Decoders · difficulty 2 of 3
IBAN validator 🏦
Validate a bank IBAN with the mod-97 rule: move the first four characters to the end, turn letters into numbers (A=10 … Z=35), and check the whole thing leaves remainder 1.
Write it in the browser and press run. Real Python, checked against the expected output, no account needed.
Skills: strings, maths, dicts