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UPC-A to UPC-E converter in Python
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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 | |
Test for all numbers 0-9 (last digit of upce) in number system 0 | |
Then test 1 number system 1 and one number system 2 | |
>>> upca_to_upce("042100005264") | |
'04252614' | |
>>> upca_to_upce("020200004417") | |
'02044127' | |
>>> upca_to_upce("020600000019") | |
'02060139' | |
>>> upca_to_upce("040350000077") | |
'04035747' | |
>>> upca_to_upce("020201000050") | |
'02020150' | |
>>> upca_to_upce("020204000064") | |
'02020464' | |
>>> upca_to_upce("023456000073") | |
'02345673' | |
>>> upca_to_upce("020204000088") | |
'02020488' | |
>>> upca_to_upce("020201000098") | |
'02020198' | |
>>> upca_to_upce("043000000854") | |
'04308504' | |
>>> upca_to_upce("127200002013") | |
'12720123' | |
>>> upca_to_upce("212345678992") | |
""" | |
start_digit = upca[0] | |
check_digit = upca[11] | |
manufacturer_code = upca[1:6] | |
product_code = upca[6:11] | |
upce = None | |
if not start_digit in ['0', '1']: | |
return None | |
if manufacturer_code[-3:] in ["000", "100", "200"] and int(product_code) <= 999: | |
upce = manufacturer_code[:2] + product_code[-3:] + manufacturer_code[2] | |
elif manufacturer_code[-2:] == '00' and int(product_code) <= 99: | |
upce = manufacturer_code[:3] + product_code[-2:] + "3" | |
elif manufacturer_code[-1] == "0" and int(product_code) <= 9: | |
upce = manufacturer_code[:4] + product_code[-1] + "4" | |
elif manufacturer_code[-1] != "0" and int(product_code) in [5,6,7,8,9]: | |
upce = manufacturer_code + product_code[-1] | |
if upce is not None: | |
upce = start_digit + upce + check_digit | |
return upce |
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