How to run a action 1 time ONLY in while loop

I want to run 1 time ONLY in while loop.

while True:
    print("Hello World")#this word always print
    print("HI")#this word print 1 time only

>Solution :

Just add a validation logic to it

x = false
while True:
    print("Hello World")
    if x == false:
        print("HI")
        x = true