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Extract name, version, python version from a filename (no extension)
Return name, version, pyver or None
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A utility method used to get name and version from a string.
From e.g. a Provides-Dist value.
:param p: A value in a form 'foo (1.0)'
:return: The name and version as a tuple.
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A class implementing a cache for resources that need to live in the file system
e.g. shared libraries. This class was moved from resources to here because it
could be used by other modules, e.g. the wheel module.
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Initialise an instance.
:param base: The base directory where the cache should be located.
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Clear the cache.
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Add a subscriber for an event.
:param event: The name of an event.
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Remove a subscriber for an event.
:param event: The name of an event.
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Return an iterator for the subscribers for an event.
:param event: The event to return subscribers for.
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