python json、shelve、pickle模块

json可以序列化多次但是反序列化只能反序列化一次，shelve可以多次写入，存取也比较方便

1. shelve模块是一个简单的k,v将内存数据通过文件持久化的模块，可以持久化任何pickle可支持的python数据格式

import shelve

d = shelve.open("mydbase")
name = ["zhangsan","lisi","wangmz"]

d["test"] = name #持久化列表
d["age"] = 20 

d.close()

import shelve

dbase = shelve.open("mydbase")
print(dbase.keys())
print(dbase['test'])

for i in dbase:
    print(i)

d.close()

2. json模块

#json序列化
import json

a = {"tony":22, 'james':34}
with open('text.txt','w') as f:
    f.write(json.dumps(a))

#json反序列化
import json
with open('text.txt', 'r') as f:
    x = json.load(f)
    print(x["james"])

 3. pickele