没有名为的模块（导入错误Python 2.7）

我试图通过遵循每一个步骤来解决“学习Python”中的练习25，但我一直遇到以下错误：

>>> import ex25
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named ex25

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@Padraic Cunningham和@James Mills提出了正确的问题，您只是得到了一个导入错误，没有什么可以暗示代码错误。您需要确保文件存在于您正在使用的目录中。请记住，它是区分大小写的

,，

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您是否将文件另存为

ex25.py

？您是否与

ex25.py

位于同一目录下？Padraic是正确的。我是一个Ubuntu新手，你可以从终端运行一个脚本而不用写“.py”，这让我觉得我不必首先将它保存为“.py”。谢谢你的回答。

   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)