X.set(event.x) Y.set(event.y)elifwhat.get() == 2:#绘制直线,先删除刚刚画过的直线,再画一条新的线try:#移动一个点删除一个点canvas.delete(lastDraw)exceptException as e:passlastDraw= canvas.create_line(X.get(),Y.get(),event.x,event.y,fill=