[Coffee is love]

Hello so yeah i'm partially retarded and i'm trying to make my own Point of Sale program via python and I want to make it semi visually appealing before i get into any gritty backend stuff but i've never put any images or colors into anything lul so I want to make the background an image and buttons have a gradient; I'm using tkinter and no matter what i throw in my code it won't work or load!
Spoiler (Click to View)

Code

from tkinter import *

def donothing():
   x = 0

root = Tk()
root.attributes('-fullscreen', True)
root.bind("<Escape>", lambda e: e.widget.quit())
root.title("POS")

def callback():
    print ("CASH IS FOR SEXY PEOPLE")
def credit():
    print ("credit")
root.geometry("700x400")
c = Button(root, text="CASH", command=callback)
b = Button(root, text="CREDIT", command=credit)
b.pack()
c.pack()
root.mainloop()

[HFDone]

http://stackoverflow.com/questions/13637...-in-python