code: def parse_coverage(coverage_report, parser):
      
      if parser in PARSERS:
          if coverage_report:
              return PARSERS[parser].parse_coverage_report(coverage_report)
          return None
      return NotImplemented
docs: :param coverage_report: A string with the contents of a coverage file
      :type coverage_report: String
      :param parser: A string with name of the parser to use
      :type parser: String
      :return: Total coverage