Question

我的程序不断循环，我想弄清楚为什么在我进一步进入项目之前它自己。程序的目的是从字母表中创建用于解码/编码消息的密钥。

import random 
    def main():
        userselection = "0"
        print("This program allows you to create keys, econde plaintext, and decode ciphertext.")
        while userselection != "4":
            print("What would you like to do?")

        userselection = input("1.create a key 2.encode a message 3.decode a message 4.quit > ")
        if userselection == "1":
        #selection 1 stuffs goes here
            alphabet = "abcdefghijklmnopqrstuvwxyz"
            key = ""
            letter = random.choice(alphabet)

        elif userselection == "2":
        #selection 2 stuffs 
            plaintext = plaintext.lower()
            ciphertext = ""
            for i in range(len(plaintext)):
                alphabetposition = alphabet.find(plaintext[i])

            if alphabetposition >= 0:
                ciphertext = ciphertext + key[alphabetposition]
            else:
                ciphertext = cipertext + plaintext[i]

        elif userselection == "3":
        #selection 3 stuffs
            print()

        elif userselection != "4":
            print("invalid selection")






    if __name__ == "__main__":
        main()

Answer 1

我认为您需要在while循环中接受用户输入。试试这个： -

import random 
    def main():
        userselection = "0"
        print("This program allows you to create keys, econde plaintext, and decode ciphertext.")
        while userselection != "4":
            print("What would you like to do?")
            userselection = input("1.create a key 2.encode a message 3.decode a message 4.quit > ")
        if userselection == "1":
        #selection 1 stuffs goes here
            alphabet = "abcdefghijklmnopqrstuvwxyz"
            key = ""
            letter = random.choice(alphabet)

        elif userselection == "2":
        #selection 2 stuffs 
            plaintext = plaintext.lower()
            ciphertext = ""
            for i in range(len(plaintext)):
                alphabetposition = alphabet.find(plaintext[i])

            if alphabetposition >= 0:
                ciphertext = ciphertext + key[alphabetposition]
            else:
                ciphertext = cipertext + plaintext[i]

        elif userselection == "3":
        #selection 3 stuffs
            print()

        elif userselection != "4":
            print("invalid selection")

    if __name__ == "__main__":
        main()

Answer 2

循环处于错误位置。它在你设置userselection =＆＃34; 0＆＃34;时循环之后，在用户输入之前检查用户选择！=＆＃34; 4＆＃34;：打印（＆＃34;你想做什么？＆＃34;）

我建议您注意这一行并重新运行。

我的程序不断循环，我无法弄清楚原因

2 个答案: