Do we want to try enforcing pep 3110 and use as in every exceptions that uses , ?
use explicit tuple in exception
Yes, I think we should follow pep 3110. There may be more of these small errors lying around. I'll merge this fix now, thanks!
backported to 0.13.1 from PR #2061
Backport PR #2061: use explicit tuple in exception
Do we want to try enforcing [pep 3110](http://www.python.org/dev/peps/pep-3110/) and use `as` in every exceptions that uses `,` ?