author | Sverre Rabbelier <srabbelier@gmail.com> |
Wed, 22 Oct 2008 06:19:12 +0000 | |
changeset 403 | d3e545a8bd26 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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r""" |
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A simple, fast, extensible JSON encoder and decoder |
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JSON (JavaScript Object Notation) <http://json.org> is a subset of |
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JavaScript syntax (ECMA-262 3rd edition) used as a lightweight data |
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interchange format. |
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simplejson exposes an API familiar to uses of the standard library |
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marshal and pickle modules. |
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|
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Encoding basic Python object hierarchies:: |
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|
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>>> import simplejson |
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>>> simplejson.dumps(['foo', {'bar': ('baz', None, 1.0, 2)}]) |
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'["foo", {"bar": ["baz", null, 1.0, 2]}]' |
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>>> print simplejson.dumps("\"foo\bar") |
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"\"foo\bar" |
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>>> print simplejson.dumps(u'\u1234') |
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"\u1234" |
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>>> print simplejson.dumps('\\') |
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"\\" |
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>>> print simplejson.dumps({"c": 0, "b": 0, "a": 0}, sort_keys=True) |
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{"a": 0, "b": 0, "c": 0} |
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>>> from StringIO import StringIO |
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>>> io = StringIO() |
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>>> simplejson.dump(['streaming API'], io) |
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>>> io.getvalue() |
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'["streaming API"]' |
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Compact encoding:: |
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>>> import simplejson |
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>>> simplejson.dumps([1,2,3,{'4': 5, '6': 7}], separators=(',',':')) |
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'[1,2,3,{"4":5,"6":7}]' |
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Pretty printing:: |
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|
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>>> import simplejson |
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>>> print simplejson.dumps({'4': 5, '6': 7}, sort_keys=True, indent=4) |
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{ |
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"4": 5, |
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"6": 7 |
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} |
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Decoding JSON:: |
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>>> import simplejson |
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>>> simplejson.loads('["foo", {"bar":["baz", null, 1.0, 2]}]') |
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[u'foo', {u'bar': [u'baz', None, 1.0, 2]}] |
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>>> simplejson.loads('"\\"foo\\bar"') |
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u'"foo\x08ar' |
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>>> from StringIO import StringIO |
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>>> io = StringIO('["streaming API"]') |
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>>> simplejson.load(io) |
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[u'streaming API'] |
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Specializing JSON object decoding:: |
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|
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>>> import simplejson |
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>>> def as_complex(dct): |
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... if '__complex__' in dct: |
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... return complex(dct['real'], dct['imag']) |
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... return dct |
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... |
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>>> simplejson.loads('{"__complex__": true, "real": 1, "imag": 2}', |
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... object_hook=as_complex) |
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(1+2j) |
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>>> import decimal |
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>>> simplejson.loads('1.1', parse_float=decimal.Decimal) |
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Decimal("1.1") |
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Extending JSONEncoder:: |
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>>> import simplejson |
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>>> class ComplexEncoder(simplejson.JSONEncoder): |
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... def default(self, obj): |
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... if isinstance(obj, complex): |
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... return [obj.real, obj.imag] |
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... return simplejson.JSONEncoder.default(self, obj) |
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... |
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>>> dumps(2 + 1j, cls=ComplexEncoder) |
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'[2.0, 1.0]' |
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>>> ComplexEncoder().encode(2 + 1j) |
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'[2.0, 1.0]' |
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>>> list(ComplexEncoder().iterencode(2 + 1j)) |
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['[', '2.0', ', ', '1.0', ']'] |
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Using simplejson from the shell to validate and |
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pretty-print:: |
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$ echo '{"json":"obj"}' | python -msimplejson.tool |
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{ |
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"json": "obj" |
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} |
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$ echo '{ 1.2:3.4}' | python -msimplejson.tool |
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Expecting property name: line 1 column 2 (char 2) |
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Note that the JSON produced by this module's default settings |
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is a subset of YAML, so it may be used as a serializer for that as well. |
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""" |
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__version__ = '1.9.2' |
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__all__ = [ |
