Package: mjson5
pyjson5A Python implementation of the JSON5 data format.JSON5extends theJSONdata interchange format to make it
slightly more usable as a configuration language:JavaScript-style comments (both single and multi-line) are legal.Object keys may be unquoted if they are legal ECMAScript identifiersObjects and arrays may end with trailing commas.Strings can be single-quoted, and multi-line string literals are allowed.There are a few other more minor extensions to JSON; see the above page for
the full details.This project implements a reader and writer implementation for Python;
where possible, it mirrors thestandard Python JSON APIpackage for ease of use.There is one notable difference from the JSON api: theload()andloads()methods support optionally checking for (and rejecting) duplicate
object keys; passallow_duplicate_keys=Falseto do so (duplicates are
allowed by default).This is an early release. It has been reasonably well-tested, but it isSLOW. It can be 1000-6000x slower than the C-optimized JSON module,
and is 200x slower (or more) than the pure Python JSON module.Please Note:This library only handles JSON5 documents, it does not
allow you to read arbitrary JavaScript. For example, bare integers can
be legal object keys in JavaScript, but they aren't in JSON5.Known issuesDid I mention that it isSLOW?The implementation follows Python3'sjsonimplementation where
possible. This means that theencodingmethod todump()is
ignored, and unicode strings are always returned.Theclskeyword argument thatjson.load()/json.loads()accepts
to specify a custom subclass ofJSONDecoderis not and will not be
supported, because this implementation uses a completely different
approach to parsing strings and doesn't have anything like theJSONDecoderclass.Theclskeyword argument thatjson.dump()/json.dumps()accepts
is also not supported, for consistency withjson5.load(). Thedefaultkeywordissupported, though, and might be able to serve as a
workaround.Running the testsTo run the tests, setup a venv and install the required dependencies withpip install -e '.[dev]', then run the tests withpython setup.py test.Version History / Release Notesv0.9.13 (2023-03-16)GitHub PR #64Remove a field from one of the JSON benchmark files to
reduce confusion in Chromium.No code changes.v0.9.12 (2023-01-02)Fix GitHub Actions config file to no longer test against
Python 3.6 or 3.7. For now we will only test against an
"oldest" release (3.8 in this case) and a "current"
release (3.11 in this case).v0.9.11 (2023-01-02)GitHub issue #60Fixed minor Python2 compatibility issue by referring tofloat("inf")instead ofmath.inf.v0.9.10 (2022-08-18)GitHub issue #58Updated the //README.md to be clear that parsing arbitrary JS
code may not work.Otherwise, no code changes.v0.9.9 (2022-08-01)GitHub issue #57Fixed serialization for objects that subclassintorfloat:
Previously we would use the objectsstrimplementation, but
that might result in an illegal JSON5 value if the object had
customizedstrto return something illegal. Instead,
we follow the lead of theJSONmodule and callint.__repr__orfloat.__repr__directly.While I was at it, I added tests for dumps(-inf) and dumps(nan)
when those were supposed to be disallowed byallow_nan=False.v0.9.8 (2022-05-08)GitHub issue #47Fixed error reporting in some cases due to how parsing was handling
nested rules in the grammar - previously the reported location for
the error could be far away from the point where it actually happened.v0.9.7 (2022-05-06)GitHub issue #52Fixed behavior ofdefaultfn indumpanddumps. Previously
we didn't require the function to return a string, and so we could
end up returning something that wasn't actually valid. This change
now matches the behavior in thejsonmodule.Note: This is a
potentially breaking change.v0.9.6 (2021-06-21)Bump development status classifier to 5 - Production/Stable, which
the library feels like it is at this point. If I do end up significantly
reworking things to speed it up and/or to add round-trip editing,
that'll likely be a 2.0. If this version has no reported issues,
I'll likely promote it to 1.0.Also bump the tested Python versions to 2.7, 3.8 and 3.9, though
earlier Python3 versions will likely continue to work as well.GitHub issue #46Fix incorrect serialization of custom subtypesMake it possible to run the tests ifhypothesisisn't installed.v0.9.5 (2020-05-26)Miscellaneous non-source cleanups in the repo, including setting
up GitHub Actions for a CI system. No changes to the library from
v0.9.4, other than updating the version.v0.9.4 (2020-03-26)GitHub pull #38Fix fromfredrik@fornwall.netfor dumps() crashing when passed
an empty string as a key in an object.v0.9.3 (2020-03-17)GitHub pull #35Fix from pastelmind@ for dump() not passing the right args to dumps().Fix fromp.skouzos@novafutur.comto remove the tests directory from
the setup call, making the package a bit smaller.v0.9.2 (2020-03-02)GitHub pull #34Fix from roosephu@ for a badly formatted nested list.v0.9.1 (2020-02-09)GitHub issue #33:
Fix stray trailing comma when dumping an object with an invalid key.v0.9.0 (2020-01-30)GitHub issue #29:
Fix an issue where objects keys that started with a reserved
word were incorrectly quoted.GitHub issue #30:
Fix an issue where dumps() incorrectly thought a data structure
was cyclic in some cases.GitHub issue #32:
Allow for non-string keys in dicts passed todump()/dumps().
Add anallow_duplicate_keys=Falseto prevent possible
ill-formed JSON that might result.v0.8.5 (2019-07-04)GitHub issue #25:
Add LICENSE and README.md to the dist.GitHub issue #26:
Fix printing of empty arrays and objects with indentation, fix
misreporting of the position on parse failures in some cases.v0.8.4 (2019-06-11)Updated the version history, too.v0.8.3 (2019-06-11)Tweaked the README, bumped the version, forgot to update the version
history :).v0.8.2 (2019-06-11)Actually bump the version properly, to 0.8.2.v0.8.1 (2019-06-11)Fix bug in setup.py that messed up the description. Unfortunately,
I forgot to bump the version for this, so this also identifies as 0.8.0.v0.8.0 (2019-06-11)Addallow_duplicate_keys=Trueas a default argument tojson5.load()/json5.loads(). If you set the key toFalse, duplicate
keys in a single dict will be rejected. The default is set toTruefor compatibility withjson.load(), earlier versions of json5, and
because it's simply not clear if people would want duplicate checking
enabled by default.v0.7 (2019-03-31)Changes dump()/dumps() to not quote object keys by default if they are
legal identifiers. Passingquote_keys=Truewill turn that off
and always quote object keys.Changes dump()/dumps() to insert trailing commas after the last item
in an array or an object if the object is printed across multiple lines
(i.e., ifindentis not None). Passingtrailing_commas=Falsewill
turn that off.Thejson5.toolcommand line tool now supports the--indent,--[no-]quote-keys, and--[no-]trailing-commasflags to allow
for more control over the output, in addition to the existing--as-jsonflag.Thejson5.toolcommand line tool no longer supports reading from
multiple files, you can now only read from a single file or
from standard input.The implementation no longer relies on the standardjsonmodule
for anything. The output should still match the json module (except
as noted above) and discrepancies should be reported as bugs.v0.6.2 (2019-03-08)FixGitHub issue #23and
pass through unrecognized escape sequences.v0.6.1 (2018-05-22)Cleaned up a couple minor nits in the package.v0.6.0 (2017-11-28)First implementation that attempted to implement 100% of the spec.v0.5.0 (2017-09-04)First implementation that supported the full set of kwargs that
thejsonmodule supports.