更多更多的练习
- 输入：
# -*- coding: utf-8 -*-
def break_words(stuff):
"""This function will break up words for us."""
words = stuff.split(' ')
#Python split()通过指定分隔符对字符串进行切片，
#如果参数num 有指定值，则仅分隔 num 个子字符串。
return words
def sort_words(words):
"""Sorts the words."""
return sorted(words)
#sorted是一种排序功能，这里是讲words的内容进行排序
def print_first_word(words):
"""Prints the first word after popping it off."""
word = words.pop(0)
#pop() 函数用于移除列表中的一个元素（默认最后一个元素），
#并且返回该元素的值。这里的0代表第一个元素
print word
def print_last_word(words):
"""Prints the last word after popping it off."""
word = words.pop(-1) #移除最后一个元素，并返回该元素的值
print word
def sort_sentence(sentence):
"""Takes in a full sentence and returns the sorted words."""
words = break_words(sentence)
#将上面已经移除第一个元素和最后一个元素的值赋予words
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)
-运行：
这段眼花缭乱的代码，试了好几次才完全输入正确并运行成功。。。
