What is a functor in Python?

Can you explain what a functor is in Python?

Sure! In Python, a functor is an object that can be called as if it were a function. It's typically implemented using the __call__ method.

Can you give me an example of a functor?

Absolutely! Here's a simple example:

class Functor:
    def __call__(self, x):
        return x * 2

f = Functor()
print(f(5))  # Output: 10

How is a functor different from a regular function?

A functor is an instance of a class that implements the __call__ method, allowing it to be called like a function, while a regular function is defined using the def keyword.

When would I use a functor in Python?

Functors can be useful when you want to maintain state or encapsulate behavior in an object while still providing a callable interface.