1 #CalStatisticsV1.py
 2 def getNum():                                               #获取用户不定长度的输入
 3     nums=[]
 4     test=input("请输入要存储的数据(回车退出)：")
 5     while test != "":
 6         nums.append(eval(test))
 7         test=input("请继续输入其他数据(结束回车退出)：")      
 8     
 9     return nums
10 
11 def mean(means_n):                                          #求平均值
12     s=0
13     mean_result=0
14     for i in means_n:
15         s=s+i
16     mean_result=s/len(means_n)
17     return mean_result
18 
19 def median(numbers):                                       #求中位数
20     tem_s=sorted(numbers)    #临时排序
21     size=len(numbers)                                     
22               
23     if size%2==0:
24         med=(tem_s[size//2-1]+tem_s[size//2])/2
25     else:
26         med=(tem_s[size//2])
27     print(tem_s)                #打印排序后的列表
28     return med
29 
30 def dev(numbers,mean):                                   #计算方差
31     sdev=0
32     for num in numbers:
33         sdev=sdev+pow(num-mean,2)
34     var=pow(sdev/len(numbers),0.5)
35     return var
36 
37 
38 n=getNum()
39 means=mean(n)
40 medians=median(n)
41 var=dev(n,means)
42 print("列表:{},平均值:{:.2f},中位数:{:.2f},方差：{}".format(n,means,medians,var))

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