python json,pickle,shelve

'' ' 
Json: 
    for data exchange between different programs 
    dumps loads: json format handler 
    dump load: mainly used to read and write file functions json 
pickle: 
    mainly used to read and write functions json file, to read and store all the word section form. Functions and almost json 
The shelve: 
    The shelve module is simpler than pickle module, open only a function that returns a dictionary-like objects, readable and writable 
'' ' 
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 (): 
    Open with (file_path, 'W') AS f_write, \ 
        Open (file_path, 'R & lt') AS f_read: 
        The json.dump (DN, f_write) 
        f_write.close () 
        Data = JSON.


    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()