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gh-146440: Add "array_hook" parameter to JSON decoders #146441

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Merged
vstinner merged 21 commits into from
Mar 27, 2026
Merged

gh-146440: Add "array_hook" parameter to JSON decoders #146441

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ced66ad
array_hook for JSON decoder
jsbueno Mar 20, 2026
cdb6dcf
Update documentation for array_hook parameter
jsbueno Mar 24, 2026
c7b77ee
📜🤖 Added by blurb_it.
blurb-it[bot] Mar 26, 2026
be6cb37
Fix typo in news blurb
jsbueno Mar 26, 2026
2820503
Fix doc formatting
jsbueno Mar 26, 2026
b079384
Doc typo
jsbueno Mar 26, 2026
7ff9a73
'What's New' entry
jsbueno Mar 26, 2026
47072c3
Remove redundant default parameters
jsbueno Mar 26, 2026
9cd60a5
Fix blurb content + formatting
jsbueno Mar 26, 2026
6e48297
Formatting and missing parameter to JSONDecoder
jsbueno Mar 26, 2026
0eed2fb
Reformat blurb
jsbueno Mar 26, 2026
ee285ae
Merge branch 'main' into feature-json-array-hook
jsbueno Mar 26, 2026
2942826
Update Doc/whatsnew/3.15.rst
jsbueno Mar 26, 2026
227b52d
Linting fixes
jsbueno Mar 27, 2026
58d8897
Capitalization typo
jsbueno Mar 27, 2026
2a9cdd5
PEP 7 + Py_IsNone macro in functions touched
jsbueno Mar 27, 2026
9dc1258
Revert "PEP 7 + Py_IsNone macro in functions touched"
jsbueno Mar 27, 2026
fc82117
Change version to 'next'
jsbueno Mar 27, 2026
c4d6b37
Nested list + frozendict testcase
jsbueno Mar 27, 2026
8ea13ff
Apply suggestions from code review
vstinner Mar 27, 2026
d1e2077
Apply suggestions from code review
vstinner Mar 27, 2026
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Co-authored-by: Victor Stinner <[email protected]>
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@vstinner
vstinner authored Mar 27, 2026
commit 8ea13ffea8550ec527417e1c8095ef103d49dfb4
8 changes: 4 additions & 4 deletions Lib/json/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -275,8 +275,8 @@ def detect_encoding(b):


def load(fp, *, cls=None, object_hook=None, parse_float=None,
parse_int=None, parse_constant=None, object_pairs_hook=None,
array_hook=None, **kw):
parse_int=None, parse_constant=None, object_pairs_hook=None,
array_hook=None, **kw):
"""Deserialize ``fp`` (a ``.read()``-supporting file-like object containing
a JSON document) to a Python object.

Expand Down Expand Up @@ -310,8 +310,8 @@ def load(fp, *, cls=None, object_hook=None, parse_float=None,


def loads(s, *, cls=None, object_hook=None, parse_float=None,
parse_int=None, parse_constant=None, object_pairs_hook=None,
array_hook=None, **kw):
parse_int=None, parse_constant=None, object_pairs_hook=None,
array_hook=None, **kw):
"""Deserialize ``s`` (a ``str``, ``bytes`` or ``bytearray`` instance
containing a JSON document) to a Python object.

Expand Down
2 changes: 2 additions & 0 deletions Lib/test/test_json/test_decode.py
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Expand Up @@ -74,6 +74,7 @@ def test_array_hook(self):
t = self.loads(s, array_hook=tuple)
self.assertEqual(t, (1, 2, 3))
self.assertEqual(type(t), tuple)

# Nested array in inner structure with object_hook
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s = '{"xkd": [[1], [2], [3]]}'
p = frozendict(xkd=((1,), (2,), (3,)))
Expand All @@ -83,6 +84,7 @@ def test_array_hook(self):
self.assertEqual(type(data["xkd"]), tuple)
for item in data["xkd"]:
self.assertEqual(type(item), tuple)

self.assertEqual(self.loads('[]', array_hook=tuple), ())
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def test_decoder_optimizations(self):
Expand Down
3 changes: 2 additions & 1 deletion Modules/_json.c
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Expand Up @@ -1270,8 +1270,9 @@ scanner_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
if (s->object_pairs_hook == NULL)
goto bail;
s->array_hook = PyObject_GetAttrString(ctx, "array_hook");
if (s->array_hook == NULL)
if (s->array_hook == NULL) {
goto bail;
}
s->parse_float = PyObject_GetAttrString(ctx, "parse_float");
if (s->parse_float == NULL)
goto bail;
Expand Down
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