Python轻松玩转列表之求最大值/最小值/平均值与总和的实用指南

shopping_list = ['苹果', '香蕉', '橙子', '葡萄']

steps = [12000, 15000, 9000, 18000, 11000, 13000, 16000]

max_steps = max(steps)
print(f"一周中步数最多的一天走了{max_steps}步")

def find_max(lst):
    if not lst:  # 检查列表是否为空
        return None
    max_val = lst[0]  # 假设第一个元素是最大的
    for num in lst[1:]:  # 从第二个元素开始遍历
        if num > max_val:
            max_val = num
    return max_val

max_steps_manual = find_max(steps)
print(f"手动实现：一周中步数最多的一天走了{max_steps_manual}步")

min_steps = min(steps)
print(f"一周中步数最少的一天走了{min_steps}步")

def find_min(lst):
    if not lst:
        return None
    min_val = lst[0]
    for num in lst[1:]:
        if num < min_val:
            min_val = num
    return min_val

min_steps_manual = find_min(steps)
print(f"手动实现：一周中步数最少的一天走了{min_steps_manual}步")

total_steps = sum(steps)
print(f"一周总共走了{total_steps}步")

def calculate_sum(lst):
    total = 0
    for num in lst:
        total += num
    return total

total_steps_manual = calculate_sum(steps)
print(f"手动实现：一周总共走了{total_steps_manual}步")

average_steps = sum(steps) / len(steps)
print(f"平均每天走了{average_steps:.2f}步")  # .2f表示保留两位小数

def calculate_average(lst):
    if not lst:  # 避免除以0的错误
        return 0
    total = calculate_sum(lst)  # 可以复用之前写的calculate_sum函数
    return total / len(lst)

average_steps_manual = calculate_average(steps)
print(f"手动实现：平均每天走了{average_steps_manual:.2f}步")

def list_stats(lst):
    if not lst:
        return None, None, None, None
    max_val = find_max(lst)  # 复用之前写的find_max函数
    min_val = find_min(lst)  # 复用之前写的find_min函数
    total = calculate_sum(lst)  # 复用之前写的calculate_sum函数
    average = total / len(lst)
    return max_val, min_val, total, average

max_s, min_s, total_s, avg_s = list_stats(steps)
print(f"最大值: {max_s}, 最小值: {min_s}, 总和: {total_s}, 平均值: {avg_s:.2f}")

def list_stats_simple(lst):
    if not lst:
        return None, None, None, None
    max_val = max(lst)
    min_val = min(lst)
    total = sum(lst)
    average = total / len(lst)
    return max_val, min_val, total, average

max_s_simple, min_s_simple, total_s_simple, avg_s_simple = list_stats_simple(steps)
print(f"简洁版 - 最大值: {max_s_simple}, 最小值: {min_s_simple}, 总和: {total_s_simple}, 平均值: {avg_s_simple:.2f}")

scores = [85, 92, 78, 90, 88, 76, 95, 89]

max_score, min_score, total_score, avg_score = list_stats_simple(scores)

print("\n学生成绩分析:")
print(f"最高分: {max_score}")
print(f"最低分: {min_score}")
print(f"全班总分: {total_score}")
print(f"平均分: {avg_score:.2f}")