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Make a filename relative, where the filename path, and it is
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'a-file.pth'
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Return a list of installed Distribution objects.
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skip virtualenv?]
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If ``editables_only`` is True , only report editables.
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Return the path for the .egg-link file if it exists, otherwise, None.
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try to find in site_packages
3) in a yes-global virtualenv
try to find in site_packages, then site.USER_SITE (don't look in global location)
For #1 and #3, there could be odd cases, where there's an egg-link in 2 locations.
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