使用python程序诊断问题（基于关键字密码加密和解密字符串）

这是一个课堂作业，我必须创建一个程序，该程序能够使用关键字对消息进行加密和解密，该关键字将被重复和修剪，以匹配原始消息的长度。程序使用ASCII字符集，并相应地对值进行加减

我曾经尝试过这段代码，有两种变体，它们非常接近于工作状态，并且有一些问题我无法诊断，我将下面的代码包括在内以供参考，我想知道是否有人能够提出建议，以使程序更高效，并帮助我诊断问题

变更1：

    def encrypt(message, keyWrd):
    characters = "abcdefghijklmnopqrstuvwxyz"
    enc = ""
    for x in message:
        if x in characters:
            for y in keyWrd:
                crShift = ord(y)
            num = ord(x)
            num += crShift
            if num > ord("z"):
                num -= 26
            elif num < ord("a"):
                num += 26
            enc = enc+chr(num)
        else:
            enc = enc + x
    return enc

def encrypt(message, keyWrd):
    characters = "abcdefghijklmnopqrstuvwxyz"
    enc = ""
    for x in message:
        if x in characters:
            for y in keyWrd:
                crShift = -ord(y)
            num = ord(x)
            num += crShift
            if num > ord("z"):
                num -= 26
            elif num < ord("a"):
                num += 26
            enc = enc+chr(num)
        else:
            enc = enc + x
    return enc

def functHand(passThr, message, keyWrd):
        message = message.lower()
        if passThr == 1:
                return encrypt(message, keyWrd)
        elif passThr == 2:
                return decrypt(message, keyWrd)

def error(errMSG):
        if errMSG == 1:
            print("---------------------\nInvalid Data entry")
            start()

def keyPlaster(msg, keyWrd):
    keyword = ''
    while len(keyWrd) < len(msg):
        keyword += keyWrd
    keyword = keyword[:len(msg)]
    return keyword


def start():
    print("---------------------")
    try: 
        option = int(input("What would you like to do?:\n1)Encrypt\n2)Decrypt\n3)Exit\n>> "))
    except ValueError:
            error(1)
    if option == 1:
        msg = input("What message would you like to encrypt?: ").replace(' ', '').lower()
        keyWrd = input("What is the keyword?: ").replace(' ', '').lower()
        keyword = ''
        while len(keyWrd) < len(msg):
            keyword += keyWrd
        keyword = keyword[:len(msg)]
        enc = functHand(1, msg, keyword)
        print("The encrypted message is: ", enc)
        start()
    elif option == 2:
        msg = input("What message would you like to decrypt?: ").replace(' ', '').lower()
        keyWrd = input("What is the keyword?: ").replace(' ', '').lower()
        keyword = ''
        while len(keyWrd) < len(msg):
            keyword += keyWrd
        keyword = keyword[:len(msg)]
        msg = functHand(2, msg, keyword)
        print("The decrypted message is: ", msg) 
        start()
    elif option == 3: 
        print("---------------------\nEXITING\n---------------------")
        raise SystemExit
    else:
        error(1)

start()

变式2：

def menu():
    try:
        option = int(input("Please select an option:\n1)Encrypt\n2)Decrypt\n3)Exit\n>> "))
    except ValueError:
        print("-----ERROR-----")
        ################
        raise SystemExit
    while option >= 1 and option <= 3:
        if option == 1:
            menuOpt = 1
            handler(menuOpt)
        elif option == 2:
            menuOpt = 2
            handler(menuOpt)
        elif option == 3:
            menuOpt = 3
            handler(menuOpt)
    else:
         print("-----ERROR-----")
         ################
         raise SystemExit

def handler(menuOpt):
    if menuOpt == 1 or menuOpt == 2:
        origInput = input("Please enter a string: ").replace(' ', '').lower()
        manipInput = input("Please enter a keyword: ").replace(' ', '').lower()
        keyPlaster(manipInput, origInput)
        if menuOpt == 1:
            enc(menuOpt, origInput, keyword)
            print("The encrypted message is: ", enc)
        elif menuOpt == 2:
            dec(menuOpt, origInput, keyword)
            print("The decrypted message is: ", dec)
        elif menuOpt == 3:
            print("-----EXITING-----")
            raise SystemExit

def keyPlaster(manipInput, origInput):
    global keyword
    keyword = ''
    while len(keyword) < len(origInput):
        keyword += manipInput
    keyword = keyword[:len(origInput)]
    return keyword



def enc(menuOpt, origInput, keyword):
    characters = "abcdefghijklmnopqrstuvwxyz"
    enc = ""
    for x in origInput:
        if x in characters:
            for y in keyword:
                crShift = ord(y)
            num = ord(x)
            num += crShift
            if num > ord("z"):
                num -= 26
            elif num < ord("a"):
                num += 26
            enc = enc+ chr(num)
        else:
            enc = enc + x
    return enc

def dec(menuOpt, origInput, keyword):
    characters = "abcdefghijklmnopqrstuvwxyz"
    dec = ""
    for x in origInput:
        if x in characters:
            for y in keyword:
                crShift = -ord(y)
            num = ord(x)
            num += crShift
            if num > ord("z"):
                num -= 26
            elif num < ord("a"):
                num += 26
            dec = dec+ chr(num)
        else:
            dec = dec + x
    return dec

menu()

---

提前感谢。

您的预期产量是多少？您的实际输出是什么？@retarity这方面的一个示例输入是“Computingisfun”和“GCSE”的关键字，这应该给出一个“JRFUBWSNLLKBQ”的输出。<这是用于加密函数的，解密应该以JRFUBWSNLLKBQ作为消息，GCSE作为关键字的相反方式工作。但我遇到的问题是，程序似乎无法正确输出，并且我很难对其进行诊断，因此非常感谢您的帮助：另请参见：