python - 字符串索引超出范围错误Python for循环

Question

我的简单暴力密码程序到目前为止可以正常运行，但是无论何时运行，它始终会打印出最后一个，并且出现字符串索引超出范围的错误。一切正常，我得到了想要的输出，但是无论何时while循环关闭并且程序停止运行，我仍然会收到错误消息。

userpassword = raw_input("Enter a password: ")

k = 0
cyclenumb = 0
newpasswordlist=[]

lowercaselist=["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"]
uppercaselist=["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"]
numberslist=["1", "2", "3", "4", "5", "6", "7", "8", "9", "0"]
symbolslist=["~", "`", "!", "@", "#", "$", "%", "^", "&", "*", "(", ")", "-", "_", "=", "+", "{", "[", "]", "}", "|", "\ ", ";", ":", "'", '"', ",", "<", ".", ">", "/", "?", " "]  

while cyclenumb <= 10000:

    for x in userpassword[k]:
        for z in lowercaselist:
            if x in z:
                newpasswordlist.append(z)
                k +=1
                print newpasswordlist
            if x is not z:
                for x in userpassword[k]:
                    for z in uppercaselist:
                        if x in z:
                            newpasswordlist.append(z)
                            k +=1
                            print newpasswordlist
                        if x is not z:
                            for x in userpassword[k]:
                                for z in numberslist:
                                    if x in z:
                                        newpasswordlist.append(z)
                                        k +=1
                                        print newpasswordlist
                                if x is not z:
                                    for x in userpassword[k]:
                                        for z in symbolslist:
                                            if x in z:
                                                newpasswordlist.append(z)
                                                k +=1
                                                print newpasswordlist

    if userpassword == newpasswordlist:
        break

print newpasswordlist
print "Here is your original password " + userpassword

请帮助我解决这个简单的错误。

Answer 1

此代码中没有任何东西甚至试图检测k大于或等于userpassword的长度。例如，您可以在k增加时进行检查；如果太大，请退出while循环。