Tkinter is a module for pyhton to create graphic user interfaces (GUI). It is a built in module, so it's free and you do not need to install it, because it is just there.
To avoid losing the selection of an item in a tkinter listbox when you select something outside of the listbox, you can use exportselction=False as argument when you call an istance of the class tkinter.Listbox
def listbox():
"The book chapter name list goes here"
self._lbx = tk.Listbox(
self._frame,
bg="yellow",
exportselection=False # To mantain the selection in the listbox when you select in the text box
# selectmode=tk.MULTIPLE
)
self._lbx.grid(
column=0,
row=0,
sticky="nswe"
) # adapt the listbox to the frame
# self._lbx.configure(selectmode="")
''' this is how you avoid losing selection in tkinter listbox '''
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