今天还是阅读代码。

def break_words(stuff):
 """This function will break up words for us."""
 words = stuff.split(' ')
 return words
def sort_words(words):
 """Sorts the words."""
 return sorted(words)
def print_first_word(words):
 """Prints the first word after popping it off."""
 word = words.pop(0)
 print word
def print_last_word(words):
 """Prints the last word after popping it off."""
 word = words.pop(-1)
 print word
def sort_sentence(sentence):
 """Takes in a full sentence and returns the sorted words."""
 words = break_words(sentence)
 return sort_words(words)
def print_first_and_last(sentence):
 """Prints the first and last words of the sentence."""
 words = break_words(sentence)
 print_first_word(words)
 print_last_word(words)
def print_first_and_last_sorted(sentence):
 """Sorts the words then prints the first and last one."""
 words = sort_sentence(sentence)
 print_first_word(words)
 print_last_word(words)

一堆函数，这是个模版，使用的时候import就好。
如果输入help( )，即得到""" """里面的东西。
明天会将这本书后面几章给学了，再不学感觉这礼拜就过去了。