>> Dan Bishop wrote: >>> def cmp_key(cmp_fn):
>>> class CmpWrapper(object): >>> def __init__(self, obj): >>> self.obj = obj >>> def __cmp__(self, other): >>> return cmp_fn(self.obj, other.obj) >>> return CmpWrapper > On Mar 13, 12:38 pm, Alan Isaac wrote: >> how is this supposed to work if __cmp__ is no longer >> being called? (Which was my understanding.) Carl Banks wrote: > It won't. In Python 3.0 you'd have to write this class in terms of > rich comparisons (__lt__, __gt__, etc.). Exactly. So something simple (define an anonymous function) has become a bit of a pain. On the other hand, I've looked through my extant code and have not found a use of ``cmp`` that I cannot work around. So maybe this is not as bad as I feared. What are some use cases that will clearly be harder (i.e., at least require a slightly elaborate wrapper) after this change? Cheers, Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list