Michael Torrie wrote:
A credit card number is indeed a number, and there are mathematical formulas for determining if a particular number is a valid (as in well-formed) credit card number,
If you're talking about the check-digit algorithm, that doesn't treat the whole number as an integer, it works on the individual digits: http://www.datagenetics.com/blog/july42013/
and possibly to identify what kind of card it is.
That's determined by the leading digits, and can be done just as well by treating them as characters. -- Greg -- https://mail.python.org/mailman/listinfo/python-list
