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From: Peter Otten <__peter__@web.de>
Subject: Re: TypeError: unbound method add() must be called with BinaryTree instance as first argument (got nothing instead)
Date: Sat, 18 May 2013 21:46:38 +0200
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Xref: csiph.com comp.lang.python:45528

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.