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Validating credit card

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Please see what you may and may not do after receiving answers.

First of all, you should encapsulate your functionality in a function, unless you really want to use your code only once.

Rules for sequences to qualify as credit card numbers: Sequences must: -Contain exactly 16 digits; -Start with a 4,5 or 6; -Only consist of digits (0-9).

Sequences may: -Have digits in groups of 4, separated by one hyphen.

A valid credit card number - must contain exactly 16 digits, - must start with a 4, 5 or 6 - must only consist of digits (0-9) or hyphens '-', - may have digits in groups of 4, separated by one hyphen "-".

- must NOT use any other separator like ' ' , '_', - must NOT have 4 or more consecutive repeated digits.

This is now tricky, since it's not clear whether the hyphens are part of the run. ([0-9])$' def is_valid_card_number(sequence): """Returns `True' if the sequence is a valid credit card number.Next, you do the same thing with the digits skipped in the first step, but this time you double the value of each digit and add the value of each digit in the result.Finally, you add both totals together and if the result is evenly divisible by 10, then the card has passed validation.I recently had to write some code to process credit card orders and thought I'd share a bit of my code.Fortunately, credit card numbers are created in a way that allows for some basic verification.That way you will be able to check your code easier. If it's a single use script, you probably don't have a need for a function.