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Requirements file parsing
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(r* r4 r6 sessionfinderr r! r r# c # # [ U5 n[ X5 nUR X5 H n[ XsX!S9nUc M Uv M g7f)aU Parse a requirements file and yield ParsedRequirement instances.
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UUU5 g)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
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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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Ac # # U HX u p[ R U5 H5 u p4[ R " U5 nU( d M$ UR X55 nM7 X4v MZ g7f)a Replace all environment variables that can be retrieved via `os.getenv`.
The only allowed format for environment variables defined in the
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.
These points are the result of a discussion on the `github pull
request #3514 `_.
Valid characters in variable names follow the `POSIX standard
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to uppercase letter, digits and the `_` (underscore).
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