序列化心得

import json

json--一次性写进去，一次性读出来

dict = {1:'中国‘， 2:'b'}

f = open('f','w')

json.dump(dict, f)----显示bytes,不影响读写

json.dump(dict, f, ensure_ascii=False)----显示中文

使用json多次读入

l = [{'k': 111}, {'k2':222}, {'k3':333}]
f = open('f', 'w')
for dict in l:
    str_dict = json.dumps(dict)
    print(str_dict)
    f.write(str_dict+'
')
f.close()

多次读出

import json
l = []
with open('f') as f:
    for line in f:
        dict = json.loads(line.strip())
        l.append(dict)

 pickl---wb，rb，读入python任何数据，支持多次读入与读出

import pickle
a = [1,2,3]
b = [4,5,6]
with open('f','rb') as f:
    a ,b = pickle.load(f)

import shelve
f = shelve.open('shelve_f')
f['key'] = {'a':1, 'b':3}
f.close()

import shelve
f = shelve.open('shelve_f')
existing = f['key']
f.close()
print(existing)