Python tkinter Listbox

The Listbox widget in tkinter is used to display a list of items. It allows the user to select one or more items from the list. The following code creates a Listbox widget and adds items to it:

import tkinter as tk

root = tk.Tk()

# Create a Listbox widget
listbox = tk.Listbox(root)

# Add items to the Listbox
listbox.insert(0, "Item 1")
listbox.insert(1, "Item 2")
listbox.insert(2, "Item 3")

# Pack the Listbox widget
listbox.pack()

root.mainloop()

In the above code, we first import the tkinter module and create a new instance of the Tk class. We then create a Listbox widget and add items to it using the `insert` method. Finally, we pack the Listbox widget using the `pack` method and start the main event loop using the `mainloop` method of the root window.

We can also bind a function to the Listbox widget to be executed when an item is selected. The following code demonstrates this:

import tkinter as tk

root = tk.Tk()

# Define a function to be called when an item is selected
def on_select(event):
    selected_item = event.widget.get(event.widget.curselection())
    print("Selected item:", selected_item)

# Create a Listbox widget
listbox = tk.Listbox(root)

# Add items to the Listbox
listbox.insert(0, "Item 1")
listbox.insert(1, "Item 2")
listbox.insert(2, "Item 3")

# Bind the on_select function to the Listbox widget
listbox.bind('<<ListboxSelect>>', on_select)

# Pack the Listbox widget
listbox.pack()

root.mainloop()

In the above code, we define a function `on_select` that is called when an item is selected. This function retrieves the selected item using the `curselection` method of the Listbox widget and prints it to the console. We then bind this function to the Listbox widget using the `bind` method and the `<<ListboxSelect>>` event. When an item is selected, the `on_select` function is called and the selected item is printed to the console.