update,

daniel_jo/ITP4459_assignment_2023/tests/test_combobox.py

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+import tkinter as tk
+from tkinter import ttk
+from tkinter.messagebox import showinfo
+from calendar import month_name
+
+root = tk.Tk()
+
+# config the root window
+root.geometry('300x200')
+root.resizable(False, False)
+root.title('Combobox Widget')
+
+# label
+label = ttk.Label(text="Please select a month:")
+label.pack(fill=tk.X, padx=5, pady=5)
+
+# create a combobox
+selected_month = tk.StringVar()
+month_cb = ttk.Combobox(root, textvariable=selected_month)
+
+# get first 3 letters of every month name
+month_cb['values'] = [month_name[m][0:3] for m in range(1, 13)]
+
+# prevent typing a value
+month_cb['state'] = 'readonly'
+
+# place the widget
+month_cb.pack(fill=tk.X, padx=5, pady=5)
+
+
+# bind the selected value changes
+def month_changed(event):
+    """ handle the month changed event """
+    showinfo(
+        title='Result',
+        message=f'You selected {selected_month.get()}!'
+    )
+
+month_cb.bind('<<ComboboxSelected>>', month_changed)
+
+root.mainloop()