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:param options: cli options.
:param session: Instance of pip.download.PipSession.
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r8 c c sL | D ]B\}}t |D ]$\}}t|}|s.q|||}q||fV qdS )a Replace all environment variables that can be retrieved via `os.getenv`.
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1. Strings that contain a `$` aren't accidentally (partially) expanded.
2. Ensure consistency across platforms for requirement files.
These points are the result of a discussion on the `github pull
request #3514 `_.
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