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ao Parse a requirement.
Parse a given requirement string into its parts, such as name, specifier,
URL, and extras. Raises InvalidRequirement on a badly-formed requirement
string.
Instances are safe to serialize with :mod:`pickle`. They use a stable
format so the same pickle can be loaded in future packaging releases.
.. versionchanged:: 26.2
Added a stable pickle format. Pickles created with packaging 26.2+ can
be unpickled with future releases. Backward compatibility with pickles
from packaging < 26.2 is supported but may be removed in a future
release.
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