def great_function(a):
    return a + 100

def great_function2(a):
    import tkinter as tk

    window=tk.Tk()
    window.title('my window')
    window.geometry('200x100')

    var=tk.StringVar()
    l=tk.Label(window,bg='yellow',width=20)
    l.pack()

    def print_selection():
        l.config(text='you have selected'+var.get())
    r1=tk.Radiobutton(window,text='Option A',
                    variable=var,value='A',command=print_selection)
    r1.pack()
    r2=tk.Radiobutton(window,text='Option B',
                    variable=var,value='B',command=print_selection)
    r2.pack()
    r3=tk.Radiobutton(window,text='Option C',
                    variable=var,value='C',command=print_selection)
    r3.pack()
    window.mainloop()
    return a+1