How can I make silent exceptions louder in tkinter?

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There is report_callback_exception to do this:

import traceback
import tkMessageBox

# You would normally put that on the App class
def show_error(self, *args):
    err = traceback.format_exception(*args)
    tkMessageBox.showerror('Exception',err)
# but this works too
tk.Tk.report_callback_exception = show_error

If you didn’t import Tkinter as tk, then do

Tkinter.Tk.report_callback_exception = show_error

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