Which method is getting called for assignment in python class object?

Question

Here __call__ method is called when we write p2(p) then which method is called when we use p2 = p?

if we don't write __call__ then p2(p) creates an error and that is fine.

what if I want to disallow p2 = p?

class Point:

def __init__(self, x = 0, y = 0):
self.x = x
self.y = y

def __str__(self):
return "({0},{1})".format(self.x,self.y)

def __repr__(self):
return "({0},{1})".format(self.x,self.y)

def __add__(self,other):
x = self.x + other.x
y = self.y + other.y
return Point(x,y)

def __sub__(self,other):
x = self.x - other.x
y = self.y - other.y
return Point(x,y)

def __mul__(self,other):
x = self.x * other.x
y = self.y * other.y
return Point(x,y)

def __call__(self,other):
print("__call__")
self.x = other.x
self.y = other.y

p = Point(1,3)
p2 = Point()
p2(p)
print(p2)

Result:
__call__
(1,3)

Answer 1

You can't overload the assignment. However, you can overload the __setattr__ to restrict assigning new values to members of a class, if that suits you, instead.

Answer 2

I'm no Python expert, but completely agree with Kuba Siekierzyński after I did a little googling...

https://stackoverflow.com/questions/11024646/is-it-possible-to-overload-python-assignment

Answer 3

LONGTIE👔 John Wells Jan Markus Mitali Emerson Prado Modi Oma Falk The Coder Burey Kuba Siekierzyński

Need help here.

Answer 4

Kuba Siekierzyński Modi thanks