self.varLoc= StringVar(master)
        self.varLoc.set("status")

        self.varColumn= StringVar(master)
        self.varColumn.set("")

        self.locationColumn= Label(master,text="Select a column as a location indicator", font=("Helvetica", 12))
        self.columnLabel= Label(master,text="Select a column to process", font=("Helvetica", 12))

        global locationOption
        global columnOption
        columnOption= OptionMenu (master, self.varColumn,"",*columnList)
        locationOption= OptionMenu (master, self.varLoc,"",*columnList)

        self.locationColumn.grid (row=5, column=1, pady=(20,0), sticky=W, padx=(5,0))
        locationOption.grid (row=5, column=3, pady=(20,0))

def browser (selft):
            filename = askopenfilename()
            #open_file(filename)
            t=threading.Thread (target=open_file, args=(filename, ))
            #t=thread.start_new_thread (open_file,(filename, )) # create a new thread to handle the process of opening the file.
            # we must then send the file name to the function that  reads it somehow.
            t.start()
            t.join() #I use join because if I didn't,next lines will execute before  open_file is completed, this will make columnList empty and the code will not execute.
            opt=columnOption.children ['menu']
            optLoc= locationOption.children ['menu']
            optLoc.entryconfig (0,label= columnList [0], command=selft.justamethod)
            opt.entryconfig (0, label= columnList [0], command=selft.justamethod)
            for i in range(1,len (columnList)):
                opt.add_command (label=columnList[i], command=selft.justamethod)
                optLoc.add_command (label=columnList[i], command=selft.justamethod)

    def justamethod (self):
        print("method is called")
        print(self.varLoc.get())

window= Tk () #main window.
starter= Interface (window)


window.mainloop() #keep the window open until the user decides to close it.