python模块 json

只支持列表、元组、字典

1. 序列化

>>> import json
>>> 
>>> f = open("user_acc.txt","w")
>>> 
>>> info = {
...     "alex":"123",
...     "jack":"4444"
... }
>>> 
>>> f.write(json.dumps(info))
31
>>> 
>>> f.close()
>>> 
>>> f = open("user_acc.txt","r")
>>> data_from_atm = json.loads(f.read())
>>> print(type(data_from_atm))
<class 'dict'>
>>> print(data_from_atm)
{'jack': '4444', 'alex': '123'}
>>> f.close()