[Pythonmac-SIG] string ids

[Feat]

I thought a string was stored as a unique object, so why isn't this evidenced by the code below ?

	Python 2.5.2 (r252:60911, Feb 22 2008, 07:57:53) 
	[GCC 4.0.1 (Apple Computer, Inc. build 5363)] on darwin
	>>> [light is 'green' for light in 'green', 'red']
	[True, False]
	>>> color = 'green'
	>>> [light is 'green' for light in 'green', 'red']
	[False, False]
	>>> color = 1
	>>> [light is 'green' for light in 'green', 'red']
	[True, False]

whereas:

	>>> [x is 1 for x in 1, 2]
	[True, False]

whether the value 1 is assigned to some other variable or not... the id of 1 doesn't vary -- just what is the rationale behind that?

I know I could use the == predicate instead, but just how many different greens (with different ids) can  there be, and how do I know which one is under focus at a given time?

-- 
Jym Feat ~ Paris FR 75018