python异常触发及自定义异常类解析

class Point:  def __init__(self, x, y):    self.x = x    self.y = y# Define a class to raise Line errorsclass LineError(Exception):  #继承自基类Exception  def __init__(self,ErrorInfo):    self.errorinfo=ErrorInfo  def __str__(self):    return self.errorinfoclass Line:  def __init__(self, point1, point2):    self.point1 = point1    self.point2 = point2    if point1.x==point2.x and point1.y==point2.y:      raise LineError("Cannot create line") line = Line(Point(1, 2), Point(1, 2))