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gh-150820: Speed up json.dumps() for small documents by gaborbernat · Pull Request #150827 · python/cpython · GitHub

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gh-150820: Speed up json.dumps() for small documents #150827

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Merged
serhiy-storchaka merged 3 commits into from
Aug 11, 2026
Conversation 10 Commits 3 Checks 57 Files changed
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gh-150820: Speed up json.dumps() for small documents #150827

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167626b
gh-150820: Speed up json.loads() and json.dumps() for small documents
gaborbernat Jun 2, 2026
284d568
Split out the decode whitespace change to a separate PR
gaborbernat Jun 3, 2026
6380899
Drop the floatstr comment and trim the NEWS entry
gaborbernat Jun 3, 2026
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45 changes: 22 additions & 23 deletions Lib/json/encoder.py
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Original file line number Diff line number Diff line change
Expand Up @@ -223,29 +223,6 @@ def iterencode(self, o, _one_shot=False):
else:
_encoder = encode_basestring

def floatstr(o, allow_nan=self.allow_nan,
_repr=float.__repr__, _inf=INFINITY, _neginf=-INFINITY):
# Check for specials. Note that this type of test is processor
# and/or platform-specific, so do tests which don't depend on the
# internals.

if o != o:
text = 'NaN'
elif o == _inf:
text = 'Infinity'
elif o == _neginf:
text = '-Infinity'
else:
return _repr(o)

if not allow_nan:
raise ValueError(
"Out of range float values are not JSON compliant: " +
repr(o))

return text


if self.indent is None or isinstance(self.indent, str):
indent = self.indent
else:
Expand All @@ -256,6 +233,28 @@ def floatstr(o, allow_nan=self.allow_nan,
self.key_separator, self.item_separator, self.sort_keys,
self.skipkeys, self.allow_nan)
else:
def floatstr(o, allow_nan=self.allow_nan,
_repr=float.__repr__, _inf=INFINITY, _neginf=-INFINITY):
# Check for specials. Note that this type of test is processor
# and/or platform-specific, so do tests which don't depend on
# the internals.

if o != o:
text = 'NaN'
elif o == _inf:
text = 'Infinity'
elif o == _neginf:
text = '-Infinity'
else:
return _repr(o)

if not allow_nan:
raise ValueError(
"Out of range float values are not JSON compliant: " +
repr(o))

return text

_iterencode = _make_iterencode(
markers, self.default, _encoder, indent, floatstr,
self.key_separator, self.item_separator, self.sort_keys,
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2026-06-02-15-45-00.gh-issue-150820.W7tpO7.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Speed up :func:`json.dumps` for small documents. Patch by Bernát Gábor.
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