[Pythonmac-SIG] string ids

[Feat]

The only way to ensure it will *always* work is when sharing values:

	Python 2.5.2 (r252:60911, Feb 22 2008, 07:57:53) 
	[GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
	>>> c1 = 'red' ; c2 = 'green' ; colors = (c1, c2)
	>>> [x is c2 for x in colors]
	[False, True]

Any new list will break the identity:

	>>> [x is c2 for x in 'red green'.split()] 
	[False, False]
	>>> [x is 'green' for x in 'red green'.split()]
	[False, False]

I'm baffled...