在 python 中找到列表的平均值
先决条件: sum()函数、 len()函数、 round()函数、T6】reduce()、T8】lambda、和 mean() 。
给定一个数字列表，任务是找出该列表的平均值。平均值是元素的总和除以元素的数量。
示例:
Input : [4, 5, 1, 2, 9, 7, 10, 8]
Output : Average of the list = 5.75
Explanation:
Sum of the elements is 4+5+1+2+9+7+10+8 = 46
and total number of elements is 8.
So average is 46 / 8 = 5.75
Input : [15, 9, 55, 41, 35, 20, 62, 49]
Output : Average of the list = 35.75
Explanation:
Sum of the elements is 15+9+55+41+35+20+62+49 = 286
and total number of elements is 8.
So average is 46 / 8 = 35.75
Using sum()
在 Python 中，我们只需使用 sum() 和 len() 函数就可以找到列表的平均值。
- sum () : We can get the sum of the list by using the sum () function.
- len () : The len () function is used to obtain the length or number of elements in the list.
# Python program to get average of a list
def Average(lst):
return sum(lst) / len(lst)
# Driver Code
lst = [15, 9, 55, 41, 35, 20, 62, 49]
average = Average(lst)
# Printing average of the list
print("Average of the list =", round(average, 2))
输出:
Average of the list = 35.75
使用 reduce()和 lambda
我们可以使用 reduce()来减少循环，并通过使用 lambda 函数来计算列表的总和。如上所述，我们使用 len()来计算长度。
# Python program to get average of a list
# Using reduce() and lambda
# importing reduce()
from functools import reduce
def Average(lst):
return reduce(lambda a, b: a + b, lst) / len(lst)
# Driver Code
lst = [15, 9, 55, 41, 35, 20, 62, 49]
average = Average(lst)
# Printing average of the list
print("Average of the list =", round(average, 2))
输出:
Average of the list = 35.75
使用平均值()
内置函数 mean()可用于计算列表的平均值。
# Python program to get average of a list
# Using mean()
# importing mean()
from statistics import mean
def Average(lst):
return mean(lst)
# Driver Code
lst = [15, 9, 55, 41, 35, 20, 62, 49]
average = Average(lst)
# Printing average of the list
print("Average of the list =", round(average, 2))
输出:
Average of the list = 35.75
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