题解 | 两直线交点

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: 在这里输入你的代码，求直线 line_A 与 line_B 的交点
    x1,x2 = line_A.point_A.x,line_A.point_B.x
    y1,y2 = line_A.point_A.y,line_A.point_B.y
    x3,x4 = line_B.point_A.x,line_B.point_B.x
    y3,y4 = line_B.point_A.y,line_B.point_B.y
    den = (x1-x2) * (y3-y4) - (y1-y2) * (x3-x4)
    if abs(den) < 1e-12:          # 平行或重合
        return Point(-1, -1)

    x = ((x1*y2 - y1*x2) * (x3-x4) - (x1-x2) * (x3*y4 - y3*x4)) / den
    y = ((x1*y2 - y1*x2) * (y3-y4) - (y1-y2) * (x3*y4 - y3*x4)) / den
    return Point(x,y)


def main():
    data = list(map(float, input().split()))
    data.extend(list(map(float, input().split())))
    A = Point(data[0], data[1])
    B = Point(data[2], data[3])
    C = Point(data[4], data[5])
    D = Point(data[6], data[7])
    AB = Line(A, B)
    CD = Line(C, D)
    ans = find_meeting_point(AB, CD)
    print(f"{ans.x} {ans.y}")


if __name__ == "__main__":
    main()

犯错误：刚开始错写成 line_A.point_a，实际应该是line_A.point_A，用self.point_A，而不是输入的