Assigning to None (was Re: Question about Python)

Steven D'Aprano steve at
Sun Jul 3 03:47:07 CEST 2005

On Fri, 01 Jul 2005 12:59:20 -0400, François Pinard wrote:

> [Peter Hansen]
>> Mike Meyer wrote:
>> > Yes. I once grabbed an old program that did assignments to None. But
>> > that's always been a bad idea.
>> What was the use case!?
> People used to assign None to itself as a keyword argument in function
> headers.  The goal was to make a local copy of the reference, which was
> then accessed faster than the global thing.

Can you say "premature optimization is the root of all evil"?

I'd like to see the profiling that demonstrated that this made a
significant -- or even measurable -- speed-up in anything but the most
unusual cases.


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