Created
May 18, 2023 03:06
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Validate and format ISSNs
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| # Validate and format ISSNs | |
| def validISSN(issn): | |
| issn = issn.upper().replace('X', 'A').replace('-', '') | |
| return len(issn) == 8 and sum((8 - i) * int(n, 16) for i, n in enumerate(issn)) % 11 == 0 | |
| def formatISSN(issn): | |
| issn = issn.upper().replace('-', '') | |
| return f'{issn[:4]}-{issn[4:]}' |
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