$ python2 Python 2.7.8 (default, Oct 20 2014, 15:05:19) [GCC 4.9.1] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> a = 256 >>> b = 256 >>> a is b True >>> a = 257 >>> b = 257 >>> a is b False >>>
It's not safe to use 'is' to compare integers. Use == -- https://mail.python.org/mailman/listinfo/python-list
