Python有一組內置方法，__call__是其中之一。的__call__ 方法使Python程序員可以編寫類，在這些類中，實例的行為類似於函數，可以像函數一樣調用。當實例作為函數調用時；如果定義了此方法，x(arg1, arg2, ...)是的簡寫x.__call__(arg1, arg2, ...)。
object() is shorthand for object.__call__()
範例1：
class Example:
def __init__(self):
print("Instance Created")
# Defining __call__ method
def __call__(self):
print("Instance is called via special method")
# Instance created
e = Example()
# __call__ method will be called
e()輸出：
Instance Created Instance is called via special method
範例2：
class Product:
def __init__(self):
print("Instance Created")
# Defining __call__ method
def __call__(self, a, b):
print(a * b)
# Instance created
ans = Product()
# __call__ method will be called
ans(10, 20)輸出：
Instance Created 200
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