python - 如何循环这个密码程序

Question

我有这段代码，但我不确定如何使其循环，以便在完成编码或解码后它会恢复菜单。现在运行良好，只是不知道如何循环它。

import string

key = "qetuoadgjlxvnw ryipsfhkzcbm"
abc = "abcdefghijklmnopqrstuvwxyz "
abc_key = string.maketrans(abc, key)
key_abc = string.maketrans(key, abc)

def encode():
    """Encodes input text"""
    text = raw_input ("Please enter text to be encoded: ")
    text_lower = string.lower(text)
    text_lower;
    print text_lower.translate(abc_key);

def decode():
    """decyphers code"""
    code = raw_input ("Please enter code to be decyphered: ")
    code_lower = string.lower(code)
    code_lower;
    print code_lower.translate(key_abc);


# Welcome message
print "Welcome to Jake's Cryptography program!"

# Print menu
print "SECRET DECODER MENU"
print "0) Quit"
print "1) Encode"
print "2) Decode"

option = raw_input ("What do you want to do?")

if option == "0":
    print "Thank you for during secret spy stuff with me!"
elif option == "1":
    encode()
elif option == "2":
    decode()
else:
    print "Sorry, that is not an option."

感谢任何帮助!

Answer 1

将其包裹在 while 中陈述。像这样的事情:

# Welcome message
print "Welcome to Jake's Cryptography program!"

# Print menu
while True:
    print "SECRET DECODER MENU"
    print "0) Quit"
    print "1) Encode"
    print "2) Decode"

    option = raw_input ("What do you want to do?")

    if option == "0":
        print "Thank you for during secret spy stuff with me!"
        break
    elif option == "1":
        encode()
    elif option == "2":
        decode()
    else:
        print "Sorry, that is not an option."

注意break语句!

以上每次都会打印菜单。如果您只想打印提示，请将 while True: 行向下移动到菜单后面(但在 raw_input 行之前)，然后修复缩进。