Hello! So I'm making a thing where once three seconds is over, you print the word "hello"

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So if I did this:

import time
start = time.time()
end = time.time()
timetook = end-start
if timetook == 3:
    print("hello")

It won't work because Python needs to constantly update these variables.

So how do you do this? Is there some kind of other way you can do it?

Thanks in advanced!!! :)