import tkinter

key = ''

def key_down(e):
    global key
    key = e.keysym

def key_up(e):
    global key
    key = ""

cx = 400
cy = 300

def main_proc():
    global cx, cy
    if key == 'Up':
        cy = cy - 20
    if key == 'Down':
        cy = cy + 20
    if key == 'Left':
        cx = cx - 20
    if key == 'Right':
        cx = cx + 20
    canvas.coords('MYCHR', cx, cy)
    root.after(100, main_proc)

root = tkinter.Tk()
root.title('移動角色')
root.bind('<KeyPress>', key_down)
root.bind('<KeyRelease>', key_up)
canvas = tkinter.Canvas(width = 800, height = 600, bg = 'lightgreen')
canvas.pack()
img = tkinter.PhotoImage(file = 'images/mimi.png')
canvas.create_image(cx, cy, image = img, tag = 'MYCHR')
main_proc()
root.mainloop()