New submission from xie <[email protected]>:
I see an example from hereļ¼https://docs.python.org/3/library/json.html
------It is about custom method from python object to json string:-----
import json
class ComplexEncoder(json.JSONEncoder):
def default(self, obj):
print("hi")
if isinstance(obj, complex):
return [obj.real, obj.imag]
# Let the base class default method raise the TypeError
return json.JSONEncoder.default(self, obj)
s2=json.dumps(2 + 1j, cls=ComplexEncoder)
print(s2)
-------I wrote an program like it,but not the result I want:-------
class MyEncoder(json.JSONEncoder):
def default(self,obj):
print("hi")
if isinstance(obj,dict):
print("it is dict!")
return obj["name"]
return json.JSONEncoder.default(self,obj)
print(MyEncoder().encode({"name":"sun","age":40}))
jsonStr=json.dumps({"name":"wang","age":30},cls=MyEncoder)
print(jsonStr)
--------the result of the program is:---------
{"name": "sun", "age": 40}
{"name": "wang", "age": 30}
--------I think it should be:---------
sun
wang
what I missed?I am very confused.
----------
messages: 367912
nosy: xsmyqf
priority: normal
severity: normal
status: open
title: json.JSONEncoder override default method
type: behavior
versions: Python 3.7
_______________________________________
Python tracker <[email protected]>
<https://bugs.python.org/issue40475>
_______________________________________
_______________________________________________
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
