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| author | Raymond Hettinger <python@rcn.com> | 2009-04-21 03:27:12 (GMT) |
|---|---|---|
| committer | Raymond Hettinger <python@rcn.com> | 2009-04-21 03:27:12 (GMT) |
| commit | 9b8d069b319feb18b8ae91e26533af46a69be997 (patch) | |
| tree | 059f5f18162a05e9f1c27ffb533e11ef3e1b3ca8 /Doc/library/json.rst | |
| parent | 0ad98d8509764ee3947c481103e1e735cc048305 (diff) | |
| download | cpython-9b8d069b319feb18b8ae91e26533af46a69be997.zip cpython-9b8d069b319feb18b8ae91e26533af46a69be997.tar.gz cpython-9b8d069b319feb18b8ae91e26533af46a69be997.tar.bz2 | |
Forward port r70471: Add object_pairs_hook. Issue 5381.
Diffstat (limited to 'Doc/library/json.rst')
| -rw-r--r-- | Doc/library/json.rst | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/Doc/library/json.rst b/Doc/library/json.rst index bd31a31..edaf657 100644 --- a/Doc/library/json.rst +++ b/Doc/library/json.rst @@ -165,7 +165,7 @@ Basic Usage :func:`dump`. -.. function:: load(fp[, encoding[, cls[, object_hook[, parse_float[, parse_int[, parse_constant[, **kw]]]]]]]) +.. function:: load(fp[, encoding[, cls[, object_hook[, parse_float[, parse_int[, parse_constant[, object_pairs_hook[, **kw]]]]]]]]) Deserialize *fp* (a ``.read()``-supporting file-like object containing a JSON document) to a Python object. @@ -181,6 +181,17 @@ Basic Usage *object_hook* will be used instead of the :class:`dict`. This feature can be used to implement custom decoders (e.g. JSON-RPC class hinting). + *object_pairs_hook* is an optional function that will be called with the + result of any object literal decode with an ordered list of pairs. The + return value of *object_pairs_hook* will be used instead of the + :class:`dict`. This feature can be used to implement custom decoders that + rely on the order that the key and value pairs are decoded (for example, + :func:`collections.OrderedDict` will remember the order of insertion). If + *object_hook* is also defined, the *object_pairs_hook* takes priority. + + .. versionchanged:: 3.1 + Added support for *object_pairs_hook*. + *parse_float*, if specified, will be called with the string of every JSON float to be decoded. By default, this is equivalent to ``float(num_str)``. This can be used to use another datatype or parser for JSON floats @@ -201,7 +212,7 @@ Basic Usage class. -.. function:: loads(s[, encoding[, cls[, object_hook[, parse_float[, parse_int[, parse_constant[, **kw]]]]]]]) +.. function:: loads(s[, encoding[, cls[, object_hook[, parse_float[, parse_int[, parse_constant[, object_pairs_hook[, **kw]]]]]]]]) Deserialize *s* (a :class:`str` or :class:`unicode` instance containing a JSON document) to a Python object. @@ -217,7 +228,7 @@ Basic Usage Encoders and decoders --------------------- -.. class:: JSONDecoder([encoding[, object_hook[, parse_float[, parse_int[, parse_constant[, strict]]]]]]) +.. class:: JSONDecoder([encoding[, object_hook[, parse_float[, parse_int[, parse_constant[, strict[, object_pairs_hook]]]]]]]) Simple JSON decoder. @@ -258,6 +269,17 @@ Encoders and decoders :class:`dict`. This can be used to provide custom deserializations (e.g. to support JSON-RPC class hinting). + *object_pairs_hook*, if specified will be called with the result of every + JSON object decoded with an ordered list of pairs. The return value of + *object_pairs_hook* will be used instead of the :class:`dict`. This + feature can be used to implement custom decoders that rely on the order + that the key and value pairs are decoded (for example, + :func:`collections.OrderedDict` will remember the order of insertion). If + *object_hook* is also defined, the *object_pairs_hook* takes priority. + + .. versionchanged:: 3.1 + Added support for *object_pairs_hook*. + *parse_float*, if specified, will be called with the string of every JSON float to be decoded. By default, this is equivalent to ``float(num_str)``. This can be used to use another datatype or parser for JSON floats |