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Date: Fri, 7 Mar 2014 18:16:55 +1100
Subject: Assertions are bad, m'kay?
From: Chris Angelico <rosuav@gmail.com>
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Xref: csiph.com comp.lang.python:67980

They produce the wrong exception type, they disappear when you least
expect them, and now we have another reason not to use assert.

http://xkcd.com/1339/

Abusing assert for arg checking violates XKCD 1339. Write
standards-compliant code!

ChrisA