问Python在每次另一个函数结束时转到输入函数

EN

import json


user_input = input("**^**: ").lower()

#d
if (user_input == "learn"):
    backslash = "\\"
    phrase = input("What phrase do you want me to reply to: ")
    answer = input("What do you want me to answer: ")

    #Checks for illegal signs
    if backslash in phrase and backslash in answer:
        print ("Contains illegal signs")
    else:
        print("I leant something new")
        data = {}
        data[phrase] = []
        data[phrase].append({
            'phrase': phrase,
            'answer': answer
        })
        with open('data.txt', 'w') as outfile:
            json.dump(data, outfile)