Introduction to the use of __call__ method in python (with examples)

This article brings you an introduction to the use of the __call__ method in python (with examples). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

If a class in Python defines the __call__ method, then its instance of this class can be called as a function, that is, it implements the () operator and can call the object protocol

The following is a simple example:

class TmpTest:
    def __init__(self, x, y):
        self.x = x
        self.y = y

    def __call__(self, x, y):
        self.x, self.y = x, y


a = TmpTest(1, 2)
a(4, 5)
print(a.x, a.y)

In this article, we will not discuss the decoration part. We will use the decorator to explain the use of a __call__ method. If you need to use a class as a decorator, you need to provide this Class implements __call__ method, an example of using __call__ to implement class decorator:

class TmpTest:
    def __init__(self, func):
        self.func=func
    def __call__(self, *args,**kwargs):
        result=self.func(*args,**kwargs)
        return result
@TmpTest
def add_num(x,y):
    return x+y

print(add_num(1,0))

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