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计算平均值是计算机编程中最基本的操作之一，Python 提供了多种方法来实现这个操作。下面我将介绍三种方法来计算平均值：
<>方法一：使用 for 循环
使用 for 循环遍历列表，累加所有元素的值，最后除以列表的长度即可得到平均值。
def mean(numbers): total = 0 for n in numbers: total += n return total / len(
numbers) numbers = [1, 2, 3, 4, 5] print(mean(numbers)) # 输出 3.0
<>方法二：使用 sum 函数
Python 的内置函数 sum 可以直接计算列表中所有元素的和，只需将结果除以列表长度即可得到平均值。
def mean(numbers): return sum(numbers) / len(numbers) numbers = [1, 2, 3, 4, 5]
print(mean(numbers)) # 输出 3.0
<>方法三：使用 numpy 库
NumPy 是一个科学计算的强大库，其中包含了很多数学运算函数，可以非常方便地计算平均值。
import numpy as np def mean(numbers): return np.mean(numbers) numbers = [1, 2,
3, 4, 5] print(mean(numbers)) # 输出 3.0
以上三种方法都可以实现计算平均值的操作，根据不同的需求选择不同的方法即可。
<>个人建议：
如果是学习的话，建议学会方法1，如果是平时写东西，还是方法2省事。方法3没有什么特殊需要，了解即可。
<>总结
学好 Python 不论是就业还是做副业赚钱都不错，但要学会 Python
还是要有一个学习规划。我收藏了很多技术干货，可以共享给喜欢我文章的朋友们，如果你肯花时间沉下心去学习，它们一定能帮到你，干货内容包括：
<>点击文末的名片可以抱走
