Python小工具备份

遇到一次需要将加拿大的邮编范围打印出来的需求，比如需要打印E0A到E1V之间所有的邮编，就写了下面的小工具，备个份

def getZipCodes(start,end):
    sl = list(start)
    startASC = ord(sl[0]) * 10000 + int(sl[1]) * 100 + ord(sl[2])
    el = list(end)
    endASC = ord(el[0]) * 10000 + int(el[1]) * 100 + ord(el[2])
    for firstOrd in range(ord(sl[0]), ord(el[0]) + 1):
        print(chr(firstOrd))
        firstOrdMatch = firstOrd * 10000
        for secondOrd in range(10):
            secondOrdMatch = secondOrd * 100
            for thirdOrd in range(ord('A'), ord('Z') + 1):
                if startASC <= firstOrdMatch + secondOrdMatch + thirdOrd <= endASC:
                    yield chr(firstOrd) + str(secondOrd) + chr(thirdOrd)


for s in getZipCodes("E0A", "E1V"):
    print(s)