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

Tim Peters tim.one@comcast.net
Fri, 26 Apr 2002 13:27:37 -0400

[Tim]

Yup, good point, 'None' does make sense as the first NAME in the dottedname production.

[Guido]

No, dottedname is only used in import statements.

[Jeremy]

None is a valid package name.

But it won't be when None becomes a keyword. We shouldn't change the grammar now anyway, so let's fight instead about which names should become keywords eventually (== which should generate warnings in 2.3 for non-rvalue uses).

import string import builtin

candidates = [k for k in dir(builtin) if k[0] in string.ascii_uppercase and not k.endswith('Error') and not k.endswith('Warning')]

for k in candidates: print k

displays:

Ellipsis
Exception
False
KeyboardInterrupt
None
NotImplemented
StopIteration
SystemExit
True

in current CVS.

Ellipsis
False
None
NotImplemented
True

are the builtin singleton data constants, so I'm +1 on those. The others are exception classes; -0 from me.