Question

我正在阅读电子书“以艰难的方式学习python”在示例25中，我将所有内容编码正确但是当我尝试在powershell中加载文件时，没有任何内容出现。没有错误或任何东西，但文件剂量加载。它还说在你发现所有错误之后在python中加载它，但它也在那里加载。我的错误可能是什么？为什么不加载？

这是我的代码：

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 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)

Answer 1

该文件已导入示例中的shell并运行如下，重要的是从python shell而不是powershell运行：

>>> import ex25 # import file
>>> sentence = "All good things come to those who wait." # create variable sentence
>>> words = ex25.break_words(sentence) # create variable words
>>> words # input 
['All', 'good', 'things', 'come', 'to', 'those', 'who', 'wait.'] # output
>>> sorted_words = ex25.sort_words(words) # create `sorted_words` variable using `sort_words` method
>>> sorted_words # 
['All', 'come', 'good', 'things', 'those', 'to', 'wait.', 'who'] # output
>>> ex25.print_first_word(words) # call `print_first_word` method
All  # output
>>> ex25.print_last_word(words) # call `print_last_word` method
wait. # output

在保存py文件的同一目录中打开一个shell并运行上面的命令，不要输入>>>，这只是示例

的shell输出的一部分

如果您想在使用python ex25.py if __name__== "__main__"的PowerShell运行脚本时输出：

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 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)
if __name__=="__main__":
      sentence = "All good things come to those who wait." # create variable sentence
      words = break_words(sentence) # create variable words
      print words # input

      sorted_words = sort_words(words) # create `sorted_words` variable using `sort_words` method
      print sorted_words #

      print_first_word(words) # call `print_first_word` method

      print_last_word(words) # call `print_last_word` method

Answer 2

您已在文件中定义了一堆函数。你期望看到什么输出？

如果您想查看任何内容，则需要执行其中一个过程。例如......

break_words('foo bar')

Answer 3

在书中找一个主要的＆＃39;与功能一起使用的程序。它可能在另一页左右。您可能只加载了这些函数。

我尝试加载python文件时没有显示任何内容

3 个答案: