+= append class operator

[Fredrik Lundh]

schwehr at gmail.com wrote:

> This is probably a FAQ, but is there an operator mapping for += for
> classes?

     obj.__iadd__(other)

> Or does a += b get converted to a = a + b?

only if __iadd__ is not defined.

> I would like to make this operator faster for the BitVector class, but
> I don't see += in http://docs.python.org/lib/operator-map.html

that's documentation for the operator module.

special method names are described in the language reference:

    http://docs.python.org/ref/specialnames.html
    http://docs.python.org/ref/numeric-types.html

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