Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

>From implementation perspective it is not easy at all. You will need to create 
>a special class with methods __call__ and __getitem__ (and several other 
>methods and attributes, like __repr__, __reduce__, __name__, __doc__, 
>__module__, __text_signature__, etc) and make builtins.callable an instance 
>instead of just built-in function. It can also affect performance of 
>callable().

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42102>
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