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From: Terry Jan Reedy <tjreedy@udel.edu>
Subject: Re: TypeError: unbound method add() must be called with BinaryTree instance as first argument (got nothing instead)
Date: Sat, 18 May 2013 17:05:57 -0400
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Xref: csiph.com comp.lang.python:45530

On 5/18/2013 3:46 PM, Peter Otten wrote:
> Dan Stromberg wrote:
>
>> python 2.x, python 3.x and pypy all give this same error, though jython
>> errors out at a different point in the same method.
>
> By the way, 3.x doesn't have unbound methods, so that should work.

It does for this example (3.3.1)
 >>> c = C()
 >>> c.m()
<__main__.C object at 0x00000000033FC5F8>
 >>> C.m(c)
<__main__.C object at 0x00000000033FC5F8>
 >>> C.m(self=c)
<__main__.C object at 0x00000000033FC5F8>