ООП, множественное наследование, property: запнулся, не знаю как дальше делать

class Point:
_x = None
_y = None
 
@property # getter
def x(self):
return self._x
 
@x.setter
def x(self, value):
if not isinstance(value, int):
raise TypeError
self._x = value
 
@property # getter
def y(self):
return self._y
 
@y.setter
def y(self, value):
if not isinstance(value, int):
raise TypeError
self._y = value
 
def __init__(self, x_coord, y_coord):
self.x = x_coord
self.y = y_coord
 
 
point1 = Point(0, 3)
point1.x = 100
point2 = Point(4, 0)
 
 
class Line:
 
begin = None
end = None
 
def __init__(self, begin_point: Point, end_point: Point):
self.begin = begin_point
self.end = end_point
 
@ property
def length(self):
print('in length_getter')
return ((self.begin.x - self.end.x) ** 2 + (self.begin.y - self.end.y) ** 2) ** 0.5
 
 
line1 = Line(point2, point1)
 
print(line1.length)