docs: def assign_colors(dir_counts):
      '''Defines the color of a word in the cloud.
      Counts is a list of tuples in the form (word,occurences)
      The more files a word occurs in, the more red it appears in the cloud.'''
      frequencies = map(lambda x: x[1],dir_counts)
      words = map(lambda x: x[0],dir_counts)
      maxoccur = max(frequencies)
      minoccur = min(frequencies)
      colors = map(lambda x: colorize(x,maxoccur,minoccur),frequencies)
      color_dict = dict(zip(words,colors))
      return color_dict