[Tkinter] Lambda seems to call expression 1 extra time every time it's called.

[DreamingInsanity]

Seeing as what you describe is not what I suggested you do, it's not really a counter argument to what I suggested you do. And if you GUI hangs up without the loops and the yields, there's something else going on.

Ok, fine, I will try out what you said.
Also, my GUI only hangs if I am using while loops with

time.sleep(x)

(it hangs until the loop is over)
To stop it hangning, I use this script (modified to work with PyQt5) and use yields instead of 'time.sleep()'.

D