class Point: def __init__(self, x=0.0, y=0.0): self.x = x self.y = y class Line: def __init__(self, point_a=None, point_b=None): self.point_A = point_a if point_a is not None else Point() self.point_B = point_b if point_b is not None else Point() def find_meeting_point(line_A, line_B): # TODO: 在这里输入...