def quadratic(a, b, c):    if not isinstance(a or b or c, (int, float)):        raise TypeError("输入的数据类型不正确，请输入整数或小数")    if a == 0:        if b != 0:            print("x1 = x2 = -%s/%s" % (c, b))        else:            return "方程无解"    else:        if b ** 2 - 4 * a * c < 0:            print("方程无实根")        else:            x1 = (-b + math.sqrt(b ** 2 - 4 * a * c)) / (2 * a)            x2 = (-b - math.sqrt(b ** 2 - 4 * a * c)) / (2 * a)            return x1, x2print('quadratic(2, 3, 1) =', quadratic(2, 3, 1))print('quadratic(1, 3, -4) =', quadratic(1, 3, -4))if quadratic(2, 3, 1) != (-0.5, -1.0):    print('测试失败')elif quadratic(1, 3, -4) != (1.0, -4.0):    print('测试失败')else:    print('测试成功')