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Support for installing and building the "wheel" binary package format.
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WheelCachec B@ s e Z d Z d � Z d � Z RS( s& A cache of wheels for future installs.c C@ s( | r t | � n d | _ | | _ d S( s� Create a wheel cache.
:param cache_dir: The root of the cache.
:param format_control: A pip.index.FormatControl object to limit
binaries being read from the cache.
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Return a directory to store cached wheels in for link.
Because there are M wheels for any one sdist, we provide a directory
to cache them in, and then consult that directory when looking up
cache hits.
We only insert things into the cache if they have plausible version
numbers, so that we don't contaminate the cache with things that were not
unique. E.g. ./package might have dozens of installs done for it and build
a version of 0.0...and if we built and cached a wheel, we'd end up using
the same wheel even if the source has been edited.
:param cache_dir: The cache_dir being used by pip.
:param link: The link of the sdist for which this will cache wheels.
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Yield all the uninstallation paths for dist based on RECORD-without-.pyc
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Return the Wheel-Version of an extracted wheel, if possible.
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Raises errors or warns if called with an incompatible Wheel-Version.
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ahead of what it's compatible with (e.g 2.0 > 1.1); and warn when
installing a version only minor version ahead (e.g 1.2 > 1.1).
version: a 2-tuple representing a Wheel-Version (Major, Minor)
name: name of wheel or package to raise exception about
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Return the lowest index that one of the wheel's file_tag combinations
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