Why doesn't the output show up on the Tkinter textbox?

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There could be several reasons why the output is not showing up on the Tkinter textbox. Here are some possible reasons and solutions:

1. The output is not being properly formatted or written to the textbox. Make sure you are using the correct syntax to write the output to the textbox. You can use the insert() method to insert text at a specific index in the textbox.

2. The textbox is not being updated after the output is written. You can use the update_idletasks() method to update the textbox after inserting text.

3. The textbox is not being properly configured or placed in the GUI. Make sure you have properly configured the text attribute of the textbox to display the text and that it is placed in the appropriate location in the GUI.

4. There could be an error in the code that is preventing the output from being written to the textbox. Check for any error messages and debug the code as necessary.