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'dump', 'dumps', 'load', 'loads', |
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'JSONDecoder', 'JSONEncoder', |
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] |
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if __name__ == '__main__': |
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import warnings |
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warnings.warn('python -msimplejson is deprecated, use python -msiplejson.tool', DeprecationWarning) |
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from django.utils.simplejson.decoder import JSONDecoder |
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from django.utils.simplejson.encoder import JSONEncoder |
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else: |
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from decoder import JSONDecoder |
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from encoder import JSONEncoder |
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_default_encoder = JSONEncoder( |
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skipkeys=False, |
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ensure_ascii=True, |
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check_circular=True, |
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allow_nan=True, |
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indent=None, |
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separators=None, |
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encoding='utf-8', |
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default=None, |
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) |
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def dump(obj, fp, skipkeys=False, ensure_ascii=True, check_circular=True, |
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allow_nan=True, cls=None, indent=None, separators=None, |
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encoding='utf-8', default=None, **kw): |
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""" |
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Serialize ``obj`` as a JSON formatted stream to ``fp`` (a |
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``.write()``-supporting file-like object). |
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134 |
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(``str``, ``unicode``, ``int``, ``long``, ``float``, ``bool``, ``None``) |
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will be skipped instead of raising a ``TypeError``. |
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138 |
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may be ``unicode`` instances, subject to normal Python ``str`` to |
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``unicode`` coercion rules. Unless ``fp.write()`` explicitly |
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understands ``unicode`` (as in ``codecs.getwriter()``) this is likely |
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143 |
to cause an error. |
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144 |
|
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for container types will be skipped and a circular reference will |
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result in an ``OverflowError`` (or worse). |
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148 |
|
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If ``allow_nan`` is ``False``, then it will be a ``ValueError`` to |
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serialize out of range ``float`` values (``nan``, ``inf``, ``-inf``) |
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in strict compliance of the JSON specification, instead of using the |
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JavaScript equivalents (``NaN``, ``Infinity``, ``-Infinity``). |
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153 |
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If ``indent`` is a non-negative integer, then JSON array elements and object |
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members will be pretty-printed with that indent level. An indent level |
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of 0 will only insert newlines. ``None`` is the most compact representation. |
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157 |
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If ``separators`` is an ``(item_separator, dict_separator)`` tuple |
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then it will be used instead of the default ``(', ', ': ')`` separators. |
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``(',', ':')`` is the most compact JSON representation. |
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161 |
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``encoding`` is the character encoding for str instances, default is UTF-8. |
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163 |
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``default(obj)`` is a function that should return a serializable version |
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of obj or raise TypeError. The default simply raises TypeError. |
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166 |
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To use a custom ``JSONEncoder`` subclass (e.g. one that overrides the |
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``.default()`` method to serialize additional types), specify it with |
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the ``cls`` kwarg. |
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""" |
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# cached encoder |
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if (skipkeys is False and ensure_ascii is True and |
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check_circular is True and allow_nan is True and |
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cls is None and indent is None and separators is None and |
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encoding == 'utf-8' and default is None and not kw): |
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iterable = _default_encoder.iterencode(obj) |
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177 |
else: |
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if cls is None: |
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cls = JSONEncoder |
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iterable = cls(skipkeys=skipkeys, ensure_ascii=ensure_ascii, |
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check_circular=check_circular, allow_nan=allow_nan, indent=indent, |
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separators=separators, encoding=encoding, |
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default=default, **kw).iterencode(obj) |
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# could accelerate with writelines in some versions of Python, at |
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# a debuggability cost |
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for chunk in iterable: |
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fp.write(chunk) |
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188 |
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189 |
|
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def dumps(obj, skipkeys=False, ensure_ascii=True, check_circular=True, |
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allow_nan=True, cls=None, indent=None, separators=None, |
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encoding='utf-8', default=None, **kw): |
