Igor Vasilyev wrote:
class A():
def __add__(self, var):
print("I'm in A class")
return 5
a = A()
a+1
1+a
Execution:
python test.py
I'm in A class
Traceback (most recent call last):
File "../../test.py", line 7, in <module>
1+a
TypeError: unsupported operand type(s) for +: 'int' and 'instance'
You need to define an __radd__ method for it to work
as a right-hand operand.
When we adding class to integer we have both slotv and slotw. x =
slotv(v, w); -> returns Py_NotImplemented.
But in this case we should execute x = slotw(v, w);
Yes, but the wrapper that gets put in the type slot calls
__rxxx__ instead of __xxx__ if it's being called for the
right-hand operand.
--
Greg
_______________________________________________
Python-Dev mailing list
Python-Dev@python.org
https://mail.python.org/mailman/listinfo/python-dev
Unsubscribe:
https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
