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| def add_check_digit(upc_str): | |
| """ | |
| Returns a 12 digit upc-a string from an 11-digit upc-a string by adding | |
| a check digit | |
| >>> add_check_digit('02345600007') | |
| '023456000073' | |
| >>> add_check_digit('21234567899') | |
| '212345678992' | |
| >>> add_check_digit('04210000526') |
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| def upca_to_upce(upca): | |
| """ | |
| Takes a upc-a code (12 digits), including check digit, | |
| as a string and returns upc-e representation. | |
| UPC-E representation will be eight digits, including check digit | |
| Returns None if no upc-e representation is possible | |
| Rules from http://mdn.morovia.com/kb/UPCE-Specification-10634.html | |