样本抽样

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 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 import random
 sample_ra = 0.04
 random_scope = int(1/sample_ra)
 rand = random.randint(1,int(4/sample_ra)) 
 if rand > (2*random_scope + 4) or rand < (2*random_scope):
    continue