python json,pickle,shelve

'''
json:
    用于不同程序之间的数据交换
    dumps loads:json格式处理函数
    dump load：主要用来读写json文件函数
pickle：
    主要用来读写json文件函数，读取和存储都以字节形式。函数和json的差不多
shelve：
    shelve模块比pickle模块简单，只有一个open函数，返回类似字典的对象，可读可写
'''
file_path = 'json.txt'
dn = {'baidu': 'www.baidu.com', 'qq': 'www.qq.com', '360': 'www.360.cn'}
name = ['mayun', 'mahuateng', 'liyanhong']
import json
def json_dump():
    with open(file_path,'w') as f_write,\
        open(file_path,'r') as f_read:
        json.dump(dn,f_write)
        f_write.close()
        data = json.load(f_read)
        print(data)
def json_dumps():
    with open(file_path,'w') as f_write,\
        open(file_path,'r') as f_read:
        f_write.write(json.dumps(dn))
        f_write.close()
        data = f_read.read()
        dicts = json.loads(data)
        print(dicts)

import pickle
def pickle_dump():
    with open(file_path,'wb') as f_write,\
        open(file_path,'rb') as f_read:
        pickle.dump(dn,f_write)      ##写一个对象
        pickle.dump(name,f_write)  ##再写一个对象
        f_write.close()

        data=pickle.load(f_read)
        print(data)
        data = pickle.load(f_read)
        print(data)

import shelve
def shelve_test():
    f = shelve.open(file_path)
    f['baidu'] = 'www.baidu.com'
    f['qq'] = 'www.qq.com'
    f['360'] = 'www.360.cn'
    f.close()
    f = shelve.open(file_path)
    print(dict(f))
if __name__ == '__main__':
    # json_dump()
    # json_dumps()
    # pickle_dump()
    shelve_test()