pyimage1 doesn't exist error

Problem Summary:

• When AutoComplete.autocomplete() is executed in main.py, the PostgreSQL connection displays a success message, but the actual data retrieval (User.get_random_meme()) does not work, or the GUI raises an error (pyimage1 doesn't exist).
• The same code works normally when run independently.
• Text does not display properly in the message box, or the message box itself does not appear.

🔎 Cause Analysis

1. The pyimage1 doesn’t exist error is a representative error that occurs when a Tkinter image object is created but destroyed in the middle of mainloop, preventing Tkinter from referencing it.

   • This occurs when an image set on a PhotoImage or Label is created as a local variable and disappears without a reference being retained.
   • When displaying an image in a GUI, it must be maintained as an instance variable, such as self.image = tk.PhotoImage(...).

2. Why PostgreSQL appears not to be working

   • The connection was actually established and the log was printed, but the DB operation may not be completed if mainloop() terminates incorrectly before the GUI window appears.
   • In particular, if mainloop() terminates prematurely due to an exception occurring inside the GUI or an incorrect flow, the subsequent code may not execute.

🛠 Solution

✅ 2. Potential conflict caused by creating tk.Tk() again in AutoComplete instead of using the MainThreadExecutor root

MainThreadExecutor is already running the main event loop with self.root.mainloop(). However, calling tk.Tk() again in AutoComplete.display_meme_gui() causes abnormal behavior due to creating duplicate Tk roots.

Solution: In AutoComplete, do not create a new Tk(); create a Toplevel() instead.

self.root = tk.Toplevel()

✅ Consolidated Checklist

• Change tk.Tk() → tk.Toplevel() (to prevent duplicate roots)

🔚 Conclusion

The code structure is fundamentally correct, but Tkinter image management, creating duplicate Tk() roots, and the implicit termination timing of the DB connection are causing the problems.

Fixing these three issues should allow autocomplete() and the DB query to work normally in main.py as well. If you want, I can also show you sample code for the MemeSelectionGUI side.

Realization

As expected, when it comes to finding out, one should not be picky about the means and methods. ChatGPT accomplished what Perplexity could not. And to find out, I would have known if I had searched for the pyimage2 error.