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30 accesskey="I">index</a></li>
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38
39
40 <div class="section" id="module-simplejson">
41 <h1 id="module-simplejson"><tt class="xref docutils literal"><span class="pre">s implejson</span></tt> &#8212; JSON encoder and decoder<a class="headerlink" href ="#module-simplejson" title="Permalink to this headline">¶</a></h1>
42 <p>JSON (JavaScript Object Notation) &lt;<a class="reference external" href="htt p://json.org">http://json.org</a>&gt; is a subset of JavaScript
43 syntax (ECMA-262 3rd edition) used as a lightweight data interchange format.</p>
44 <p><tt class="xref docutils literal"><span class="pre">simplejson</span></tt> ex poses an API familiar to users of the standard library
45 <tt class="xref docutils literal"><span class="pre">marshal</span></tt> and <tt class="xref docutils literal"><span class="pre">pickle</span></tt> modules. It i s the externally maintained
46 version of the <tt class="xref docutils literal"><span class="pre">json</span></ tt> library contained in Python 2.6, but maintains
47 compatibility with Python 2.4 and Python 2.5 and (currently) has
48 significant performance advantages, even without using the optional C
49 extension for speedups.</p>
50 <p>Encoding basic Python object hierarchies:</p>
51 <div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k" >import</span> <span class="nn">simplejson</span> <span class="k">as</span> <spa n class="nn">json</span>
52 <span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o"> .</span><span class="n">dumps</span><span class="p">([</span><span class="s">&#3 9;foo&#39;</span><span class="p">,</span> <span class="p">{</span><span class="s ">&#39;bar&#39;</span><span class="p">:</span> <span class="p">(</span><span cla ss="s">&#39;baz&#39;</span><span class="p">,</span> <span class="bp">None</span> <span class="p">,</span> <span class="mf">1.0</span><span class="p">,</span> <sp an class="mf">2</span><span class="p">)}])</span>
53 <span class="go">&#39;[&quot;foo&quot;, {&quot;bar&quot;: [&quot;baz&quot;, null , 1.0, 2]}]&#39;</span>
54 <span class="gp">&gt;&gt;&gt; </span><span class="k">print</span> <span class="n ">json</span><span class="o">.</span><span class="n">dumps</span><span class="p" >(</span><span class="s">&quot;</span><span class="se">\&quot;</span><span class ="s">foo</span><span class="se">\b</span><span class="s">ar&quot;</span><span cl ass="p">)</span>
55 <span class="go">&quot;\&quot;foo\bar&quot;</span>
56 <span class="gp">&gt;&gt;&gt; </span><span class="k">print</span> <span class="n ">json</span><span class="o">.</span><span class="n">dumps</span><span class="p" >(</span><span class="s">u&#39;</span><span class="se">\u1234</span><span class= "s">&#39;</span><span class="p">)</span>
57 <span class="go">&quot;\u1234&quot;</span>
58 <span class="gp">&gt;&gt;&gt; </span><span class="k">print</span> <span class="n ">json</span><span class="o">.</span><span class="n">dumps</span><span class="p" >(</span><span class="s">&#39;</span><span class="se">\\</span><span class="s">& #39;</span><span class="p">)</span>
59 <span class="go">&quot;\\&quot;</span>
60 <span class="gp">&gt;&gt;&gt; </span><span class="k">print</span> <span class="n ">json</span><span class="o">.</span><span class="n">dumps</span><span class="p" >({</span><span class="s">&quot;c&quot;</span><span class="p">:</span> <span cla ss="mf">0</span><span class="p">,</span> <span class="s">&quot;b&quot;</span><sp an class="p">:</span> <span class="mf">0</span><span class="p">,</span> <span cl ass="s">&quot;a&quot;</span><span class="p">:</span> <span class="mf">0</span><s pan class="p">},</span> <span class="n">sort_keys</span><span class="o">=</span> <span class="bp">True</span><span class="p">)</span>
