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PEP 8, under 'Programming Recommendations' recommends against implicit
comparison to None. This isn't just stylistic, either: we were actually
bitten by it in the VMware driver
(https://bugs.launchpad.net/nova/+bug/1262288). The bug was hard to
spot, and had consequences to resource usage.

However, implicit comparison to None seems to be the default in Nova. Do
I give up mentioning this in reviews, or is this something we care about?

Matt
-- 
Matthew Booth, RHCA, RHCSS
Red Hat Engineering, Virtualisation Team

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