Python 3绑定不工作

Question

不知何故，我的绑定只有两个（左右鼠标按钮）。在我以前的程序中，我已经做了很多绑定，但是我仍然不知道为什么这不起作用。有人能帮我吗？你知道吗

class Window:
    def __init__(self):
        self.win=Tk()
        self.can=Canvas(self.win, height=800, width=800, bg="grey90")
        self.can.grid(row=0, column=0)

class Player:
    def __init__(self, bind1, bind2):
        win.can.bind(bind1, self.moveleft)
        win.can.bind(bind2, self.moveright)
    def moveleft(event, self):
        print("left")
    def moveright(event, self):
        print("right")

class Manage:
    def __init__(self, numofplayers):
        self.numofplayers=numofplayers
        self.players=[]
        self.bindings1=["<Left>", "<Button-1>", "<a>", "<m>"]
        self.bindings2=["<Right>", "<Button-3>", "<s>", "<n>"]
        self.start()
    def start(self):
        for i in range(self.numofplayers):
            self.players.append(Player(self.bindings1[i], self.bindings2[i]))

Answer 1

焦点在Tk()窗口上，所以画布不会捕捉按键。要使画布捕捉按键，需要在画布上focus_set()。你知道吗

class Window(object):
    def __init__(self):
        self.wind=Tk()
        self.can=Canvas(self.wind, height=800, width=800, bg="grey90")
        self.can.grid(row=0, column=0)
        self.can.focus_set()

我放在那里只是为了证明。您应该根据您的代码选择适当的位置。你知道吗