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+:mod:`simplejson` --- JSON encoder and decoder |
+============================================== |
+ |
+.. module:: simplejson |
+ :synopsis: Encode and decode the JSON format. |
+.. moduleauthor:: Bob Ippolito <bob@redivi.com> |
+.. sectionauthor:: Bob Ippolito <bob@redivi.com> |
+ |
+JSON (JavaScript Object Notation) <http://json.org> is a subset of JavaScript |
+syntax (ECMA-262 3rd edition) used as a lightweight data interchange format. |
+ |
+:mod:`simplejson` exposes an API familiar to users of the standard library |
+:mod:`marshal` and :mod:`pickle` modules. It is the externally maintained |
+version of the :mod:`json` library contained in Python 2.6, but maintains |
+compatibility with Python 2.4 and Python 2.5 and (currently) has |
+significant performance advantages, even without using the optional C |
+extension for speedups. |
+ |
+Encoding basic Python object hierarchies:: |
+ |
+ >>> import simplejson as json |
+ >>> json.dumps(['foo', {'bar': ('baz', None, 1.0, 2)}]) |
+ '["foo", {"bar": ["baz", null, 1.0, 2]}]' |
+ >>> print json.dumps("\"foo\bar") |
+ "\"foo\bar" |
+ >>> print json.dumps(u'\u1234') |
+ "\u1234" |
+ >>> print json.dumps('\\') |
+ "\\" |
+ >>> print json.dumps({"c": 0, "b": 0, "a": 0}, sort_keys=True) |
+ {"a": 0, "b": 0, "c": 0} |
+ >>> from StringIO import StringIO |
+ >>> io = StringIO() |
+ >>> json.dump(['streaming API'], io) |
+ >>> io.getvalue() |
+ '["streaming API"]' |
+ |
+Compact encoding:: |
+ |
+ >>> import simplejson as json |
+ >>> json.dumps([1,2,3,{'4': 5, '6': 7}], separators=(',',':')) |
+ '[1,2,3,{"4":5,"6":7}]' |
+ |
+Pretty printing:: |
+ |
+ >>> import simplejson as json |
+ >>> s = json.dumps({'4': 5, '6': 7}, sort_keys=True, indent=4) |
+ >>> print '\n'.join([l.rstrip() for l in s.splitlines()]) |
+ { |
+ "4": 5, |
+ "6": 7 |
+ } |
+ |
+Decoding JSON:: |
+ |
+ >>> import simplejson as json |
+ >>> obj = [u'foo', {u'bar': [u'baz', None, 1.0, 2]}] |
+ >>> json.loads('["foo", {"bar":["baz", null, 1.0, 2]}]') == obj |
+ True |
+ >>> json.loads('"\\"foo\\bar"') == u'"foo\x08ar' |
+ True |
+ >>> from StringIO import StringIO |
+ >>> io = StringIO('["streaming API"]') |
+ >>> json.load(io)[0] == 'streaming API' |
+ True |
+ |
+Specializing JSON object decoding:: |
+ |
+ >>> import simplejson as json |
+ >>> def as_complex(dct): |
+ ... if '__complex__' in dct: |
+ ... return complex(dct['real'], dct['imag']) |
+ ... return dct |
+ ... |
+ >>> json.loads('{"__complex__": true, "real": 1, "imag": 2}', |
+ ... object_hook=as_complex) |
+ (1+2j) |
+ >>> import decimal |
+ >>> json.loads('1.1', parse_float=decimal.Decimal) == decimal.Decimal('1.1') |
+ True |
+ |
+Specializing JSON object encoding:: |
+ |
+ >>> import simplejson as json |
+ >>> def encode_complex(obj): |
+ ... if isinstance(obj, complex): |
+ ... return [obj.real, obj.imag] |
+ ... raise TypeError(repr(o) + " is not JSON serializable") |
+ ... |
+ >>> json.dumps(2 + 1j, default=encode_complex) |
+ '[2.0, 1.0]' |
+ >>> json.JSONEncoder(default=encode_complex).encode(2 + 1j) |
+ '[2.0, 1.0]' |
+ >>> ''.join(json.JSONEncoder(default=encode_complex).iterencode(2 + 1j)) |
+ '[2.0, 1.0]' |
+ |
+ |
+.. highlight:: none |
+ |
+Using :mod:`simplejson.tool` from the shell to validate and pretty-print:: |
+ |
+ $ echo '{"json":"obj"}' | python -m simplejson.tool |
+ { |
+ "json": "obj" |
+ } |
+ $ echo '{ 1.2:3.4}' | python -m simplejson.tool |
+ Expecting property name: line 1 column 2 (char 2) |
+ |
+.. highlight:: python |
+ |
+.. note:: |
+ |
+ The JSON produced by this module's default settings is a subset of |
+ YAML, so it may be used as a serializer for that as well. |
+ |
+ |
+Basic Usage |
+----------- |
+ |
+.. function:: dump(obj, fp[, skipkeys[, ensure_ascii[, check_circular[, allow_nan[, cls[, indent[, separators[, encoding[, default[, **kw]]]]]]]]]]) |
+ |
+ Serialize *obj* as a JSON formatted stream to *fp* (a ``.write()``-supporting |
+ file-like object). |
+ |
+ If *skipkeys* is true (default: ``False``), then dict keys that are not |
+ of a basic type (:class:`str`, :class:`unicode`, :class:`int`, :class:`long`, |
+ :class:`float`, :class:`bool`, ``None``) will be skipped instead of raising a |
+ :exc:`TypeError`. |
