Python's advanced features 3: the Magical __call__

__call__ is a fantastic feature, as long as there is a __call__ method in a type, we can use this type of object as a function.

Perhaps the more abstract, for example, will understand.

In [107]: F = Absin [108]: F ( -10) out[108]: Ten in[109]: dir (f) out[109]: [  '__call__'__class__ ' __delattr__ '  '__dir__',...]

The F object in the example above points to the ABS type, since F (-10) implements an overload of ABS (-10) due to the __call__ method in the F object.

PS: Since the variable/object/instance can point to a function, and the function can accept the variable, it can be seen that the function can accept another function as an argument, so __call__ implements the adorner's foundation.

Python's advanced features 3: the Magical __call__