python中事件处理的方法

#coding=utf-8

from tkinter import *

class application(Frame):

    def __init__(self,master):

        super().__init__(master)

        self.master=master

        self.pack()

        self.createWidget()

    def createWidget(self):

        self.canvas = Canvas(self,width=200,height=200,bg='green')

        self.canvas.pack()

        self.canvas.bind('<Button-1>',self.mouseTest)

        self.canvas.bind('<B1-Motion>',self.test_drag)

        self.canvas.bind('<KeyPress>',self.keyboard_test)

        self.canvas.bind('<KeyPress-a>',self.press_a_test)

        self.canvas.bind('KeyRelease-a',self.release_a_test)

    def mouseTest(self,event):

        print('鼠标左键单机位置（相对于父容器）:{0},{1}'.format(event.x,event.y))

        print('鼠标左键单击位置(相对于屏幕):{0},{1}'.format(event.x_root,event.y_root))

        print('事件绑定组件:{0}'.format(event.widget))

    def test_drag(self,event):

        self.canvas.create_oval(event.x,event.y,event.x+1,event.y+1)

    def keyboard_test(self,event):

        print('键的keycode:{0},char:{1},keysym:{2}'.format(event.keycode,event.char,event.keysym))

    def press_a_test(self,event):

        print('press a')

    def release_a_test(self):

        print('release a')

if __name__ == '__main__':

    root = Tk()

    root.geometry('500x300')

    app=application(root)

    root.mainloop()