Comment arrêter ce programme Python

Question

Lorsque j'exécute ceci dans IDLE et que je tape 0 pour la réponse, il imprime le message mais n'arrête pas le programme. Je pensais que le réglage de keepGoing sur False l'arrêterait mais je ne sais pas ce qui se passe. S'il vous plaît aider

""" crypto.py 
Implements a simple substitution cypher 
""" 

alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 
key = "XPMGTDHLYONZBWEARKJUFSCIQV" 

def main(): 
    keepGoing = True 
    while keepGoing: 
    response = menu() 
    if response == "1": 
     plain = input("text to be encoded: ") 
     print(encode(plain)) 
    elif response == "2": 
     coded = input("code to be decyphered: ") 
     print (decode(coded)) 
    elif response == "0": 
     print ("Thanks for doing secret spy stuff with me.") 
     keepGoing = False 
    else: 
     print ("I don't know what you want to do...") 
    return main() 

def menu(): 
    print("Secret decoder menu") 
    print("0) Quit") 
    print("1) Encode") 
    print("2) Decode") 
    print("What do you want to do?") 
    response = input() 
    return response 

def encode(plain): 
    plain = plain.upper() 
    new = "" 
    for i in range(len(plain)): 
     y = alpha.index(plain[i]) 
     new += key[y] 
    return new 

def decode(coded): 
    coded = coded.upper() 
    x = "" 
    for i in range(len(coded)): 
     z = key.index(coded[i]) 
     x += alpha[z] 
    return x 

main() 

Answer 1

Vous appelez principal() à nouveau, avant de quitter la boucle while, et le redémarrage du programme:

def main(): 
    keepGoing = True 
    while keepGoing: 
     response = menu() 
     if response == "1": 
      plain = input("text to be encoded: ") 
      print(encode(plain)) 
     elif response == "2": 
      coded = input("code to be decyphered: ") 
      print (decode(coded)) 
     elif response == "0": 
      print ("Thanks for doing secret spy stuff with me.") 
      keepGoing = False 
     else: 
      print ("I don't know what you want to do...") 
#  return main() # <-- delete this line 

Une meilleure conception, comme l'a suggéré @Barmar, est d'utiliser un while True boucle, et une déclaration break pour sortir après avoir atteint une certaine condition:

def main(): 
    while True: 
     response = menu() 
     if response == "1": 
      plain = input("text to be encoded: ") 
      print(encode(plain)) 
     elif response == "2": 
      coded = input("code to be decyphered: ") 
      print (decode(coded)) 
     elif response == "0": 
      print ("Thanks for doing secret spy stuff with me.") 
      break 
     else: 
      print ("I don't know what you want to do...")