how to get arrow key input in python

1import tkinter as tk
2
3def key(event):
4    """shows key or tk code for the key"""
5    if event.keysym == 'Escape':
6        root.destroy()
7    if event.char == event.keysym:
8        # normal number and letter characters
9        print( 'Normal Key %r' % event.char )
10    elif len(event.char) == 1:
11        # charcters like []/.,><#$ also Return and ctrl/key
12        print( 'Punctuation Key %r (%r)' % (event.keysym, event.char) )
13    else:
14        # f1 to f12, shift keys, caps lock, Home, End, Delete ...
15        print( 'Special Key %r' % event.keysym )
16
17
18root = tk.Tk()
19print( "Press a key (Escape key to exit):" )
20root.bind_all('<Key>', key)
21# don't show the tk window
22root.withdraw()
23root.mainloop()