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Generate checksum for a barcode/ean-13
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| def calc_ean_13_checksum(ean): | |
| import math | |
| sum = 0 | |
| for x, c in enumerate(str(ean)[::-1]): | |
| if (x+1) % 2 == 0: | |
| sum += int(c) | |
| else: | |
| sum += int(c) * 3 | |
| return int(math.ceil(sum / 10.0) * 10) - sum |
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