#----------------------------------------------------------------------
def sort_by_length(word_list):
   """Sort the words in word_list in order of increasing length
      This is a slight modification of a function in Section
      12.7 of Allen Downey, Python for Software Design"""

   t_list = []
   for word in word_list:
      t_list.append((len(word), word))

   t_list.sort()

   new_list = []
   for length, word in t_list:
      new_list.append(word)
   return new_list