On Tue, Dec 15, 2015 at 01:54:30AM +0000, Alan Gauld wrote: > This behaviour should never be relied on since the definition > of a "small int" is potentially implementation dependant and > could even change with Python version or platform. Always > use == to test integers.
It isn't just *potentially* implementation dependent, it certainly is implementation dependant. Different versions of Python have used different rules for which small ints are cached, and the rules for when they will be re-used or cached. For example, this is with Python 2.7: py> a = 100001 py> b = 100001 py> a is b False py> a = 100002; b = 100002 py> a is b True You CANNOT rely on this behaviour, it WILL change from version to version. -- Steve _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
