class Foo():
def __init__(self,v):
self.v = v
def __set_name__(self, owner, name):
print(f'{owner.__name__} setting "{name}" to Foo({self.v})')
class Bar():
a = Foo('1')
b = Foo('2')
c = Foo('3')
class Baz(Bar):
d = Foo('4')