tkinter button command argument showing error: unknown option “-command”

Question

This code of mine is showing an error: _tkinter.TclError: unknown option "-command". I am a newbie so I may have made a silly mistake. Please help!

import tkinter
bod = tkinter.Tk()
button = tkinter.Button(bod, text="Hello (Click here)")
def hello():
    button = tkinter.Button(bod, text="Hello World!")
button.place(x=10, y=100, height="100", width="100", command=hello)
bod.mainloop()

Answer 1

You should do this :

from tkinter import *
def hello():
    button.config(text="Hello, World!")
bod = Tk()
button = Button(bod, text="Hello (Click here)", command=hello, height="100", width="100")  
button.pack()
bod.mainloop()

This will help you : http://effbot.org/tkinterbook/button.htm#Tkinter.Button.config-method