如何在Tkinter中进行多个键

Question

I'm trying to make multiple keys to press but the command focus_set() makes only one button available to press, the rest of the keys doesnt work. The button works if you click it but I want to use the button through the keyboard so how do I make so every key works

btnUp = tkinter.Button(master=None, text="Up", command=up)
btnUp.bind("w", up)
btnUp.focus_set()
btnUp.pack(side=tkinter.TOP, anchor=tkinter.W)

btnRight = tkinter.Button(master=None, text="Right", command=right)
btnRight.bind("d", right)
btnRight.focus_set()
btnRight.pack(side=tkinter.TOP, anchor=tkinter.W)

btnLeft = tkinter.Button(master=None, text="Left", command=left)
btnLeft.bind("a", left)
btnLeft.focus_set()
btnLeft.pack(side=tkinter.TOP, anchor=tkinter.W)

btnDown = tkinter.Button(master=None, text="Down", command=down)
btnDown.bind("s", down)
btnDown.focus_set()
btnDown.pack(side=tkinter.BOTTOM, anchor=tkinter.W)

Answer 1

You have to bind to the widget that the Buttons are in. For the most effectiveness, bind to root.

btnUp = tkinter.Button(master=None, text="Up", command=up)
root.bind("w", up)
btnUp.pack(side=tkinter.TOP, anchor=tkinter.W)

If you don't have access to root in that scope you can add this to the top:

root = tkinter._default_root

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Remember that the Button command callback and the bind callback have different signatures, so you need to define the functions with an optional event argument like this:

def up(event=None):
    # code