+ |
+ If *ensure_ascii* is false (default: ``True``), then some chunks written |
+ to *fp* may be :class:`unicode` instances, subject to normal Python |
+ :class:`str` to :class:`unicode` coercion rules. Unless ``fp.write()`` |
+ explicitly understands :class:`unicode` (as in :func:`codecs.getwriter`) this |
+ is likely to cause an error. It's best to leave the default settings, because |
+ they are safe and it is highly optimized. |
+ |
+ If *check_circular* is false (default: ``True``), then the circular |
+ reference check for container types will be skipped and a circular reference |
+ will result in an :exc:`OverflowError` (or worse). |
+ |
+ If *allow_nan* is false (default: ``True``), then it will be a |
+ :exc:`ValueError` to serialize out of range :class:`float` values (``nan``, |
+ ``inf``, ``-inf``) in strict compliance of the JSON specification. |
+ If *allow_nan* is true, their JavaScript equivalents will be used |
+ (``NaN``, ``Infinity``, ``-Infinity``). |
+ |
+ If *indent* is a non-negative integer, then JSON array elements and object |
+ members will be pretty-printed with that indent level. An indent level of 0 |
+ will only insert newlines. ``None`` (the default) selects the most compact |
+ representation. |
+ |
+ If specified, *separators* should be an ``(item_separator, dict_separator)`` |
+ tuple. By default, ``(', ', ': ')`` are used. To get the most compact JSON |
+ representation, you should specify ``(',', ':')`` to eliminate whitespace. |
+ |
+ *encoding* is the character encoding for str instances, default is |
+ ``'utf-8'``. |
+ |
+ If specified, *default* should be a function that gets called for objects |
+ that can't otherwise be serialized. It should return a JSON encodable |
+ version of the object or raise a :exc:`TypeError`. If not specified, |
+ :exc:`TypeError` is always raised in those cases. |
+ |
+ To use a custom :class:`JSONEncoder` subclass (e.g. one that overrides the |
+ :meth:`default` method to serialize additional types), specify it with the |
+ *cls* kwarg. |
+ |
+ .. note:: |
+ |
+ JSON is not a framed protocol so unlike :mod:`pickle` or :mod:`marshal` it |
+ does not make sense to serialize more than one JSON document without some |
+ container protocol to delimit them. |
+ |
+ |
+.. function:: dumps(obj[, skipkeys[, ensure_ascii[, check_circular[, allow_nan[, cls[, indent[, separators[, encoding[, default[, **kw]]]]]]]]]]) |
+ |
+ Serialize *obj* to a JSON formatted :class:`str`. |
+ |
+ If *ensure_ascii* is false, then the return value will be a |
+ :class:`unicode` instance. The other arguments have the same meaning as in |
+ :func:`dump`. Note that the default *ensure_ascii* setting has much |
+ better performance. |
+ |
+ |
+.. function:: load(fp[, encoding[, cls[, object_hook[, parse_float[, parse_int[, parse_constant[, **kw]]]]]]]) |
+ |
+ Deserialize *fp* (a ``.read()``-supporting file-like object containing a JSON |
+ document) to a Python object. |
+ |
+ If the contents of *fp* are encoded with an ASCII based encoding other than |
+ UTF-8 (e.g. latin-1), then an appropriate *encoding* name must be specified. |
+ Encodings that are not ASCII based (such as UCS-2) are not allowed, and |
+ should be wrapped with ``codecs.getreader(fp)(encoding)``, or simply decoded |
+ to a :class:`unicode` object and passed to :func:`loads`. The default |
+ setting of ``'utf-8'`` is fastest and should be using whenever possible. |
+ |
+ *object_hook* is an optional function that will be called with the result of |
+ any object literal decode (a :class:`dict`). The return value of |
+ *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). |
+ |
+ *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 |
+ (e.g. :class:`decimal.Decimal`). |
+ |
+ *parse_int*, if specified, will be called with the string of every JSON int |
+ to be decoded. By default, this is equivalent to ``int(num_str)``. This can |
+ be used to use another datatype or parser for JSON integers |
+ (e.g. :class:`float`). |
+ |
+ *parse_constant*, if specified, will be called with one of the following |
+ strings: ``'-Infinity'``, ``'Infinity'``, ``'NaN'``. This can be used to |
+ raise an exception if invalid JSON numbers are encountered. |
+ |
