Update exception syntax to be py3 compat
Update exception syntax to be py3 compat

dropbox/changes,bowlofstew/changes,bowlofstew/changes,wfxiang08/changes,dropbox/changes,bowlofstew/changes,wfxiang08/changes,dropbox/changes,bowlofstew/changes,dropbox/changes,wfxiang08/changes,wfxiang08/changes