A python class I wrote to add or validate a GTIN check digit.
Python, 67 lines
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Copy to clipboard1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | #!/usr/bin/env python
class GTIN(object):
def __init__(self, barcode=''):
self.barcode = barcode
def __checkDigit(self, digits):
total = sum(digits) + sum(map(lambda d: d*2, digits[-1::-2]))
return (10 - (total % 10)) % 10
def validateCheckDigit(self, barcode=''):
barcode = (barcode if barcode else self.barcode)
if len(barcode) in (8,12,13,14) and barcode.isdigit():
digits = map(int, barcode)
checkDigit = self.__checkDigit( digits[0:-1] )
return checkDigit == digits[-1]
return False
def addCheckDigit(self, barcode=''):
barcode = (barcode if barcode else self.barcode)
if len(barcode) in (7,11,12,13) and barcode.isdigit():
digits = map(int, barcode)
return barcode + str(self.__checkDigit(digits))
return ''
if __name__ == '__main__':
# validateCheckDigit()
gtin = GTIN()
if gtin.validateCheckDigit('1'*11 +'7') == True:
print 'Pass'
else:
print 'Fail'
gtin = GTIN()
if gtin.validateCheckDigit('1'*11 +'7') == True:
print 'Pass'
else:
print 'Fail'
if GTIN('1'*11 +'7').validateCheckDigit() == True:
print 'Pass'
else:
print 'Fail'
if GTIN().validateCheckDigit('1'*11 +'6') == False:
print 'Pass'
else:
print 'Fail'
# addCheckDigit()
gtin = GTIN()
if GTIN().addCheckDigit('1' *11) == '1'*11 +'7':
print 'Pass'
else:
print 'Fail'
gtin = GTIN('1'*7)
if gtin.addCheckDigit() == '1'*7 +'5':
print 'Pass'
else:
print 'Fail'
if GTIN('1'*12).addCheckDigit() == '1'*12 +'6':
print 'Pass'
else:
print 'Fail'
if GTIN().addCheckDigit('1'*11) == '1'*11 + '7':
print 'Pass'
else:
print 'Fail'
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