Created
November 11, 2013 18:34
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I miscopied the tracking number for my passport's return envelope, and forgot the last digit. Luckily the Royal Mail publishes how to calculate their checksums.
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| import itertools | |
| import operator | |
| def calculate_checksum(number): | |
| digits = [int(x) for x in number] | |
| return 11 - (sum(itertools.imap(operator.mul, digits, [8, 6, 4, 2, 3, 5, 9, 7])) % 11) |
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