內建json模組對於python內建型別序列化的描述
"""extensible json encoder for python data structures.
supports the following objects and types by default:
+-------------------+---------------+
| python | json |
+***************====+***************+
| dict | object |
+-------------------+---------------+
| list, tuple | array |
+-------------------+---------------+
| str | string |
+-------------------+---------------+
| int, float | number |
+-------------------+---------------+
| true | true |
+-------------------+---------------+
| false | false |
+-------------------+---------------+
| none | null |
+-------------------+---------------+
to extend this to recognize other objects, subclass and implement a
``.default()`` method with another method that returns a serializable
object for ``o`` if possible, otherwise it should call the superclass
implementation (to raise ``typeerror``).
"""
"""****** json decoder
performs the following translations in decoding by default:
+---------------+-------------------+
| json | python |
+***************+***************====+
| object | dict |
+---------------+-------------------+
| array | list |
+---------------+-------------------+
| string | str |
+---------------+-------------------+
| number (int) | int |
+---------------+-------------------+
| number (real) | float |
+---------------+-------------------+
| true | true |
+---------------+-------------------+
| false | false |
+---------------+-------------------+
| null | none |
+---------------+-------------------+
it also understands ``nan``, ``infinity``, and ``-infinity`` as
their corresponding ``float`` values, which is outside the json spec.
"""
'''
'''class
person()
:"""人類"""
# __slots__ = ['age']
# __dict__ = ['age', 'name']
_age:
int=
0def
__init__
(self, age, name=
'eason'):
# json.jsonencoder.__init__(self, skipkeys=true)
self.age = age
self.name = name
# self.name = name
# def __dir__(self):
# return ['age', 'name']
@property
defage
(self)
->
int:
return self._age
@age.setter
defage(self, age:
int)
:print
('set age'
)if age <=0:
raise valueerror(
'age'
) self._age = age
defhello
(self)
:print
('**********====hello-locals***************'
)print
(locals()
)
import pickle
import json
from demo.src.models.person import person
# import demo.src.models.person.person
class
personjsonencoder
(json.jsonencoder)
:def
default
(self, o: person)
:# 返回字典型別
return
# def encode(self, o: person):
# # 直接返回字典，
# return str()
class
personjsondecoder
(json.jsondecoder)
:def
decode
(self, s:
str)
: obj_dict = json.loads(s)
# return person(obj_dict['age'], obj_dict['age'])
return person(
**obj_dict)
p = person(28,
'wjchi'
)# bytes
# p_bytes = pickle.dumps(p)
# print(type(p_bytes), p_bytes)
# p_obj = pickle.loads(p_bytes)
# print(type(p_obj), p_obj.age)
# string
# p_str = json.dumps(p, default=lambda obj: obj.__dict__)
# print(type(p_str), p_str)
# p_dict = json.loads(p_str)
# print(type(p_dict), p_dict['age'])
p_str = json.dumps(p, cls=personjsonencoder)
print
(type
(p_str)
, p_str)
p_dict = json.loads(p_str)
# print(type(p_dict), p_dict['age'])
# p_obj = json.loads(p_str, cls=personjsondecoder)
p_obj = person(
**p_dict)
print
(type
(p_obj)
, p_obj.age)
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