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Requirements file parsing
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Vq�WqOWdS(s�Parse a requirements file and yield InstallRequirement instances.

    :param filename:    Path or url of requirements file.
    :param finder:      Instance of pip.index.PackageFinder.
    :param comes_from:  Origin description of requirements.
    :param options:     cli options.
    :param session:     Instance of pip.download.PipSession.
    :param constraint:  If true, parsing a constraint file rather than
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    :param wheel_cache: Instance of pip.wheel.WheelCache
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cC@sCt|j�dd�}t|�}t|�}t||�}|S(s�Split, filter, and join lines, and return a line iterator

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j9D��qPndS(s#Process a single requirements line; This can result in creating/yielding
    requirements, or updating the finder.

    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.

    For lines that do not contain requirements, the only options that have an
    effect are from SUPPORTED_OPTIONS. Options from SUPPORTED_OPTIONS_REQ may
    be present, but are ignored. These lines may contain multiple options
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    affect the finder.

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    Skip lines that match '--skip-requirements-regex' pattern

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