy allows the typing import to be behind a False-y optional to prevent it from running at runtime and type-comments can be used to remove the need for the types to be accessible directly during runtime. This module provides the False-y guard in a nicely named fashion so that a curious maintainer can reach here to read this. In packaging, all static-typing related imports should be guarded as follows: from packaging._typing import TYPE_CHECKING if TYPE_CHECKING: from typing import ... Ref: https://github.com/python/mypy/issues/3216 � TYPE_CHECKING�castF� )r c C s |S )N� )�type_�valuer r �5/usr/lib/python3.9/site-packages/packaging/_typing.pyr / s N)�__doc__�__all__r �typingr r r r r �<module> s
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