Terry J. Reedy added the comment: Python does not set TCL_LIBRARY. _tkinter finds tcl/tk installed with Python at its known location for the platform. tkinter and IDLE work fine for months. Then user installs another program. That other software (not user, and unbeknownst to the user) sets TCL_LIBRARY to something that _tkinter cannot use. I am guessing that _tkinter, seeing TCL_LIBRARY, tries to use alternate install, cannot, and gives up, instead of falling back to the python-tcl it was using for months.
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