code: def _expected_reads(run_info_file):
      
      reads = []
      if os.path.exists(run_info_file):
          tree = ElementTree()
          tree.parse(run_info_file)
          read_elem = tree.find("Run/Reads")
          reads = read_elem.findall("Read")
      return len(reads)
docs: Parse the number of expected reads from the RunInfo.xml file.