如何在Python中检查函数类型? [英] How to check for a function type in Python?

问题描述

我有一个东西清单，其中一些也可以是函数.如果它是一个函数，我想执行它.为此，我进行了类型检查.这通常适用于其他类型，例如str，int或float.但是对于某个功能，它似乎不起作用:

I've got a list of things, of which some can also be functions. If it is a function I would like to execute it. For this I do a type-check. This normally works for other types, like str, int or float. But for a function it doesn't seem to work:

>>> def f():
...     pass
... 
>>> type(f)
<type 'function'>
>>> if type(f) == function: print 'It is a function!!'
... 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'function' is not defined
>>>

有人知道我如何检查函数类型吗?

Does anybody know how I can check for a function type?

推荐答案

不要检查类型，请检查操作.您实际上并不在乎它是否是一个函数(例如，它可能是带有__call__方法的类实例)-您只在乎是否可以调用它.因此，请使用callable(f).

Don't check types, check actions. You don't actually care if it's a function (it might be a class instance with a __call__ method, for example) - you just care if it can be called. So use callable(f).

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