Python tkinter make exceptions fatal

safe_tk.py

from contextlib import contextmanager
import tkinter as tk  # https://stackoverflow.com/questions/66734619/no-module-named-tkinter#66735147
import tkinter.messagebox

# Two different approaches to handling mainloop errors in tkinter.
# 1. A context manager that will display errors in callbacks and initializers (RECOMMENDED)
# 2. A subclass of Tk that will only display errors in callbacks, not initializers


@contextmanager
def tk_fail_mainloop(root):
    "Usage: with tk_fail_mainloop(tk.Tk()) as root: ..."
    def report_callback_exception(self, exc_type, exc_value, traceback):
        try:
            self.__class__.report_callback_exception(self, exc_type, exc_value, traceback)
            # Don't bother showing traceback in the error box
            # because that'll be a lot of work *and* break native warning messages
            # https://stackoverflow.com/posts/comments/137714401
            tk.messagebox.showerror(message=f'{exc_type.__name__}: {exc_value}', master=self)
        finally:
            self.destroy()
    root.report_callback_exception = report_callback_exception.__get__(root, root.__class__)

    try:
        yield root
    except Exception as exc:
        root.report_callback_exception(exc.__class__, exc, exc.__traceback__)


class _Tk(tk.Tk):
    "Alternative to tk.Tk that handles **uncaught** errors appropriately"
    def report_callback_exception(self, exc_type=RuntimeError, exc_value=None, traceback=None):
        try:
            super().report_callback_exception(exc_type, exc_value, traceback)
            # Don't bother showing traceback in the error box
            # because that'll be a lot of work *and* break native warning messages
            # https://stackoverflow.com/posts/comments/137714401
            tk.messagebox.showerror(exc_type.__name__, exc_value, master=self)
        finally:
            self.destroy()