Terry J. Reedy <tjre...@udel.edu> added the comment:

This is almost certainly a tcl/tk/tkinter on Catalina issue, not an IDLE issue. 
 Screenshots are missing headlight colors, and that should be impossible to 
cause from Python.  In standard python, try

>>> import tkinter as tk
>>> r = tk.Tk()

Should see small (about 2"x2") box.  If not, add
>>> r.mainloop()

And/or, try $ python3 -m turtledemo

----------
assignee: terry.reedy -> 
components: +Tkinter -IDLE

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39844>
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