求大神写一段程序。谢谢。

substr函数

一般情况

1. #!/usr/bin/python2
   
2. 
   
3. def Filter(a):
   
4.     Mean = sum(a) / float(len(a))
   
5.     Vari = map(lambda x: (Mean - x) ** 2, a)
   
6.     Stdd = (sum(Vari) / float(len(Vari))) ** 0.5
   
7.     x, z = Mean - 3 * Stdd, Mean + 3 * Stdd
   
8.     b = filter(lambda y: x < y < z, a)
   
9.     return a if a == b else Filter(b)
   
10. 
    
11. # A = map(int, open('data.txt'))
    
12. A = [11, 23, 6, 4, 12, 7, 9, 3, 5, 10, 25, 32, 77, 5, 3, 112]
    
13. B = Filter(A)
    
14. 
    
15. print A
    
16. print B

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