Python tkinter：AttributeError：'class'对象没有属性'event'

Question

代码如下：

from tkinter import *

class Main:
    def __init__(self):
        self.root = Tk()
        self.canvas = Canvas(self.root, width="600", height="400")
        self.canvas.pack()

        self.r1 = self.canvas.create_polygon(20, 0, 20, 20, 40, 10, fill='red')
        self.loop()

    def keypress(self, event):
        x, y = 0, 0
        if self.event.char == "a":
            x = -4
        if self.event.char == "d":
            x = 4
        if self.event.char == "w":
            y = -4
        if self.event.char == "s":
            y = 4
        self.canvas.move(self.r1, x, y)

    def loop(self):
        self.root.bind_all("<Key>", self.keypress)
        self.root.mainloop()

main = Main()

此代码输出AttributeError: 'Main' object has no attribute 'event'

我尝试添加self.event = Event，但会显示错误AttributeError: type object 'Event' has no attribute 'char'

如果需要，请询问更多信息。

附言。抱歉英语不好，我是初学者，所以请不要评判。

Answer 1

改变你的方法：

    def keypress(self, event):
        x, y = 0, 0
        if event.char == "a":
            x = -4
        if event.char == "d":
            x = 4
        if event.char == "w":
            y = -4
        if event.char == "s":
            y = 4
        self.canvas.move(self.r1, x, y)

你试过self.event。你只需要event