code: def parseColors(colors, defaultColor):
      
      result = []
      if colors:
          for colorInfo in colors:
              fields = colorInfo.split(maxsplit=1)
              if len(fields) == 2:
                  threshold, color = fields
                  try:
                      threshold = float(threshold)
                  except ValueError:
                      print('--color arguments must be given as space-separated '
                            'pairs of "value color" where the value is a '
                            'numeric identity threshold. Your value %r is not '
                            'numeric.' % threshold, file=sys.stderr)
                      sys.exit(1)
                  if 0.0 > threshold > 1.0:
                      print('--color arguments must be given as space-separated '
                            'pairs of "value color" where the value is a '
                            'numeric identity threshold from 0.0 to 1.0. Your '
                            'value %r is not in that range.' % threshold,
                            file=sys.stderr)
                      sys.exit(1)
  
                  result.append((threshold, color))
              else:
                  print('--color arguments must be given as space-separated '
                        'pairs of "value color". You have given %r, which does '
                        'not contain a space.' % colorInfo, file=sys.stderr)
                  sys.exit(1)
  
      result.sort(key=itemgetter(0), reverse=True)
  
      if not result or result[-1][0] > 0.0:
          result.append((0.0, defaultColor))
  
      return result
docs: Parse command line color information.
  
      @param colors: A C{list} of space separated "value color" strings, such as
          ["0.9 red", "0.75 rgb(23, 190, 207)", "0.1 #CF3CF3"].
      @param defaultColor: The C{str} color to use for cells that do not reach
          the identity fraction threshold of any color in C{colors}.
      @return: A C{list} of (threshold, color) tuples, where threshold is a
          C{float} (from C{colors}) and color is a C{str} (from C{colors}). The
          list will be sorted by decreasing threshold values.