如何返回或打印两个属性之间的数学函数的属性？Python

def calculate_function_properties(x1, y1, x2, y2):
    # 计算斜率
    slope = (y2 - y1) / (x2 - x1)
    
    # 计算截距
    intercept = y1 - slope * x1
    
    # 计算函数表达式
    if intercept >= 0:
        function_expression = f'y = {slope}x + {intercept}'
    else:
        function_expression = f'y = {slope}x - {-intercept}'
    
    # 打印属性
    print("斜率:", slope)
    print("截距:", intercept)
    print("函数表达式:", function_expression)
    
    # 返回属性
    return slope, intercept, function_expression

# 示例调用
x1 = 1
y1 = 2
x2 = 3
y2 = 4
slope, intercept, function_expression = calculate_function_properties(x1, y1, x2, y2)