On Aug 8, 2019, at 13:43, [email protected] wrote:
>
> You have overwritten the wrong method:
Unfortunately, he hasn’t. Overriding encode isn’t particularly useful.
> $ cat demo.py
> import io
> import json
> import decimal
>
> class DecimalEncoder(json.JSONEncoder):
> def encode(self, o):
> if isinstance(o, decimal.Decimal):
> return str(o)
> return super().encode(o)
>
> input = "0.6441726684570313"
> obj = json.loads(input, parse_float=decimal.Decimal)
> output = json.dumps(obj, cls=DecimalEncoder)
> assert input == output
Try it with:
input = ["0.6441726684570313"]
You’ll get a TypeError because Decimal isn’t serializable.
The encode method doesn’t get called recursively; instead, a function gets
created that calls itself recursively, and encode calls that. So, any hooks you
add in encode only affect the top-level value, not values inside arrays or
objects.
_______________________________________________
Python-ideas mailing list -- [email protected]
To unsubscribe send an email to [email protected]
https://mail.python.org/mailman3/lists/python-ideas.python.org/
Message archived at
https://mail.python.org/archives/list/[email protected]/message/UBMDFBPQC7KEJBEPXQQXKXSHLXFSHYHH/
Code of Conduct: http://python.org/psf/codeofconduct/
