The code below is a basic square drawing using Turtle in python. Running the code the first time works. But running the code again activates a Turtle window that is non-responsive and subsequently crashes every time. The error message includes raise Terminator and Terminator Restarting kernel in Spyder (Python 3.6 on a Dell Desktop) fixes the problem in that I can then run the code again successfully, but the root cause is a mystery? Link to another question that is similar but as yet unanswered. Please +1 this question if you find it worthy of an answer!! import turtle bob = turtle.Turtle() print(bob) for i in range(4): bob.fd(100) bob.lt(90) turtle.mainloop() Continue reading...