python: run the second condition after the first one becomes false

We can leverage decorators¹ here to enforce the invariant.

def fill_if_empty(func):
    def wrapper(*args, **kwargs):
        if YOUR_CONDITION_TO_CHECK_FOR_EMPTY_DIR:
            """
            fill empty directory here.
            """
            process_user_input()

        func(*args, **kwargs)
    return wrapper

@fill_if_empty
def do_process_on_the_full_directory():
    """
    Run some process on directory
    """
    pass

do_process_on_full_directory() 

_{1. Checkout this post to know more about decorators: How to make function decorators and chain them together?}