Removing None objects from a sequence

[Steve Holden]

Kirk Strauser wrote:
> At 2008-12-12T15:51:15Z, Marco Mariani <marco at sferacarta.com> 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?

"is not" is an operator, so the parse is

foo (is not) None

not

foo is (not None)

regards
 Steve
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