Way to quit the most outer function from an inner function?

Question

Let's say I have code that looks like this:

def lab():
    letter = prompt() 
    def experiment_1():
        if letter == 1:
            print("check")
            #Would there be a way to quit the lab function right here?
    def experiment_2():
        if letter == 1:
            print("check2")

    experiment_1()
    experiment_2()
lab()

Would there be a way for me to quit the lab function right after I print "check"? I tried putting return at the end of experiment_1 but that just seems to go right to the next function which is experiment_2.

Answer 1

The most obvious way is to raise an exception. It will allow you to get out from any depth. Define a custom exception and catch it at some outer level. For example:

class MyError(Exception):
    pass

def _lab():
    letter = prompt() 

    def experiment_1():
        if letter == 1:
            print("check")
            raise MyError

    def experiment_2():
        if letter == 1:
            print("check2")

    experiment_1()
    experiment_2()

def lab():
    try:
        return _lab()
    except MyError:
        return

lab()

This particular example is kind of ugly, but you should get the idea.