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""" |
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Serialize ``obj`` to a JSON formatted ``str``. |
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195 |
|
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If ``skipkeys`` is ``True`` then ``dict`` keys that are not basic types |
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(``str``, ``unicode``, ``int``, ``long``, ``float``, ``bool``, ``None``) |
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will be skipped instead of raising a ``TypeError``. |
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199 |
|
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If ``ensure_ascii`` is ``False``, then the return value will be a |
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``unicode`` instance subject to normal Python ``str`` to ``unicode`` |
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coercion rules instead of being escaped to an ASCII ``str``. |
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203 |
|
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If ``check_circular`` is ``False``, then the circular reference check |
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for container types will be skipped and a circular reference will |
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result in an ``OverflowError`` (or worse). |
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207 |
|
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If ``allow_nan`` is ``False``, then it will be a ``ValueError`` to |
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serialize out of range ``float`` values (``nan``, ``inf``, ``-inf``) in |
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strict compliance of the JSON specification, instead of using the |
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JavaScript equivalents (``NaN``, ``Infinity``, ``-Infinity``). |
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212 |
|
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If ``indent`` is a non-negative integer, then JSON array elements and |
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object members will be pretty-printed with that indent level. An indent |
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level of 0 will only insert newlines. ``None`` is the most compact |
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representation. |
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217 |
|
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If ``separators`` is an ``(item_separator, dict_separator)`` tuple |
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then it will be used instead of the default ``(', ', ': ')`` separators. |
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``(',', ':')`` is the most compact JSON representation. |
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``encoding`` is the character encoding for str instances, default is UTF-8. |
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``default(obj)`` is a function that should return a serializable version |
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of obj or raise TypeError. The default simply raises TypeError. |
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To use a custom ``JSONEncoder`` subclass (e.g. one that overrides the |
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``.default()`` method to serialize additional types), specify it with |
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the ``cls`` kwarg. |
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""" |
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# cached encoder |
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if (skipkeys is False and ensure_ascii is True and |
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check_circular is True and allow_nan is True and |
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cls is None and indent is None and separators is None and |
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encoding == 'utf-8' and default is None and not kw): |
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return _default_encoder.encode(obj) |
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if cls is None: |
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cls = JSONEncoder |
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return cls( |
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skipkeys=skipkeys, ensure_ascii=ensure_ascii, |
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check_circular=check_circular, allow_nan=allow_nan, indent=indent, |
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separators=separators, encoding=encoding, default=default, |
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**kw).encode(obj) |
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_default_decoder = JSONDecoder(encoding=None, object_hook=None) |
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def load(fp, encoding=None, cls=None, object_hook=None, parse_float=None, |
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parse_int=None, parse_constant=None, **kw): |
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""" |
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Deserialize ``fp`` (a ``.read()``-supporting file-like object containing |
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a JSON document) to a Python object. |
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than utf-8 (e.g. latin-1), then an appropriate ``encoding`` name must |
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be specified. Encodings that are not ASCII based (such as UCS-2) are |
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not allowed, and should be wrapped with |
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``codecs.getreader(fp)(encoding)``, or simply decoded to a ``unicode`` |
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object and passed to ``loads()`` |
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``object_hook`` is an optional function that will be called with the |
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result of any object literal decode (a ``dict``). The return value of |
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``object_hook`` will be used instead of the ``dict``. This feature |
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can be used to implement custom decoders (e.g. JSON-RPC class hinting). |
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kwarg. |
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""" |
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return loads(fp.read(), |
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encoding=encoding, cls=cls, object_hook=object_hook, |
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parse_float=parse_float, parse_int=parse_int, |
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parse_constant=parse_constant, **kw) |
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def loads(s, encoding=None, cls=None, object_hook=None, parse_float=None, |
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parse_int=None, parse_constant=None, **kw): |
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""" |
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Deserialize ``s`` (a ``str`` or ``unicode`` instance containing a JSON |
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document) to a Python object. |
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If ``s`` is a ``str`` instance and is encoded with an ASCII based encoding |
