On 19 September 2011 12:11, Henrik Faber <hfa...@invalid.net> wrote: > Hi there, > > when I have a python class X which overloads an operator, I can use that > operator to do any operation for example with an integer > > y = X() + 123 > > however, say I want the "+" operator to be commutative. Then > > y = 123 + X() > > should have the same result. However, since it does not call __add__ on > an instance of X, but on the int 123, this fails: > > TypeError: unsupported operand type(s) for +: 'int' and 'X' > > How can I make this commutative?
Overload X.__radd__() as well HTH -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
