Operator overloading and __getattr__

Samuel Kleiner sam at h41n2fls31o839.telia.com
Tue Dec 23 17:53:03 CET 2003

Bengt Richter wrote:
> On Mon, 22 Dec 2003 10:03:03 -0600, Samuel Kleiner <sam at h41n2fls31o839.telia.com> wrote:
>>I'm trying to create methods on method access- but __getattr__ fails
>>with operator overloading(below) Any suggestions? EG:
> First please explain why you are trying to do whatever it is you're trying to do ;-)

I was trying to automatically extend M to cover all binary operators not
covered by dict, preferably without assigning to them all.

class M(dict):
    def __add__(self, add):
        if type(add) in self:            
        return self

    def __str__(self):
        return "+".join(map(str,self.values()))

print M()+"foo"+2+"bar"+5

>>Causes TypeError on the last line
> I doubt if that's the first problem ;-)

Yes, I was jetlagged. new.instancemethod seems the way to go, really.

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