tkinter using two keys at the same time

Question

So tkinker can only use one key at a time. I am unable to say move to the left and up at the same time with this example. How would i go about doing it if I wanted to?

import tkinter
root = tkinter.Tk()
root.title('test')
c= tkinter.Canvas(root, height=300, width=400)
c.pack()
body = c.create_oval(100, 150, 300, 250, fill='green')

def key(event):
    OnKeyDown(event.char)
    print(event.char)

def MoveLeft(evenr)
    c.move(body, -10, 0)

def MoveRight(event):
    c.move(body, 10, 0)

def MoveUp(event):
    c.move(body, 0, 10)

def MoveDown(event):
    c.move(body, 0, -10)

root.bind('<KeyPress-Left>', MoveLeft)
root.bind('<KeyPress-Right>', MoveRight)
root.bind('<KeyPress-Up>', MoveUp)
root.bind('<KeyPress-Down>', MoveDown)

Personally I would also prefer to not have to "bind" my keys to functions as well as I also would like to use the keys to preform other actions (ie: make it move faster if I hold shift and up at the same time) Can tinker recognize when you pre-assign two keys or hold two keys at the same time?

Answer 1

Like this :

from Tkinter import *

root = Tk()
var = StringVar()
a_label = Label(root,textvariable = var ).pack()

history = []
def keyup(e):
    print e.keycode
    if  e.keycode in history :
        history.pop(history.index(e.keycode))

        var.set(str(history))

def keydown(e):
    if not e.keycode in history :
        history.append(e.keycode)
        var.set(str(history))

frame = Frame(root, width=200, height=200)
frame.bind("<KeyPress>", keydown)
frame.bind("<KeyRelease>", keyup)
frame.pack()
frame.focus_set()
root.mainloop()

Don't forget toggle keys because got a little mix status.