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other than utf-8 (e.g. latin-1) then an appropriate ``encoding`` name |
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must be specified. Encodings that are not ASCII based (such as UCS-2) |
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are not allowed and should be decoded to ``unicode`` first. |
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``object_hook`` is an optional function that will be called with the |
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result of any object literal decode (a ``dict``). The return value of |
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``object_hook`` will be used instead of the ``dict``. This feature |
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can be used to implement custom decoders (e.g. JSON-RPC class hinting). |
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``parse_float``, if specified, will be called with the string |
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of every JSON float to be decoded. By default this is equivalent to |
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float(num_str). This can be used to use another datatype or parser |
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for JSON floats (e.g. decimal.Decimal). |
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``parse_int``, if specified, will be called with the string |
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of every JSON int to be decoded. By default this is equivalent to |
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int(num_str). This can be used to use another datatype or parser |
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for JSON integers (e.g. float). |
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``parse_constant``, if specified, will be called with one of the |
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following strings: -Infinity, Infinity, NaN, null, true, false. |
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This can be used to raise an exception if invalid JSON numbers |
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are encountered. |
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kwarg. |
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""" |
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if (cls is None and encoding is None and object_hook is None and |
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parse_int is None and parse_float is None and |
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parse_constant is None and not kw): |
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return _default_decoder.decode(s) |
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if cls is None: |
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cls = JSONDecoder |
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if object_hook is not None: |
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kw['object_hook'] = object_hook |
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if parse_float is not None: |
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kw['parse_float'] = parse_float |
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if parse_int is not None: |
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kw['parse_int'] = parse_int |
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if parse_constant is not None: |
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kw['parse_constant'] = parse_constant |
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return cls(encoding=encoding, **kw).decode(s) |
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# |
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328 |
# Compatibility cruft from other libraries |
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329 |
# |
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330 |
|
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331 |
|
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332 |
def decode(s): |
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333 |
""" |
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334 |
demjson, python-cjson API compatibility hook. Use loads(s) instead. |
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335 |
""" |
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336 |
import warnings |
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337 |
warnings.warn("simplejson.loads(s) should be used instead of decode(s)", |
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338 |
DeprecationWarning) |
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339 |
return loads(s) |
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340 |
|
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341 |
|
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342 |
def encode(obj): |
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343 |
""" |
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344 |
demjson, python-cjson compatibility hook. Use dumps(s) instead. |
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345 |
""" |
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346 |
import warnings |
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347 |
warnings.warn("simplejson.dumps(s) should be used instead of encode(s)", |
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348 |
DeprecationWarning) |
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349 |
return dumps(obj) |
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350 |
|
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351 |
|
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352 |
def read(s): |
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353 |
""" |
323
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354 |
jsonlib, JsonUtils, python-json, json-py API compatibility hook. |
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355 |
Use loads(s) instead. |
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356 |
""" |
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357 |
import warnings |
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358 |
warnings.warn("simplejson.loads(s) should be used instead of read(s)", |
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359 |
DeprecationWarning) |
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|
360 |
return loads(s) |
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361 |
|
323
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362 |
|
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363 |
def write(obj): |
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364 |
""" |
323
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365 |
jsonlib, JsonUtils, python-json, json-py API compatibility hook. |
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366 |
Use dumps(s) instead. |
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367 |
""" |
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368 |
import warnings |
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369 |
warnings.warn("simplejson.dumps(s) should be used instead of write(s)", |
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370 |
DeprecationWarning) |
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|
371 |
return dumps(obj) |
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|
372 |
|
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373 |
|
323
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374 |
if __name__ == '__main__': |
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375 |
import simplejson.tool |
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376 |
simplejson.tool.main() |