You can add rows to a treeview without specifying the columns.
This will make the treeview widget look like a regular listbox widget.
# This will make it not show the column header bar at the top.
treeview_cars.configure(show="tree")
More code:
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treeview_cars=ttk.Treeview(self)# Don't show the columns (makes it look like a list box)treeview_cars.configure(show="tree")# Add a rowtreeview_cars.insert(parent="",index=tk.END,text="Mini Van")treeview_cars.pack()