python mod10 checker

mod10.py

def mod10(number):
	digits = []
	even = False
	for digit in reversed(number):
		digit = ord(digit) - ord('0')
		if even:
			digit = digit * 2
			if digit >= 10:
				digit = digit % 10 + digit / 10
		digits.append(digit)
		even = not even
	return sum(digits) % 10 == 0

if __name__ == '__main__':
	# valid
	print mod10('370000000000002')
	print mod10('6011000000000012')
	print mod10('4007000000027')
	print mod10('4012888818888')
	print mod10('3088000000000017')
	print mod10('38000000000006')
	# invalid
	print mod10('3700000000000002')
	print mod10('6011001000000012')
	print mod10('4006000000027')
	print mod10('4012886818888')
	print mod10('3088020000000017')
	print mod10('38000000030006')

I think you could change digit = digit % 10 + digit / 10 to digit = digit % 10 + 1