python基本统计数据

#获取用户不定长度的输入
def getNum():
 nums = []
 iNumStr = input("请输入数字（回车退出）：")
 while iNumStr != "":
 nums.append(eval(iNumStr))
 iNumStr = input("请输入数字（回车退出）：")
 return nums
#计算平均值
def mean(numbers):
 s = 0.0
 for num in numbers:
 s += num
 return s/len(numbers)
#计算方差
def dev(numbers,mean):
 sdev = 0.0
 for num in numbers:
 sdev += (num - mean)**2
 return pow(sdev/(len(numbers)-1),0.5)
#计算中位数
def median(numbers):
 sorted(numbers)
 size = len(numbers)
 if size % 2 == 0:
 med = (numbers[size//2-1] + numbers[size//2])/2
 else:
 med = numbers[size//2]
 return med
n = getNum()
m = mean(n)
print("平均值：{},方差：{:.2},中位数：{}.".format(m,dev(n,m),median(n)))

作者：zhangshs

原文：https://my.oschina.net/zhangshsURL/blog/3008906