调用元类基础时出错：function（）参数1必须是代码，而不是str [英] Error when calling the metaclass bases: function() argument 1 must be code, not str

问题描述

我试图子类化线程。条件今天早些时候，但它没有工作。这里是Python解释器的输出，当我尝试子类threading.Condition类：

I tried to subclass threading.Condition earlier today but it didn't work out. Here is the output of the Python interpreter when I try to subclass the threading.Condition class:

>>> import threading
>>> class ThisWontWork(threading.Condition):
...     pass
... 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: Error when calling the metaclass bases
    function() argument 1 must be code, not str

b $ b

有人可以解释这个错误吗？谢谢！

Can someone explain this error? Thanks!

推荐答案

你得到了那个异常，因为尽管它的类名，条件是一个函数，您不能子类化函数。

You're getting that exception because, despite its class-like name, threading.Condition is a function, and you cannot subclass functions.

>>> type(threading.Condition)
<type 'function'>

这个非常有用的错误消息在Python的bugtracker ，但它已被标记为不会修复。

This not-very-helpful error message has been raised on the Python bugtracker, but it has been marked "won't fix."

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