On Aug 8, 2019, at 13:43, __pete...@web.de 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.
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