class A:
    def __init__(self, x):
        print("Calling __init__")
        self.x = x

def mynew(cls, *args, **kwargs):
    print("Calling mynew")
    return object.__new__(cls)

A.__new__ = mynew
A(10) 

A.__new__ = lambda cls, x: object.__new__(cls)
a = A(10)  
print(a.x)