On Wed, 22 Jul 2015 20:11:47 -0600, Michael Torrie wrote: > On 07/22/2015 07:51 AM, Grant Edwards wrote: >> On 2015-07-22, Ben Finney <ben+pyt...@benfinney.id.au> wrote: >>> Laura Creighton <l...@openend.se> writes: >>> >>>> 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'. >>> >>> The following are examples of types from the real world that people >>> think of, and casually discuss, as “numbers”. >>> >>> * Postal code * Credit card number * Telephone number * Car >>> registration plate number * Personal Identification Number (PIN) >> >> Those are all strings. Not numbers. > > That depends. 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, and possibly to identify what > kind of card it is.
no it is a string,that happens to be made up out of digits. the digits can be manipulated but you do not perform maths on a credit card number as a whole -- Did I do an INCORRECT THING?? -- https://mail.python.org/mailman/listinfo/python-list
