[Tutor] how can I exit a while loop in turtle graphics

[Ian D]

I am trying to exit a while loop whilst using turtle graphics.
I don't seem to have the logic correct at all.
I have tried a few different things

These might seem a bit illogical to you guys but to me they make some sense, 
sadly

I just don't really grasp these while loops and their usage.(obviously) 

I am trying to find a way to use a while loop with the turtle graphics

 
import turtle as t
import sys
def f():
sys.exit()
while True:
t.fd(1)
t.onkey(f, "Up")
t.listen()
==== another go ====
import turtle as t
import sys
def f():
 pass
while True:
t.fd(1)
 if t.onkey(f, "Up"):
sys.exit()
 t.listen()

==== another go ====

import turtle as t
import sys
def f():
    pass

alive = True

while alive:
    t.fd(1)
    if t.onkey(f, "Up"):
        alive = False
        
    t.listen()                                    
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