Hrvoje Niksic <[EMAIL PROTECTED]> wrote: > [EMAIL PROTECTED] writes: > >> Right, the paragraph is actually pretty clear after a second >> reading. I find it surprising nonetheless, as it's easy to forget >> to return a result when you're implementing a method that does an >> in-place operation, like __iadd__: > > I've recently been bitten by that, and I don't understand the > reasoning behind __iadd__'s design. I mean, what is the point of an > *in-place* add operation (and others) if it doesn't always work > in-place? > A very common use case is using it to increment a number:
x += 1 If += always had to work inplace then this would throw an exception: an inplace addition would be meaningless for Python numbers. -- http://mail.python.org/mailman/listinfo/python-list
