[PATCH] py3: use setattr() to assign new class attribute

[Yuya Nishihara]

On Tue, 17 May 2016 15:19:20 -0500, Pulkit Goyal wrote:
> # HG changeset patch
> # User Pulkit Goyal <7895pulkit at gmail.com>
> # Date 1463443356 -19800
> #      Tue May 17 05:32:36 2016 +0530
> # Node ID 3087d6aee6923479ce326fcbae4cfa7a261faab1
> # Parent  90d84e1e427a9d65aedd870cdb7283f84bb30141
> py3: use setattr() to assign new class attribute

Queued per MJ's review, thanks.