有没有办法在不使用break的情况下结束程序？

Question

I got a program when input a number they show some command and when i put in number 4 i want it print goodbye and end the program. I know there is a way is use break but my teacher dont want to use it . Is there any other way to end it when enter number 4 ? Thank in advance : PS : i just new leaner to Python.

while True  :
     num= int(input("enter : "))

    if num == 1:
       print("encrypt text")
    elif num == 2 :
        print("decrypt text")
    elif num == 3 :
        print("Brute force decrypt")
    elif num ==4 :
        print("goodbye")
    else :
            print('false')

Answer 1

1. Use a variable in the while condition:

num = 0
while num != 4:
    num = int(input("enter : "))    
    ... your other code

2. Raise an exception:

try:
    while True:
        num = int(input("enter : "))    
        ... your other code
        elif num == 4:
            raise StopIteration 
        ...
except StopIteration as e:
     print('goodbye')

3. Put it inside a function and return:

def main():
    while True:
        num = int(input("enter : "))    
        ... your other code
        elif num == 4:
            return
        ...
main()
print('goodbye')

4. Exit the program:

while True:
    num = int(input("enter : "))
    ... your other code
    elif num ==4 :
        print("goodbye")
    
        # Do any of the following
        exit()
        quit()
        raise SystemExit
        sys.exit() # requires "import sys"
    ...

Answer 2

A simple way could be:

number = 0
while number != 4:
    ...

Answer 3

To exit:

import sys
sys.exit(0)

If you need to break nested loops, you can put your code inside a function and then use "return None" instead of "break"

Answer 4

Well, I am also new to the platform of python but I have the answer to your question. You can use:

import sys          
sys.exit(0)    

Well, I hope that this might help you. ☺