1 #coding:utf-8
2
3 import random
4 import time
5 """
6 注意盘符小写
7
8 """
9 f = open("d:\\MyData\\zhaohz4\\Desktop\\train.txt","r") #源文件
10 fw = open("d:\\MyData\\zhaohz4\\Desktop\\sample_10.txt","w") #待写文件
11 """
12 如下亦可
13 f = open("d:/MyData/zhaohz4/Desktop/train.txt","r")
14 fw = open("d:/MyData/zhaohz4/Desktop/sample_10.txt","w")
15 """
16 def test():
17 start = time.clock()
18 raw_list = f.readlines()
19 random.shuffle(raw_list)
20 for i in range(50): #随机抽取数目 n
21 fw.writelines(raw_list[i])
22
23 end = time.clock()
24 print("cost time is %f" %(end - start))
25
26 if __name__ =="__main__":
27 test()
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