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specifiersversion RequirementNormalizedExtrarequires_python version_info.returnc | dS t j | }t j d t t | }||v S )a
Check if the given Python version matches a "Requires-Python" specifier.
:param version_info: A 3-tuple of ints representing a Python
major-minor-micro version to check (e.g. `sys.version_info[:3]`).
:return: `True` if the given Python version satisfies the requirement.
Otherwise, return `False`.
:raises InvalidSpecifier: If `requires_python` has an invalid format.
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req_stringc t | S )z5Construct a packaging.Requirement object with cachingr )r s r get_requirementr % s z " ""r extrac x t t t j dd| S )aD Convert an arbitrary string to a standard 'extra' name
Any runs of non-alphanumeric characters are replaced with a single '_',
and the result is always lowercased.
This function is duplicated from ``pkg_resources``. Note that this is not
the same to either ``canonicalize_name`` or ``_egg_link_name``.
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