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Requirements file parsing
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( ( ( ( ( (r# r7 Fr8 sessionr finderr r+ r* r- c # K t | }t || }| | | D ]}t |||| }||V dS )aq Parse a requirements file and yield ParsedRequirement instances.
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:param options: cli options.
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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.
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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
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effect are from SUPPORTED_OPTIONS. Options from SUPPORTED_OPTIONS_REQ may
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requirement file is `${MY_VARIABLE_1}` to ensure two things:
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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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