#Option Menu demonstration

from tkinter import *

class OptionMenuDemo:
    def __init__(self, aWindow):
       #A list of string options for the optionMenu
       OPTIONS = ["CS 1301", "CS 2316", "CS 4400"]
       self.sv = StringVar()

       #Set CS4400 to be the default
       self.sv.set(OPTIONS[2] )
       
       #The asterisk (star) in front of OPTIONS unpacks
       #the list into individual arguments.
       om = OptionMenu( aWindow, self.sv, *OPTIONS, command=self.optionChanged)
       om.pack()

       self.entry = Entry(aWindow,textvariable=self.sv)
       self.entry.pack()

    def optionChanged(self, theString):
        print("The option changed!")
        print("self.sv value is:", self.sv.get() )
        print("Passed String is:", theString)

mainWin = Tk()
app = OptionMenuDemo(mainWin)
mainWin.mainloop()