> Using None might be problematic if None could be a valid argument.

That's like saying that NULL could be a significant value in SQL. In
Python, "None" *is* the empty, not significant value, and should always be
used as such. Specifically, never exchange "None" for "False".

-- 
Nicola Larosa - [EMAIL PROTECTED]

...Linux security has been better than many rivals. However, even
the best systems today are totally inadequate. Saying Linux is
more secure than Windows isn't really addressing the bigger issue
 - neither is good enough. -- Alan Cox, September 2005
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