On Fri, 05 Feb 2010 16:52:19 +0100, mk wrote: > assert isinstance(cmd, basestring) or cmd is None, "cmd should be string > or None"
Do not use assertions for input validation. That's not what they're for. assert is compiled away when you run your code with the -O switch, which means that the test may never be made at all. You should limit assertions for testing "this can never happen" situations, verifying pre- and post- conditions, checking the internal logic of your code, and similar. See also: http://nedbatchelder.com/text/assert.html -- Steven -- http://mail.python.org/mailman/listinfo/python-list
