On 17 Jun 2006 00:49:51 -0700, Mike Duffy <[EMAIL PROTECTED]> wrote: >I just recently realized that the comparison operator "is" actually >works for comparing numeric values. Now, I know that its intended use >is for testing object identity, but I have used it for a few other >things, such as type checking, and I was just wondering whether or not >it is considered bad practice in the Python Community to use it for >numerics as well. > >Example: > >a = range(5) >b = range(5) > >if len(a) is len(b): > print "They're the same size!" >else: > print "They're not the same size!" >
No, this is wrong. >>> a = range(100) >>> b = range(100) >>> len(a) is len(b) False Use "is" to determine if two variables refer to exactly the same object, never to determine if two objects are equal. Jean-Paul -- http://mail.python.org/mailman/listinfo/python-list
