Works fine for me, Lou:
Python 0.9.6 (>= 1 Jan 1992).
Copyright 1990, 1991, 1992 Stichting Mathematisch Centrum, Amsterdam
>>> a = [2,'abc']
>>> (a is a)
This is a UNIX(tm) flavor of Python. Suspect you're looking at an
installation problem, or are trying to print the thing (& the docs warn
against trying to print self-referential objects -- you do get into an
infinite loop then).
personally-already-like-what-python-does-with-this-ly y'rs - tim
Tim Peters Kendall Square Research Corp