【Python】统计

x = 0　　#循环变量
ls = []　　#创建列表
while x == 0:　
    shuru = input()
    if shuru == '':
        x = 1　　#中断while
    else:
        ls.append(eval(shuru))　　#增加元素
he = 0　　#和
fangchahe = 0　　#方差
zhongweishu = 0　　#中位数
zhongweils = []　　#排序后的列表
geshu = len(ls)　　#元素个数
for i in ls:
    he += i
pingjun = he / geshu
for j in ls:
    fangchahe += pow(2,j-pingjun)　　#方差 = （（各个元素与平均值的减）的平方）/元素个数
fangcha = fangchahe / geshu
zhongweils = sorted(ls)　　#sorted函数可以排序
midgeshu = len(zhongweils)
if midgeshu % 2 == 1:
    zhongweishu = zhongweils[midgeshu//2]
else:
    zhongweishu = (zhongweils[midgeshu//2]+zhongweils[midgeshu//2 - 1])//2
print(geshu,pingjun,'{0:.3}'.format(fangcha),zhongweishu)
print(zhongweils)