Removing None objects from a sequence

Kirk Strauser kirk at
Fri Dec 12 17:08:23 CET 2008

At 2008-12-12T15:51:15Z, Marco Mariani <marco at> writes:

> Filip Gruszczyński wrote:
>> I am not doing it, because I need it. I can as well use "if not elem
>> is None",

> I suggest "if elem is not None", which is not quite the same.

So what's the difference exactly?  "foo is not None" is actually surprising
to me, since "not None" is True.  "0 is True" is False, but "0 is not None"
is True.  Why is that?
Kirk Strauser
The Day Companies

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