直接上代码，python版本。
参考: https://en.wikipedia.org/wiki/Vehicle_identification_number
def check_sum(vincode):
"""
checkout length, word and checksum
"""
maps = "0123456789X"
weights = [
8, 7, 6, 5, 4, 3, 2, 10, 0, 9, 8, 7, 6, 5, 4, 3, 2
]
table = {
"0": 0, "1": 1, "2": 2, "3": 3, "4": 4, "5": 5, "6": 6, "7": 7, "8": 8, "9": 9,
"A": 1, "B": 2, "C": 3, "D": 4, "E": 5, "F": 6, "G": 7, "H": 8,
"J": 1, "K": 2, "L": 3, "M": 4, "N": 5, "P": 7, "R": 9,
"S": 2, "T": 3, "U": 4, "V": 5, "W": 6, "X": 7, "Y": 8, "Z": 9,
}
if not isinstance(vincode, str) and not isinstance(vincode, unicode):
return False
if len(vincode) != 17:
return False
vincode = vincode.upper()
if "I" in vincode or "O" in vincode or "Q" in vincode:
return False
total = 0
for index, value in enumerate(vincode):
try:
products = table[value] * weights[index]
except KeyError:
break
total = total + products
index = total%11
return maps[index] == vincode[8]