61 <span class="go">{&quot;a&quot;: 0, &quot;b&quot;: 0, &quot;c&quot;: 0}</span>
62 <span class="gp">&gt;&gt;&gt; </span><span class="k">from</span> <span class="nn ">StringIO</span> <span class="k">import</span> <span class="n">StringIO</span>
63 <span class="gp">&gt;&gt;&gt; </span><span class="n">io</span> <span class="o">= </span> <span class="n">StringIO</span><span class="p">()</span>
64 <span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o"> .</span><span class="n">dump</span><span class="p">([</span><span class="s">&#39 ;streaming API&#39;</span><span class="p">],</span> <span class="n">io</span><sp an class="p">)</span>
65 <span class="gp">&gt;&gt;&gt; </span><span class="n">io</span><span class="o">.< /span><span class="n">getvalue</span><span class="p">()</span>
66 <span class="go">&#39;[&quot;streaming API&quot;]&#39;</span>
67 </pre></div>
68 <p>Compact encoding:</p>
69 <div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k" >import</span> <span class="nn">simplejson</span> <span class="k">as</span> <spa n class="nn">json</span>
70 <span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o"> .</span><span class="n">dumps</span><span class="p">([</span><span class="mf">1< /span><span class="p">,</span><span class="mf">2</span><span class="p">,</span>< span class="mf">3</span><span class="p">,{</span><span class="s">&#39;4&#39;</sp an><span class="p">:</span> <span class="mf">5</span><span class="p">,</span> <s pan class="s">&#39;6&#39;</span><span class="p">:</span> <span class="mf">7</spa n><span class="p">}],</span> <span class="n">separators</span><span class="o">=< /span><span class="p">(</span><span class="s">&#39;,&#39;</span><span class="p"> ,</span><span class="s">&#39;:&#39;</span><span class="p">))</span>
71 <span class="go">&#39;[1,2,3,{&quot;4&quot;:5,&quot;6&quot;:7}]&#39;</span>
72 </pre></div>
73 <p>Pretty printing:</p>
74 <div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k" >import</span> <span class="nn">simplejson</span> <span class="k">as</span> <spa n class="nn">json</span>
75 <span class="gp">&gt;&gt;&gt; </span><span class="n">s</span> <span class="o">=< /span> <span class="n">json</span><span class="o">.</span><span class="n">dumps< /span><span class="p">({</span><span class="s">&#39;4&#39;</span><span class="p" >:</span> <span class="mf">5</span><span class="p">,</span> <span class="s">&#39 ;6&#39;</span><span class="p">:</span> <span class="mf">7</span><span class="p"> },</span> <span class="n">sort_keys</span><span class="o">=</span><span class="b p">True</span><span class="p">,</span> <span class="n">indent</span><span class= "o">=</span><span class="mf">4</span><span class="p">)</span>
76 <span class="gp">&gt;&gt;&gt; </span><span class="k">print</span> <span class="s ">&#39;</span><span class="se">\n</span><span class="s">&#39;</span><span class= "o">.</span><span class="n">join</span><span class="p">([</span><span class="n"> l</span><span class="o">.</span><span class="n">rstrip</span><span class="p">()< /span> <span class="k">for</span> <span class="n">l</span> <span class="ow">in</ span> <span class="n">s</span><span class="o">.</span><span class="n">splitline s</span><span class="p">()])</span>
77 <span class="go">{</span>
78 <span class="go"> &quot;4&quot;: 5,</span>
79 <span class="go"> &quot;6&quot;: 7</span>
80 <span class="go">}</span>
81 </pre></div>
82 <p>Decoding JSON:</p>
83 <div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k" >import</span> <span class="nn">simplejson</span> <span class="k">as</span> <spa n class="nn">json</span>
