https://github.com/python/cpython/commit/4d3075655e8bfddb6f5015b43aade43b1265bd65
commit: 4d3075655e8bfddb6f5015b43aade43b1265bd65
branch: main
author: Bernát Gábor <[email protected]>
committer: serhiy-storchaka <[email protected]>
date: 2026-08-11T18:52:43+03:00
summary:
gh-150820: Speed up json.dumps() for small documents (GH-150827)
Only create the float formatting helper when the pure Python encoder is used.
files:
A Misc/NEWS.d/next/Library/2026-06-02-15-45-00.gh-issue-150820.W7tpO7.rst
M Lib/json/encoder.py
diff --git a/Lib/json/encoder.py b/Lib/json/encoder.py
index 718b3254241c565..8768b63a3f80417 100644
--- a/Lib/json/encoder.py
+++ b/Lib/json/encoder.py
@@ -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:
@@ -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,
diff --git
a/Misc/NEWS.d/next/Library/2026-06-02-15-45-00.gh-issue-150820.W7tpO7.rst
b/Misc/NEWS.d/next/Library/2026-06-02-15-45-00.gh-issue-150820.W7tpO7.rst
new file mode 100644
index 000000000000000..ae9858f5294183a
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-06-02-15-45-00.gh-issue-150820.W7tpO7.rst
@@ -0,0 +1 @@
+Speed up :func:`json.dumps` for small documents. Patch by Bernát Gábor.
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