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Requirements file parsing
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>r" c ~ | j rt | | }|S t | j | j | j ||| dS )a Handle a single parsed requirements line; This can result in
creating/yielding requirements, or updating the finder.
:param line: The parsed line to be processed.
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:param session: The session - updated by non-requirement lines.
Returns a ParsedRequirement object if the line is a requirement line,
otherwise returns None.
For lines that contain requirements, the only options that have an effect
are from SUPPORTED_OPTIONS_REQ, and they are scoped to the
requirement. Other options from SUPPORTED_OPTIONS may be present, but are
ignored.
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effect are from SUPPORTED_OPTIONS. Options from SUPPORTED_OPTIONS_REQ may
be present, but are ignored. These lines may contain multiple options
(although our docs imply only one is supported), and all our parsed and
affect the finder.
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r N)r subr )rR r rT s r rP rP s` ( $ $ T~~b$''zz|| $ t# # # # $ $r" c # K | D ]X\ }}t | D ]2\ }}t j | }|s | || }3||fV YdS )a Replace all environment variables that can be retrieved via `os.getenv`.
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requirement file is `${MY_VARIABLE_1}` to ensure two things:
1. Strings that contain a `$` aren't accidentally (partially) expanded.
2. Ensure consistency across platforms for requirement files.
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