数据统计值的计算+PYTHON

#基本统计值得计算
#CalStatisticsV1.py
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

def mean(numbers):
    s=0.0
    for i in numbers:
        s=s+i
    return s/len(numbers)

def dev(numbers,mean):#计算方差
    sdev = 0.0
    for i in numbers:
        sdev = sdev+(i-mean)**2
    return pow(sdev/len(numbers)-1,0.5)

#sorted 可以直接给列表排序
def median(numbers):#计算中位数
    sorted(numbers)
    size=len(numbers)
    if size%2==0:
        med=(numbers[size//2-1]+numbers[size//20])/2
    else:
        med=numbers[size//2]
    return med

n=getnum()
m=mean(n)
print("平均值{},方差：{:.2}.".format(m,dev(n,m)))

#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
def getnums():
    n=[]
    n1=input()
    while n1!="":
        n.append(eval(n1))
        n1=input()
    return n

m=getnums()
print(sorted(m),end=" ")
print("这组数据的中位数是%d\n"%median(m))
print("这组数据的中位数是{}".format(median(m)))

'''
numbers=[9,2,3]
for i in range (len(numbers) - 1):
    for j in range (len(numbers) - i - 1):
        if (numbers[j] > numbers[j + 1]):
            numbers[j + 1], numbers[j] = numbers[j], numbers[j + 1]
for k in range (len(numbers)):
    print("%d\n"%numbers[k])
n=[6,5,9,8,5,3]
print(sorted(n))

'''