Stephen Paul Chappell added the comment: It seems that most functions and methods do not bother checking if _default_root exists before trying to access it. However, upon seeing line 366 in ttk (if tkinter._support_default_root:), my recommendation would be to change line 319 to "if tkinter._support_default_root and tkinter._default_root:" to fix the problem. Several similar lines appear in tkinter\__init__.py at locations 1835, 1845, and 2050.
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