Update for new exception syntax.
Review Request #4876 — Created Nov. 1, 2013 and submitted
Update for new exception syntax.
Python 2.6+ introduced a new syntax for catching exceptions with the exception
value. Instead of "except Exception, e", it's now "except Exception as e",
which is really much nicer. Since we're 2.6+ only now, we can convert to this.Testing done: Ran unit tests.
Ran unit tests.
