code: def evaluate_marker(text, extra=None):
      
      try:
          marker = packaging.markers.Marker(text)
          return marker.evaluate()
      except packaging.markers.InvalidMarker as e:
          raise SyntaxError(e)
docs: Evaluate a PEP 508 environment marker.
      Return a boolean indicating the marker result in this environment.
      Raise SyntaxError if marker is invalid.
  
      This implementation uses the 'pyparsing' module.