> Python 2.2 (#28, Mar 13 2002, 23:18:18) [MSC 32 bit (Intel)] on win32
> Type "help", "copyright", "credits" or "license" for more information.
> >>> coerce
> <built-in function coerce>
> >>> class ex(object):
> ... def __init__(self, v):
> ... self.v = v
> ... def __coerce__(self, other):
> ... return self, ex(other)
> ... def __add__(self, rhs):
> ... return ex(self.v + rhs.v)
> ... def __repr__(self):
> ... return 'ex(' + repr(self.v) + ')'
> ...
> >>> ex(3)
> ex(3)
> >>> coerce(ex(1),2.3)
> (ex(1), ex(2.2999999999999998))
> >>> ex(1).__add__(ex(2))
> ex(3)
> >>> ex(1)+2.3
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> File "<stdin>", line 9, in __add__
> AttributeError: 'float' object has no attribute 'v'
New-style classes don't support __coerce__. It's a long and sad
story, but basically __coerce__ was a mistake, and I've stopped
supporting it for new-style classes. This means that the + operator
doesn't call __coerce__. For some reason, coerce() still calls it;
maybe that was a mistake.
--Guido van Rossum (home page: http://www.python.org/~guido/)
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