New submission from Michael Smith <[email protected]>:
If a mappingproxy object is a read-only proxy to a mapping, would it make sense
for them to JSON serialize just like the mapping they come from? Currently,
json.dumps throws the "I don't know how to serialize this" error:
$ python -c 'import json
> import types
> json.dumps(types.MappingProxyType({}))'
Traceback (most recent call last):
File "<string>", line 3, in <module>
File "/usr/lib64/python3.6/json/__init__.py", line 231, in dumps
return _default_encoder.encode(obj)
File "/usr/lib64/python3.6/json/encoder.py", line 199, in encode
chunks = self.iterencode(o, _one_shot=True)
File "/usr/lib64/python3.6/json/encoder.py", line 257, in iterencode
return _iterencode(o, 0)
File "/usr/lib64/python3.6/json/encoder.py", line 180, in default
o.__class__.__name__)
TypeError: Object of type 'mappingproxy' is not JSON serializable
----------
components: Library (Lib)
messages: 326756
nosy: Michael Smith2
priority: normal
severity: normal
status: open
title: MappingProxy objects should JSON serialize just like a dictionary
type: behavior
versions: Python 3.4, Python 3.5, Python 3.6, Python 3.7, Python 3.8
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Python tracker <[email protected]>
<https://bugs.python.org/issue34858>
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