How do i return to the previous question in Python Script

Question

i'm new on using Python Script, i've been using Jupyter Notebook and finally realized the differences between the two of them. In this code i'm trying to create a simple command using def, where i need to type the number 1 - 3.

def Twitter():
    while True:
        user_input = input(
            'Pick one: 1) Crawling | 2) Verification | 3) Return ---->')

        if user_input == '1':
            print('You picked Crawling')
            break
        elif user_input == '2':
            print('You picked Verification')
            break
        elif user_input == '3':
            print('Return')
            Opening()
            break
        else:
            print('Type a number 1-3')
            continue

user_input = ''

def Opening():
    while True:
        user_input = input(
            'Pick one: 1) Twitter | 2) Instagram ---->')
    
        if user_input == '1':
            Twitter()
            break
        elif user_input == '2':
            print('Instagram!')
            break
        else:
            print('Type a number 1-2')
            continue

I'm still very immature and I need help on when I picked the number 3, the function would return to the previous part instead of not outputing the result at all thanks!

What do you mean the return to the previous part? You can call the function itself from within itself, would that do? So if the user choose 3 just call the same function again — SiP, Dec 19 '22 at 08:30

コリン · Accepted Answer · 2022-12-25T11:13:15.447

3

Instead of using a break statement, you can return the function inside a function.

See: https://www.geeksforgeeks.org/returning-a-function-from-a-function-python/

def Twitter():
    while True:
        user_input = input(
            'Pick one: 1) Crawling | 2) Verification | 3) Return ---->')

        if user_input == '1':
            print('You picked Crawling')
            break
        elif user_input == '2':
            print('You picked Verification')
            break
        elif user_input == '3':
            print('Return')
            return Opening()  # switch to Opening()
        else:
            print('Type a number 1-3')
            continue


def Opening():
    while True:
        user_input = input(
            'Pick one: 1) Twitter | 2) Instagram ---->')

        if user_input == '1':
            return Twitter()  # switch to Twitter()
        elif user_input == '2':
            print('Instagram!')
            break
        else:
            print('Type a number 1-2')
            continue


if __name__ == '__main__':
    Opening()

edited Dec 25 '22 at 11:13

answered Dec 19 '22 at 08:33

コリン

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To return to the previous part i need to add that statement to make it work? If for example i want the question to branch `if __name__ == '__main__':` I just need to add that to the code? – TheBotHunter Dec 19 '22 at 08:40
You actaully don't need ```if __name__ == '__main__':``` statement. Simply calling the function ```Opening()``` will work fine. Feel free to ignore it or remove it. – コリン Dec 19 '22 at 08:45
It's just a good practice to have it when importing this module to another Python file. It ensures that anything within this statement will only execute when running the current Python file. – コリン Dec 19 '22 at 08:48
Hmm, i'm not sure that i understand it, correct me if i'm wrong. `if __name__ == '__main__':` so this command is used when you're trying to run this code in another python file? – TheBotHunter Dec 19 '22 at 08:58
When running file 1, file 1 has this statement ```__name__ == '__main__'``` to be true, so function ```Opening()``` will be excuted; however, if you import file 1 to file 2, ```__name__ == '__main__'``` (which is inside file 1) will become false in the context of file 2. Function ```Opening()``` will not be executed. Let's say you don't have this statement in file 1. Then when file 1 is imported to file 2, the function ```Opening()``` will be executed immediately, and you probably don't want this to happen... – コリン Dec 19 '22 at 09:05
Ahhh i think i'm starting to understand what you meant, so that line is used to make sure that the code in file 2 wouldn't run immediately? but what i don't understand is how it would immediately run if i don't add that line on file 2. – TheBotHunter Dec 19 '22 at 09:12
Here is a much better answer: https://stackoverflow.com/questions/419163/what-does-if-name-main-do – コリン Dec 19 '22 at 09:14

score 0 · Answer 2 · answered Dec 19 '22 at 08:37

it works fine for me... maybe you can try to call the function recursively instead of using while true?

def Twitter():
    user_input = input(
        'Pick one: 1) Crawling | 2) Verification | 3) Return ---->')

    if user_input == '1':
        print('You picked Crawling')
        Twitter()
    elif user_input == '2':
        print('You picked Verification')
        Twitter()
    elif user_input == '3':
        print('Return')
        Opening()
    else:
        print('Type a number 1-3')
        Twitter()

user_input = ''

def Opening():
    user_input = input(
        'Pick one: 1) Twitter | 2) Instagram ---->')

    if user_input == '1':
        Twitter()
    elif user_input == '2':
        print('Instagram!')
        Opening()
    else:
        print('Type a number 1-2')
        Opening()

Twitter()

How do i return to the previous question in Python Script

2 Answers2