列表求平均值

def simple_average(numbers):
    if not numbers:
        return 0
    return sum(numbers) / len(numbers)

# 示例
numbers = [1, 2, 3, 4, 5]
print("简单平均值:", simple_average(numbers))  # 输出: 3.0

def weighted_average(values, weights):
    if len(values) != len(weights):
        raise ValueError("值和权重的长度必须相同")
    total_weight = sum(weights)
    if total_weight == 0:
        return 0
    weighted_sum = sum(v * w for v, w in zip(values, weights))
    return weighted_sum / total_weight

# 示例
values = [1, 2, 3]
weights = [0.2, 0.3, 0.5]
print("加权平均值:", weighted_average(values, weights))  # 输出: 2.3

def safe_average(numbers):
    if not numbers:
        return 0
    return sum(numbers) / len(numbers)

def safe_average(numbers):
    if not all(isinstance(x, (int, float)) for x in numbers):
        raise ValueError("列表中包含非数值类型的元素")
    if not numbers:
        return 0
    return sum(numbers) / len(numbers)

from decimal import Decimal

def precise_average(numbers):
    if not numbers:
        return 0
    total = sum(Decimal(str(x)) for x in numbers)
    return float(total / len(numbers))