code: def countGaps(btopString):
      
      queryGaps = subjectGaps = 0
      for countOrMismatch in parseBtop(btopString):
          if isinstance(countOrMismatch, tuple):
              queryChar, subjectChar = countOrMismatch
              queryGaps += int(queryChar == '-')
              subjectGaps += int(subjectChar == '-')
  
      return (queryGaps, subjectGaps)
docs: Count the query and subject gaps in a BTOP string.
  
      @param btopString: A C{str} BTOP sequence.
      @raise ValueError: If L{parseBtop} finds an error in the BTOP string
          C{btopString}.
      @return: A 2-tuple of C{int}s, with the (query, subject) gaps counts as
          found in C{btopString}.