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Parser for the environment markers micro-language defined in PEP 508.
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This class is used to evaluate marker expessions.
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Evaluate a marker expression returned by the :func:`parse_requirement`
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Interpret a marker and return a result depending on environment.
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:param marker: The marker to interpret.
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:type marker: str
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:param execution_context: The context used for name lookup.
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:type execution_context: mapping
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