+ To use a custom :class:`JSONDecoder` subclass, specify it with the ``cls`` |
+ kwarg. Additional keyword arguments will be passed to the constructor of the |
+ class. |
+ |
+ .. note:: |
+ |
+ :func:`load` will read the rest of the file-like object as a string and |
+ then call :func:`loads`. It does not stop at the end of the first valid |
+ JSON document it finds and it will raise an error if there is anything |
+ other than whitespace after the document. Except for files containing |
+ only one JSON document, it is recommended to use :func:`loads`. |
+ |
+ |
+.. function:: loads(s[, encoding[, cls[, object_hook[, parse_float[, parse_int[, parse_constant[, **kw]]]]]]]) |
+ |
+ Deserialize *s* (a :class:`str` or :class:`unicode` instance containing a JSON |
+ document) to a Python object. |
+ |
+ If *s* is a :class:`str` instance and is encoded with an ASCII based encoding |
+ other than UTF-8 (e.g. latin-1), then an appropriate *encoding* name must be |
+ specified. Encodings that are not ASCII based (such as UCS-2) are not |
+ allowed and should be decoded to :class:`unicode` first. |
+ |
+ The other arguments have the same meaning as in :func:`load`. |
+ |
+ |
+Encoders and decoders |
+--------------------- |
+ |
+.. class:: JSONDecoder([encoding[, object_hook[, parse_float[, parse_int[, parse_constant[, strict]]]]]]) |
+ |
+ Simple JSON decoder. |
+ |
+ Performs the following translations in decoding by default: |
+ |
+ +---------------+-------------------+ |
+ | JSON | Python | |
+ +===============+===================+ |
+ | object | dict | |
+ +---------------+-------------------+ |
+ | array | list | |
+ +---------------+-------------------+ |
+ | string | unicode | |
+ +---------------+-------------------+ |
+ | number (int) | int, long | |
+ +---------------+-------------------+ |
+ | number (real) | float | |
+ +---------------+-------------------+ |
+ | true | True | |
+ +---------------+-------------------+ |
+ | false | False | |
+ +---------------+-------------------+ |
+ | null | None | |
+ +---------------+-------------------+ |
+ |
+ It also understands ``NaN``, ``Infinity``, and ``-Infinity`` as their |
+ corresponding ``float`` values, which is outside the JSON spec. |
+ |
+ *encoding* determines the encoding used to interpret any :class:`str` objects |
+ decoded by this instance (``'utf-8'`` by default). It has no effect when decoding |
+ :class:`unicode` objects. |
+ |
+ Note that currently only encodings that are a superset of ASCII work, strings |
+ of other encodings should be passed in as :class:`unicode`. |
+ |
+ *object_hook*, if specified, will be called with the result of every JSON |
+ object decoded and its return value will be used in place of the given |
+ :class:`dict`. This can be used to provide custom deserializations (e.g. to |
+ support JSON-RPC class hinting). |
+ |
+ *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 |
+ (e.g. :class:`decimal.Decimal`). |
+ |
+ *parse_int*, if specified, will be called with the string of every JSON int |
+ to be decoded. By default, this is equivalent to ``int(num_str)``. This can |
+ be used to use another datatype or parser for JSON integers |
+ (e.g. :class:`float`). |
+ |
+ *parse_constant*, if specified, will be called with one of the following |
+ strings: ``'-Infinity'``, ``'Infinity'``, ``'NaN'``. This can be used to |
+ raise an exception if invalid JSON numbers are encountered. |
+ |
+ *strict* controls the parser's behavior when it encounters an invalid |
+ control character in a string. The default setting of ``True`` means that |
+ unescaped control characters are parse errors, if ``False`` then control |
+ characters will be allowed in strings. |
+ |
+ .. method:: decode(s) |
+ |
+ Return the Python representation of *s* (a :class:`str` or |
+ :class:`unicode` instance containing a JSON document) |
+ |
+ .. method:: raw_decode(s) |
+ |
+ Decode a JSON document from *s* (a :class:`str` or :class:`unicode` |
+ beginning with a JSON document) and return a 2-tuple of the Python |
+ representation and the index in *s* where the document ended. |
+ |
+ This can be used to decode a JSON document from a string that may have |
+ extraneous data at the end. |
+ |
+ |
