列表中元组的第二个元素的平均值

def calculate_average(lst):
    second_elements = [t[1] for t in lst]
    total = sum(second_elements)
    count = len(second_elements)
    average = total / count
    return average

# 示例用法
my_list = [(1, 10), (2, 20), (3, 30), (4, 40)]
result = calculate_average(my_list)
print("平均值：", result)