I find this programming pattern to be useful... but can it cause problems? Python 3.3.2+ (default, Feb 28 2014, 00:52:16) [GCC 4.8.1] on linux Type "help", "copyright", "credits" or "license" for more information. >>> a = [1,2,3] >>> b = [4,5,6] >>> c = (a,b) >>> c ([1, 2, 3], [4, 5, 6]) >>> c[0][0] = 0 >>> c ([0, 2, 3], [4, 5, 6])
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