[Python-Dev] Making None a keyword (original) (raw)

Guido van Rossum guido@python.org
Thu, 25 Apr 2002 23:08:37 -0400

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I'd like to make None a keyword. This prevents dumb users from assigning to it and screwing themselves, and can cause a slight speedup because using None avoids two dict lookups.

• Any objections?

• Can somebody help me implement this? I've got the parser changes ready, but not the compiler changes.

Believe it or not, Zope3 contains code that will break with this change: there are functions with a default argument of the form None=None as a speedup hack. I think this is an argument for the change. :-)

--Guido van Rossum (home page: http://www.python.org/~guido/)

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