I saw this posted in the July issue but did not see any follow-up there: $ python Python 2.6.4 (r264:75706, Dec 7 2009, 18:43:55) [GCC 4.4.1] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> a = 500 >>> b = 500 >>> a == b True >>> a is b False >>> p = 50 >>> q = 50 >>> p == q True >>> p is q True >>>