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我曾尝试按照“艰难学习 Python”的步骤编写一个程序。这是练习 25。在额外学分中，它告诉我去做help(ex25)，但是当我输入该内容时，我在 linux mint 15 终端上得到了这个：
bash: syntax error near unexpected token `ex25'
请帮忙。这是我的编码：
def break_words(stuff):
"""this function will break-up words for us"""
words = stuff.split(' ')
return words
def sort_words(words):
"""sort the words"""
return sorted(words)
def prints_first_word(words):
"""prints the first word after popping it"""
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 whole sentence and sorts it"""
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)
prints_first_word(words)
print_last_word(words)
def print_first_and_last_sorted(sentence):
"""first sorts the words, then prints them"""
words = sort_sentence(sentence)
prints_first_word(words)
print_last_word(words)
答案1
我快速阅读了该示例http://learnpythonthehardway.org/book/ex25.html从你的帖子来看，听起来你是help(ex25)在 bash 提示符下输入，而你应该在完成第一步后在 python 解释器中输入该内容import ex25。