boto/boto — pull request #1085 by staer (2012-10-28 14:14:23+00:00)
Title: Add __future__ import of with_statement for < python2.5 compat

After looking through the source it looks like the only two places that use the 'with' statement without a "from __future__ import with_statement" are in glacier. This should take care of those two cases making glacier work from Python2.5 or earlier, Jython, etc.