__call__ in Python
Last Updated :
27 Feb, 2020
Python has a set of built-in methods and __call__ is one of them. The __call__ method enables Python programmers to write classes where the instances behave like functions and can be called like a function. When the instance is called as a function; if this method is defined, x(arg1, arg2, ...) is a shorthand for x.__call__(arg1, arg2, ...).
object() is shorthand for object.__call__()
Example 1:
class Example:
def __init__(self):
print("Instance Created")
def __call__(self):
print("Instance is called via special method")
e = Example()
e()
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Output :
Instance Created
Instance is called via special method
Example 2:
class Product:
def __init__(self):
print("Instance Created")
def __call__(self, a, b):
print(a * b)
ans = Product()
ans(10, 20)
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Output :
Instance Created
200
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