用计数循环实现，每隔10行写到新文件中

# coding:utf-8        
with open('dist_1.txt','r',encoding= 'utf-8') as f1,open('dist_2.txt','w',encoding= 'utf-8') as f2:
    i=0
    for line in f1:
        i+=1
        if i%10==0:
            f2.write(line)