Question

我一直在学习'以艰难的方式学习Python'，这段特殊的代码给我带来了很多麻烦：

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 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 = brea_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)

导入模块后，我收到错误：

>>> import ex25
>>> sentence = "All good things come to those who wait."
>>> words = ex25.break_words(sentence)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "ex25.py", line 4, in break_words
    return words
NameError: global name 'words' is not defined

我哪里出错了？我检查了数百万次代码......

Answer 1

您是否尝试过

reload(ex25)

？如果导入文件，然后更改该文件，则python进程不知道您已更改它。您必须重新启动，或者让它再次查看模块。

Answer 2

正如我在评论中所说，我认为你的pyc文件是导入的，而不是你的py代码。

Answer 3

假设上面的答案已经足够了 - 您需要重新加载模块。在NFS文件系统上，我发现在更改之后没有重新编译的python代码（使用了旧的pyc文件）时遇到了麻烦。如果'reload'不起作用，您可以尝试删除pyc文件并重新启动python。

  ddzialak@pld ~$ python
  Python 2.7.2 (default, Aug 16 2011, 10:09:58)
  [GCC 4.6.1 20110714 (release)] on linux2
  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)
  >>> print words
  ['All', 'good', 'things', 'come', 'to', 'those', 'who', 'wait.']

python语法mess：name未定义

3 个答案: