Exercise 25: Even More Practice

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)

if __name__ == '__main__':
　　sentence = "All good things come to those who wait."

pop() 出栈。