steve at REMOVE-THIS-cybersource.com.au
Fri Feb 5 23:19:11 CET 2010
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.
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