84 <span class="gp">&gt;&gt;&gt; </span><span class="n">obj</span> <span class="o"> =</span> <span class="p">[</span><span class="s">u&#39;foo&#39;</span><span clas s="p">,</span> <span class="p">{</span><span class="s">u&#39;bar&#39;</span><spa n class="p">:</span> <span class="p">[</span><span class="s">u&#39;baz&#39;</spa n><span class="p">,</span> <span class="bp">None</span><span class="p">,</span> <span class="mf">1.0</span><span class="p">,</span> <span class="mf">2</span><sp an class="p">]}]</span>
85 <span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o"> .</span><span class="n">loads</span><span class="p">(</span><span class="s">&#39 ;[&quot;foo&quot;, {&quot;bar&quot;:[&quot;baz&quot;, null, 1.0, 2]}]&#39;</span ><span class="p">)</span> <span class="o">==</span> <span class="n">obj</span>
86 <span class="go">True</span>
87 <span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o"> .</span><span class="n">loads</span><span class="p">(</span><span class="s">&#39 ;&quot;</span><span class="se">\\</span><span class="s">&quot;foo</span><span cl ass="se">\\</span><span class="s">bar&quot;&#39;</span><span class="p">)</span> <span class="o">==</span> <span class="s">u&#39;&quot;foo</span><span class="se" >\x08</span><span class="s">ar&#39;</span>
88 <span class="go">True</span>
89 <span class="gp">&gt;&gt;&gt; </span><span class="k">from</span> <span class="nn ">StringIO</span> <span class="k">import</span> <span class="n">StringIO</span>
90 <span class="gp">&gt;&gt;&gt; </span><span class="n">io</span> <span class="o">= </span> <span class="n">StringIO</span><span class="p">(</span><span class="s">& #39;[&quot;streaming API&quot;]&#39;</span><span class="p">)</span>
91 <span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o"> .</span><span class="n">load</span><span class="p">(</span><span class="n">io</s pan><span class="p">)[</span><span class="mf">0</span><span class="p">]</span> < span class="o">==</span> <span class="s">&#39;streaming API&#39;</span>
92 <span class="go">True</span>
93 </pre></div>
94 <p>Specializing JSON object decoding:</p>
95 <div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k" >import</span> <span class="nn">simplejson</span> <span class="k">as</span> <spa n class="nn">json</span>
96 <span class="gp">&gt;&gt;&gt; </span><span class="k">def</span> <span class="nf" >as_complex</span><span class="p">(</span><span class="n">dct</span><span class= "p">):</span>
97 <span class="gp">... </span> <span class="k">if</span> <span class="s">&#39;_ _complex__&#39;</span> <span class="ow">in</span> <span class="n">dct</span><spa n class="p">:</span>
98 <span class="gp">... </span> <span class="k">return</span> <span class="n b">complex</span><span class="p">(</span><span class="n">dct</span><span class=" p">[</span><span class="s">&#39;real&#39;</span><span class="p">],</span> <span class="n">dct</span><span class="p">[</span><span class="s">&#39;imag&#39;</span ><span class="p">])</span>
99 <span class="gp">... </span> <span class="k">return</span> <span class="n">dc t</span>
100 <span class="gp">...</span>
101 <span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o"> .</span><span class="n">loads</span><span class="p">(</span><span class="s">&#39 ;{&quot;__complex__&quot;: true, &quot;real&quot;: 1, &quot;imag&quot;: 2}&#39;< /span><span class="p">,</span>
102 <span class="gp">... </span> <span class="n">object_hook</span><span class="o ">=</span><span class="n">as_complex</span><span class="p">)</span>
103 <span class="go">(1+2j)</span>
104 <span class="gp">&gt;&gt;&gt; </span><span class="k">import</span> <span class=" nn">decimal</span>
105 <span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o"> .</span><span class="n">loads</span><span class="p">(</span><span class="s">&#39 ;1.1&#39;</span><span class="p">,</span> <span class="n">parse_float</span><span class="o">=</span><span class="n">decimal</span><span class="o">.</span><span c lass="n">Decimal</span><span class="p">)</span> <span class="o">==</span> <span class="n">decimal</span><span class="o">.</span><span class="n">Decimal</span><s pan class="p">(</span><span class="s">&#39;1.1&#39;</span><span class="p">)</spa n>
