Re: [Python-Dev] Why does Signature.from_function() have to check the type of its argument?

2013/2/8 Stefan Behnel <stefan_ml@behnel.de>:

Hi,

I'm wondering about the purpose of this code in inspect.Signature.from_function():

""" if not isinstance(func, types.FunctionType): raise TypeError('{!r} is not a Python function'.format(func)) """

Is there any reason why this method would have to explicitly check the type of its argument? Why can't it just accept any object that quacks like a function?

The signature() function checks for types.FunctionType in order to call Signature.from_function(). How would you reimplement that? -- Regards, Benjamin