It simply swaps some things around to make things more confusing, then goes into an infinite loop (whether or not you import or execute it standalone). it’s no different than just including in the global scope:

while True:
    pass

I was kinda lazy with the fuckery, tbh. I could have gotten much more confusing, but don’t have too much time today. :-)

I always use

if "__main__" == main:
    __main__()

…and earlier in the code:

def __main__():
    while True:
        pass
main = "__main__"

This helps to prevent people from arbitrarily running my code as a library or executable when I don’t went them to.