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Download packages from:
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- Local project directories.
- Local or remote source archives.
pip also supports downloading from "requirements files", which provide
an easy way to specify a whole environment to be downloaded.
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%prog [options] <requirement specifier> [package-index-options] ...
%prog [options] -r <requirements file> [package-index-options] ...
%prog [options] <vcs project url> ...
%prog [options] <local project path> ...
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