Python：如何在循環中結束程序？

Question

我所做的Python程序是基於菜單的，需要用戶輸入來瀏覽程序。

我已經放置了一個while循環，以便使用戶回到開始菜單以執行任務，但其中一個選項是「按0退出」將只是重新啓動循環而不結束程序。下面是代碼：

terms = {"ALU":"Arithmetic Logic Unit", "CPU":"Central Processing Unit", "GPU":"Graphics Processing Unit"} 
while True: 
    print(
    """ 
    Computing Terminology 

    0 - Quit 
    1 - Look Up a Term 
    2 - Add a Term 
    3 - Redefine a Term 
    4 - Delete a Term 
    5 - Display All Terms 
    """ 
    ) 
    menu = input("Choice: ") 
    print() 
    while menu != "0": 
     if menu == "1": 
      print("\n") 
      term = input("Type in a term you wish to see: ") 
      if term in terms: 
       definition = terms[term] 
       print("\n") 
       print(term, "means", definition, "\n") 
       break 
      else: 
       print("This term does not exist.\n") 
       break 
     elif menu == "2": 
      term = input("What term would you like to add?: ") 
      if term not in terms: 
       print("\n") 
       definition = input("What's the definition?: ") 
       terms[term] = definition 
       print("\n") 
       print(term, "has been added.\n") 
       break 
      else: 
       print("\n") 
       print("Term already exists, try redefining it instead.\n") 
       break 
     elif menu == "3": 
      term = input("Which term do you want to redefine?: ") 
      if term in terms: 
       definition = input("What's the new definition?: ") 
       terms[term] = definition 
       print("\n") 
       print(term, "has been redefined.\n") 
       break 
      else: 
       print("\n") 
       print("That term doesn't exist, try adding it instead.\n") 
       break 
     elif menu == "4": 
      term = input("Which term would you like to delete?: ") 
      if term in terms: 
       del terms[term] 
       print("\n") 
       print("The term has been deleted.\n") 
       break 
      else: 
       print("\n") 
       print("This term doesn't exist.\n") 
       break 
     elif menu == "5": 
      print("\n") 
      print("Terms available are: ") 
      for term in terms: 
       print("\n", term, "\n") 
     else: 
      print("\n") 
      print("Sorry, but", menu, "is not a valid choice.\n") 
      break 

print("\n") 
input("Press any key to exit.") #if user enters 0 I want the program to end here. 

Answer 1

這是我經常做

def print_menu(): 
    print('What would you like to do: ') 
    print('1. Retrieve data') 
    print('2. Store Data') 
    print('3. Exit') 

while True: 
    print_menu() 
    choice = int(input('Enter a number: ')) 
    if choice == 1: 
     #blah 
    elif choice == 2: 
     #blah blah 
    elif choice == 3: 
     break 

Answer 2

將menu = input("Choice: ")內while循環。

Answer 3

也許我太快略讀你的代碼，但我沒有看到外while True循環的地步。但是，退出程序的好方法是使用sys.exit。