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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`
function in the specified context.
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Interpret a marker and return a result depending on environment.
:param marker: The marker to interpret.
:type marker: str
:param execution_context: The context used for name lookup.
:type execution_context: mapping
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