class puk:
def __init__(self):
puk.lst = []
def add(self, a):
puk.lst.append(a)
x = puk()
x.add(123)
print(x.lst, puk.lst)
Y2xhc3MgcHVrOgoJZGVmIF9faW5pdF9fKHNlbGYpOgoJCXB1ay5sc3QgPSBbXQoKCWRlZiBhZGQoc2VsZiwgYSk6CgkJcHVrLmxzdC5hcHBlbmQoYSkKCnggPSBwdWsoKQp4LmFkZCgxMjMpCnByaW50KHgubHN0LCBwdWsubHN0KQ==