[Python-checkins] cpython (2.7): explain json.dumps for non-string keys in dicts. closes issue6566. Patch
senthil.kumaran
python-checkins at python.org
Sat Mar 17 08:41:25 CET 2012
http://hg.python.org/cpython/rev/7c818b4cd98a
changeset: 75777:7c818b4cd98a
branch: 2.7
parent: 75768:55993cd25564
user: Senthil Kumaran <senthil at uthcode.com>
date: Sat Mar 17 00:37:38 2012 -0700
summary:
explain json.dumps for non-string keys in dicts. closes issue6566. Patch contributed Kirubakaran Athmanathan
files:
Doc/library/json.rst | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/Doc/library/json.rst b/Doc/library/json.rst
--- a/Doc/library/json.rst
+++ b/Doc/library/json.rst
@@ -170,6 +170,14 @@
:class:`unicode` instance. The other arguments have the same meaning as in
:func:`dump`.
+ .. note::
+
+ Keys in key/value pairs of JSON are always of the type :class:`str`. When
+ a dictionary is converted into JSON, all the keys of the dictionary are
+ coerced to strings. As a result of this, if a dictionary is convered
+ into JSON and then back into a dictionary, the dictionary may not equal
+ the original one. That is, ``loads(dumps(x)) != x`` if x has non-string
+ keys.
.. function:: load(fp[, encoding[, cls[, object_hook[, parse_float[, parse_int[, parse_constant[, object_pairs_hook[, **kw]]]]]]]])
--
Repository URL: http://hg.python.org/cpython
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