The biggest use I have for decimal numbers that begin with 0 is in credit card numbers, account numbers and the like where the first check you do is 'does this thing have the correct number of digits'. So far, all the examples I've been able to find in my code -- which does this sort of stuff a lot -- is looking at string versions of decimal numbers, but I suspect there is old code out there in the wild which just used integers.
Laura -- https://mail.python.org/mailman/listinfo/python-list
