Adding and removing items from a playlist

Let's write some code for a feature that allows us to add and remove items from a playlist. To be more specific, we will write the code for a function for the four buttons marked in the following screenshot:

The four buttons, from left to right, perform the following functions:

• The first button from the left adds individual audio files to a playlist
• The second button deletes all the selected items from the playlist
• The third button scans a directory for audio files and adds all the found audio files to the playlist
• The last button empties the playlist

Since adding these features requires us to interact with the Listbox widget of Tkinter, let's spend some time getting to know the Listbox widget:

We can create a Listbox widget like we'd create any other widget, as follows:

 play_list = tk.ListBox(parent, **configurable...