106 <span class="go">True</span>
107 </pre></div>
108 <p>Specializing JSON object encoding:</p>
109 <div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k" >import</span> <span class="nn">simplejson</span> <span class="k">as</span> <spa n class="nn">json</span>
110 <span class="gp">&gt;&gt;&gt; </span><span class="k">def</span> <span class="nf" >encode_complex</span><span class="p">(</span><span class="n">obj</span><span cl ass="p">):</span>
111 <span class="gp">... </span> <span class="k">if</span> <span class="nb">isins tance</span><span class="p">(</span><span class="n">obj</span><span class="p">,< /span> <span class="nb">complex</span><span class="p">):</span>
112 <span class="gp">... </span> <span class="k">return</span> <span class="p ">[</span><span class="n">obj</span><span class="o">.</span><span class="n">real </span><span class="p">,</span> <span class="n">obj</span><span class="o">.</spa n><span class="n">imag</span><span class="p">]</span>
113 <span class="gp">... </span> <span class="k">raise</span> <span class="ne">Ty peError</span><span class="p">(</span><span class="nb">repr</span><span class="p ">(</span><span class="n">o</span><span class="p">)</span> <span class="o">+</sp an> <span class="s">&quot; is not JSON serializable&quot;</span><span class="p"> )</span>
114 <span class="gp">...</span>
115 <span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o"> .</span><span class="n">dumps</span><span class="p">(</span><span class="mf">2</ span> <span class="o">+</span> <span class="mf">1</span><span class="n">j</span> <span class="p">,</span> <span class="n">default</span><span class="o">=</span>< span class="n">encode_complex</span><span class="p">)</span>
116 <span class="go">&#39;[2.0, 1.0]&#39;</span>
117 <span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o"> .</span><span class="n">JSONEncoder</span><span class="p">(</span><span class="n ">default</span><span class="o">=</span><span class="n">encode_complex</span><sp an class="p">)</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="mf">2</span> <span class="o">+</span> <span class ="mf">1</span><span class="n">j</span><span class="p">)</span>
118 <span class="go">&#39;[2.0, 1.0]&#39;</span>
119 <span class="gp">&gt;&gt;&gt; </span><span class="s">&#39;&#39;</span><span clas s="o">.</span><span class="n">join</span><span class="p">(</span><span class="n" >json</span><span class="o">.</span><span class="n">JSONEncoder</span><span clas s="p">(</span><span class="n">default</span><span class="o">=</span><span class= "n">encode_complex</span><span class="p">)</span><span class="o">.</span><span c lass="n">iterencode</span><span class="p">(</span><span class="mf">2</span> <spa n class="o">+</span> <span class="mf">1</span><span class="n">j</span><span clas s="p">))</span>
120 <span class="go">&#39;[2.0, 1.0]&#39;</span>
121 </pre></div>
122 <p>Using <tt class="xref docutils literal"><span class="pre">simplejson.tool</sp an></tt> from the shell to validate and pretty-print:</p>
123 <div class="highlight"><pre>$ echo &#39;{&quot;json&quot;:&quot;obj&quot;}&#39; | python -m simplejson.tool
124 {
125 &quot;json&quot;: &quot;obj&quot;
126 }
127 $ echo &#39;{ 1.2:3.4}&#39; | python -m simplejson.tool
128 Expecting property name: line 1 column 2 (char 2)
129 </pre></div>
130 <div class="admonition note">
131 <p class="first admonition-title">Note</p>
132 <p class="last">The JSON produced by this module&#8217;s default settings is a s ubset of
133 YAML, so it may be used as a serializer for that as well.</p>
134 </div>
