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从集合中随机抽取元素（不放回）

 1 import math
 2 from numpy import *
 3 
 4 
 5 dataIndex=list(range(20))
 6 print(dataIndex)
 7 print('----------')
 8 for i in range(20):
 9     randIndex =random.choice(dataIndex)  # go to 0 because of the constant
10     print(randIndex)
11     del(dataIndex[dataIndex.index(randIndex)])
12     print(dataIndex)
13     print('----------')
14 print('\n')

运行结果

"C:\Program Files\Python36-32\python.exe" C:/PythonResearch/LogisticRegression/Test_logRegres.py
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19]
----------
15
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18, 19]
----------
8
[0, 1, 2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 14, 16, 17, 18, 19]
----------
14
[0, 1, 2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 16, 17, 18, 19]
----------
4
[0, 1, 2, 3, 5, 6, 7, 9, 10, 11, 12, 13, 16, 17, 18, 19]
----------
3
[0, 1, 2, 5, 6, 7, 9, 10, 11, 12, 13, 16, 17, 18, 19]
----------
10
[0, 1, 2, 5, 6, 7, 9, 11, 12, 13, 16, 17, 18, 19]
----------
6
[0, 1, 2, 5, 7, 9, 11, 12, 13, 16, 17, 18, 19]
----------
9
[0, 1, 2, 5, 7, 11, 12, 13, 16, 17, 18, 19]
----------
16
[0, 1, 2, 5, 7, 11, 12, 13, 17, 18, 19]
----------
19
[0, 1, 2, 5, 7, 11, 12, 13, 17, 18]
----------
7
[0, 1, 2, 5, 11, 12, 13, 17, 18]
----------
0
[1, 2, 5, 11, 12, 13, 17, 18]
----------
13
[1, 2, 5, 11, 12, 17, 18]
----------
2
[1, 5, 11, 12, 17, 18]
----------
1
[5, 11, 12, 17, 18]
----------
12
[5, 11, 17, 18]
----------
18
[5, 11, 17]
----------
5
[11, 17]
----------
17
[11]
----------
11
[]
----------



Process finished with exit code 0