Luhn Algorithm: Credit Card Checker
Use Luhn algorithm to validate credit card numbers. Every credit card number is given as a string and has a correct form of four four-digit blocks, separated by single whitespace.
For this particular purpose, the algorithm includes such steps:
Double every second digits starting from the rightmost.
If the result of doubling is greater than 9, add the digits of the number.
Sum all digits.
Check if the sum is clearly divisible by 10.
Input: String (str).
Output: Boolean value (bool).
Examples:
assert checker("4137 8947 1175 5904") == True
assert checker("5468 1234 5678 9123") == False
assert checker("4539 1488 0343 6467") == True
CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.
In order to install CheckiO client you'll need installed Python (version at least 3.8)
Install CheckiO Client first:
pip3 install checkio_client
Configure your tool
checkio --domain=py config --key=
Sync solutions into your local folder
checkio sync
(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)
checkio serv -d
Alternatevly, you can install Chrome extension or FF addon
checkio install-plugin
checkio install-plugin --ff
checkio install-plugin --chromium
Read more here about other functionality that the checkio client provides. Feel free to submit an issue in case of any difficulties.
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