python列表平均值函数

def average(lst):
    return sum(lst) / len(lst) if lst else 0

# 示例使用
numbers = [10, 20, 30, 40, 50]
print("平均值是:", average(numbers))

def average(lst):
    if not lst:
        return 0
    num_list = [i for i in lst if isinstance(i, (int, float))]
    return sum(num_list) / len(num_list) if num_list else 0

def average(lst):
    if not lst:
        return 0
    num_list = [i for i in lst if isinstance(i, (int, float))]
    return sum(num_list) / len(num_list) if num_list else 0

# 测试用例
print(average([1, 2, 3, 4, 5]))  # 输出: 3.0
print(average([]))               # 输出: 0
print(average([1, 'a', 3]))      # 输出: 2.0