How do I make python go back in code?

So basically, I am trying to create a game. Its going good so far! However, I am trying to figure out how to make code go back. I am a beginner at python, so I think its something to do with def start(): and start():, or something along those lines, but I'm not sure. If you do not know what I am talking about, I am basically saying I want something like:

    (1) if (variable) == (whatever)
    (2)     print ("Cool you win")
    (4) (code to go back and repeat line 1)
    (5) else:
    (6)     print ("You loose!")
    (7) (code to go back and repeat line 1)

so basically like a loop. So, how can I do this?

---

You want to use a while loop

while <condition>:
(1) if (variable == whatever):
(2)     print ("Cool you win")
(4) #nothing needed here
(5) else:
(6)     print ("You loose!")
(7) #nothing needed here

If you don't have a particular condition, you can just loop forever with while True:

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