先在pythonista新建一个文件，代码如下：
def break_words(stuff):
"""This fuction 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):
"""Print the first word ofter popping it off."""
word = words.pop(0)
print(word)
def print_last_word(words):
"""Prints the last word after poppint 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)
运行一下上述代码，如果你的代码输入没有错误的话，不会输出任何东西。
接下来你转到console窗口，
如果你输入dir()（列出当前活动的函数)会列出下面内容：
>>> dir()
['__annotations__', '__builtins__', '__cached__', '__doc__', '__loader__', '__name__', '__package__', '__spec__', 'break_words', 'print_first_and_last', 'print_first_and_last_sorted', 'print_first_word', 'print_last_word', 'sort_sentence', 'sort_words']
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