from tkinter import * from tkinter import ttk win =Tk() win.title("Aimtocode Python") win.geometry('200x100') course=["Java","Python","C","C++","JavaScript","PHP","HTML","CSS"] l1=Label(win,text="Select Your Course @ Aimtocode") l1.grid(column=0, row=0) cb=ttk.Combobox(win,values=course,width=10) cb.grid(column=0, row=1) cb.current(0) win.mainloop()