Why is my tkinter GUI freezing when I use `join()` on a thread?

Freezing/Hanging tkinter GUI in waiting for the thread to complete

In this code, the GUI is freezing when a button is pressed. The issue stems from the use of join() on a thread, which blocks the mainloop() of the GUI until the thread completes its execution.

Reasons for the hanging GUI

Tkinter is a single-threaded GUI library, meaning that all GUI operations must be performed on the main thread. When a thread is started using join(), it blocks the main thread from executing any more code until the thread finishes. This can lead to the GUI becoming unresponsive or even hanging entirely.

Proposed solution

To avoid the freezing issue, the code should be modified to use a non-blocking method for executing the thread. One way to do this is to use the after() method of the tkinter widget to schedule a function to be executed after a specified delay.

<code class="python">m = magic()

def hello_callback():
    m.add_item("asd")
    m.start_converting("test")

# Schedule the function to be executed after 50 milliseconds
top.after(50, hello_callback)</code>

In this code, the hello_callback function is scheduled to be executed after 50 milliseconds. This allows the GUI to continue responding to user input while the thread is executing in the background.

Conclusion

By using a non-blocking method for executing the thread, the GUI remains responsive and the freezing issue is resolved.

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