• • 此问题在此处已有答案**：

Importing installed package from script with the same name raises "AttributeError: module has no attribute" or an ImportError or NameError（2个答案）
14小时前关门了。
As a hobby/learning project, I'm writing a parser generator in Python. One of my code files is named "token.py" - which contains a couple of classes for turning plain strings into Token objects. I've just discovered that using the "help()" function from the console in Python raises an error for any module defined in a directory that contains a "token.py".
以下是重现错误的方法。创建包含以下文件的新目录：

/New Folder
  main.py
  token.py

Leave 'token.py' blank. In main.py, write a simple function - for example:

def test():
    pass

然后，在Python控制台中，导入'main'并调用'help（main.test）'--下面是您将得到的结果：

C:\New Folder>python
Python 3.1.1 (r311:74483, Aug 17 2009, 17:02:12) [MSC v.1500 32 bit (Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import main
>>> help(main.test)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Python31\lib\site.py", line 428, in __call__
    import pydoc
  File "C:\Python31\lib\pydoc.py", line 55, in <module>
    import sys, imp, os, re, inspect, builtins, pkgutil
  File "C:\Python31\lib\inspect.py", line 40, in <module>
    import tokenize
  File "C:\Python31\lib\tokenize.py", line 37, in <module>
    COMMENT = N_TOKENS
NameError: name 'N_TOKENS' is not defined
>>>

如果你删除了'token.py'文件，help（）将正常工作，Python 3.1和Python 2.5都有这种行为。
这是已知问题吗？如果不是，我如何报告？
编辑：
Several comments state that this behavior isn't a bug. The module that defines "help" imports a module called "token" from Python's standard library. However, Python looks in the application folder before it looks in its library to find modules. In the example above, "help" tries to use my "token.py" instead of Python's, which causes the error.
由于Python被定义为表现这种行为，我想这不是一个bug。但是为什么人们认为这种行为是可以接受的呢？这意味着向Python库中添加新模块--即使不更改现有模块--也可能破坏现有应用程序。这还意味着程序员应该记住Python库中所有模块的名称--这比期望程序员记住. NET或Java中的每个名称空间更荒谬吗？为什么Python应用程序没有自己的名称空间？为什么Python标准库模块不在自己的名称空间中？