Python168的学习笔记5

 1 import csv
 2 
 3 with open(‘pingan.csv‘,‘rb‘) as rf:
 4     reader = csv.reader(rf)#读操作
 5     with open(‘pingan2.csv‘,‘wb‘) as wf:
 6         writer = csv.writer(wf)
 7         headers = reader.next()
 8         writer.writerow(headers)#写操作
 9         for row in reader:
10             if row[0] < ‘2016-01-01‘:#满足条件就退出循环
11                 break　　　　　　　　　　　　
12             if int(row[5]) >= 50000000:#对特定数据的判断
13                 writer.writerow(row)

 1 import json
 2 
 3 l = (1,2,‘abc‘,{‘name‘:‘john‘,‘age‘:18})
 4 
 5 with open(‘demo.json‘,‘wb‘) as f:
 6     json.dump(l,f)
 7     
 8 with open(‘demo.json‘,‘rb‘) as f:
 9     r = json.load(f)