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最近在學習python，其中遇到一道習題是改錯的。

原代碼如下

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)

他要求的輸出如下：

$ python

Python 2.5.1 (r251:54863, Feb 6 2009, 19:02:12)

[GCC 4.0.1 (Apple Inc. build 5465)] on darwin

Type "help", "copyright", "credits" or "license" for more information.

>>> import ex25

>>> sentence = "All good things come to those who wait."

>>> words = ex25.break_words(sentence)

>>> words

['All', 'good', 'things', 'come', 'to', 'those', 'who', 'wait.']

>>> sorted_words = ex25.sort_words(words)

>>> sorted_words

['All', 'come', 'good', 'things', 'those', 'to', 'wait.', 'who']

>>> ex25.print_first_word(words)

All

>>> ex25.print_last_word(words)

wait.

>>> wrods

Traceback (most recent call last):

File "", line 1, in

NameError: name 'wrods' is not defined

>>> words

['good', 'things', 'come', 'to', 'those', 'who']

>>> ex25.print_first_word(sorted_words)

All

>>> ex25.print_last_word(sorted_words)

who

>>> sorted_words

['come', 'good', 'things', 'those', 'to', 'wait.']

>>> sorted_words = ex25.sort_sentence(sentence)

>>> sorted_words

['All', 'come', 'good', 'things', 'those', 'to', 'wait.', 'who']

>>> ex25.print_first_and_last(sentence)

All

wait.

>>> ex25.print_first_and_last_sorted(sentence)

All

who

>>> ^D

$

求高人幫我改改原輸入代碼，像上面輸出給我的感覺是他是不是在IDLE寫的？還有我用文本txt的方式編寫，然后通過python在cmd中運行的，最好能改成這種。

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