> My preference would be to limit sum() to value addition only, and never do
> concatenation.
I would be happy with that, provided there was join function and operator:
>>> join = lambda x: reduce(lambda y, z: y.__join__(z), x)
I think this is clearer than sum():
>>> join(['a', 'b', 'c'])
'abc'
It wouldn't interfere with ''.join(), and ''.__add__() could be
redirected to ''.__join__().
> For all non numeric types it would generate an exception.
How about generating an exception where __add__ isn't defined, so it
would work on MyFunkyVector type. I could join my vectors together as
well, since in MyNonEucledeanSpace, it doesn't mean the same thing as "add".
Joel
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