+.. class:: JSONEncoder([skipkeys[, ensure_ascii[, check_circular[, allow_nan[, sort_keys[, indent[, separators[, encoding[, default]]]]]]]]]) |
+ |
+ Extensible JSON encoder for Python data structures. |
+ |
+ Supports the following objects and types by default: |
+ |
+ +-------------------+---------------+ |
+ | Python | JSON | |
+ +===================+===============+ |
+ | dict | object | |
+ +-------------------+---------------+ |
+ | list, tuple | array | |
+ +-------------------+---------------+ |
+ | str, unicode | string | |
+ +-------------------+---------------+ |
+ | int, long, float | number | |
+ +-------------------+---------------+ |
+ | True | true | |
+ +-------------------+---------------+ |
+ | False | false | |
+ +-------------------+---------------+ |
+ | None | null | |
+ +-------------------+---------------+ |
+ |
+ To extend this to recognize other objects, subclass and implement a |
+ :meth:`default` method with another method that returns a serializable object |
+ for ``o`` if possible, otherwise it should call the superclass implementation |
+ (to raise :exc:`TypeError`). |
+ |
+ If *skipkeys* is false (the default), then it is a :exc:`TypeError` to |
+ attempt encoding of keys that are not str, int, long, float or None. If |
+ *skipkeys* is true, such items are simply skipped. |
+ |
+ If *ensure_ascii* is true (the default), the output is guaranteed to be |
+ :class:`str` objects with all incoming unicode characters escaped. If |
+ *ensure_ascii* is false, the output will be a unicode object. |
+ |
+ If *check_circular* is false (the default), then lists, dicts, and custom |
+ encoded objects will be checked for circular references during encoding to |
+ prevent an infinite recursion (which would cause an :exc:`OverflowError`). |
+ Otherwise, no such check takes place. |
+ |
+ If *allow_nan* is true (the default), then ``NaN``, ``Infinity``, and |
+ ``-Infinity`` will be encoded as such. This behavior is not JSON |
+ specification compliant, but is consistent with most JavaScript based |
+ encoders and decoders. Otherwise, it will be a :exc:`ValueError` to encode |
+ such floats. |
+ |
+ If *sort_keys* is true (the default), then the output of dictionaries |
+ will be sorted by key; this is useful for regression tests to ensure that |
+ JSON serializations can be compared on a day-to-day basis. |
+ |
+ If *indent* is a non-negative integer (it is ``None`` by default), then JSON |
+ array elements and object members will be pretty-printed with that indent |
+ level. An indent level of 0 will only insert newlines. ``None`` is the most |
+ compact representation. |
+ |
+ If specified, *separators* should be an ``(item_separator, key_separator)`` |
+ tuple. By default, ``(', ', ': ')`` are used. To get the most compact JSON |
+ representation, you should specify ``(',', ':')`` to eliminate whitespace. |
+ |
+ If specified, *default* should be a function that gets called for objects |
+ that can't otherwise be serialized. It should return a JSON encodable |
+ version of the object or raise a :exc:`TypeError`. |
+ |
+ If *encoding* is not ``None``, then all input strings will be transformed |
+ into unicode using that encoding prior to JSON-encoding. The default is |
+ ``'utf-8'``. |
+ |
+ |
+ .. method:: default(o) |
+ |
+ Implement this method in a subclass such that it returns a serializable |
+ object for *o*, or calls the base implementation (to raise a |
+ :exc:`TypeError`). |
+ |
+ For example, to support arbitrary iterators, you could implement default |
+ like this:: |
+ |
+ def default(self, o): |
+ try: |
+ iterable = iter(o) |
+ except TypeError: |
+ pass |
+ else: |
+ return list(iterable) |
+ return JSONEncoder.default(self, o) |
+ |
+ |
+ .. method:: encode(o) |
+ |
+ Return a JSON string representation of a Python data structure, *o*. For |
+ example:: |
+ |
+ >>> import simplejson as json |
+ >>> json.JSONEncoder().encode({"foo": ["bar", "baz"]}) |
+ '{"foo": ["bar", "baz"]}' |
+ |
+ |
+ .. method:: iterencode(o) |
+ |
+ Encode the given object, *o*, and yield each string representation as |
+ available. For example:: |
+ |
+ for chunk in JSONEncoder().iterencode(bigobject): |
+ mysocket.write(chunk) |
+ |
+ Note that :meth:`encode` has much better performance than |
+ :meth:`iterencode`. |