135 <div class="section" id="basic-usage">
136 <h2 id="basic-usage">Basic Usage<a class="headerlink" href="#basic-usage" title= "Permalink to this headline">¶</a></h2>
137 <dl class="function">
138 <dt id="simplejson.dump">
139 <!--[simplejson.dump]--><tt class="descclassname">simplejson.</tt><tt class="des cname">dump</tt><big>(</big><em>obj</em>, <em>fp</em><span class="optional">[</s pan>, <em>skipkeys</em><span class="optional">[</span>, <em>ensure_ascii</em><sp an class="optional">[</span>, <em>check_circular</em><span class="optional">[</s pan>, <em>allow_nan</em><span class="optional">[</span>, <em>cls</em><span class ="optional">[</span>, <em>indent</em><span class="optional">[</span>, <em>separa tors</em><span class="optional">[</span>, <em>encoding</em><span class="optional ">[</span>, <em>default</em><span class="optional">[</span>, <em>**kw</em><span class="optional">]</span><span class="optional">]</span><span class="optional">] </span><span class="optional">]</span><span class="optional">]</span><span class ="optional">]</span><span class="optional">]</span><span class="optional">]</spa n><span class="optional">]</span><span class="optional">]</span><big>)</big><a c lass="headerlink" href="#simplejson.dump" title="Permalink to this definition">¶ </a></dt>
140 <dd><p>Serialize <em>obj</em> as a JSON formatted stream to <em>fp</em> (a <tt c lass="docutils literal"><span class="pre">.write()</span></tt>-supporting
141 file-like object).</p>
142 <p>If <em>skipkeys</em> is true (default: <tt class="xref docutils literal"><spa n class="pre">False</span></tt>), then dict keys that are not
143 of a basic type (<tt class="xref docutils literal"><span class="pre">str</span>< /tt>, <tt class="xref docutils literal"><span class="pre">unicode</span></tt>, < tt class="xref docutils literal"><span class="pre">int</span></tt>, <tt class="x ref docutils literal"><span class="pre">long</span></tt>,
144 <tt class="xref docutils literal"><span class="pre">float</span></tt>, <tt class ="xref docutils literal"><span class="pre">bool</span></tt>, <tt class="xref doc utils literal"><span class="pre">None</span></tt>) will be skipped instead of ra ising a
145 <tt class="xref docutils literal"><span class="pre">TypeError</span></tt>.</p>
146 <p>If <em>ensure_ascii</em> is false (default: <tt class="xref docutils literal" ><span class="pre">True</span></tt>), then some chunks written
147 to <em>fp</em> may be <tt class="xref docutils literal"><span class="pre">unicod e</span></tt> instances, subject to normal Python
148 <tt class="xref docutils literal"><span class="pre">str</span></tt> to <tt class ="xref docutils literal"><span class="pre">unicode</span></tt> coercion rules. Unless <tt class="docutils literal"><span class="pre">fp.write()</span></tt>
149 explicitly understands <tt class="xref docutils literal"><span class="pre">unico de</span></tt> (as in <tt class="xref docutils literal"><span class="pre">codecs .getwriter()</span></tt>) this
150 is likely to cause an error. It&#8217;s best to leave the default settings, beca use
151 they are safe and it is highly optimized.</p>
152 <p>If <em>check_circular</em> is false (default: <tt class="xref docutils litera l"><span class="pre">True</span></tt>), then the circular
153 reference check for container types will be skipped and a circular reference
154 will result in an <tt class="xref docutils literal"><span class="pre">OverflowEr ror</span></tt> (or worse).</p>
155 <p>If <em>allow_nan</em> is false (default: <tt class="xref docutils literal"><s pan class="pre">True</span></tt>), then it will be a
156 <tt class="xref docutils literal"><span class="pre">ValueError</span></tt> to se rialize out of range <tt class="xref docutils literal"><span class="pre">float</ span></tt> values (<tt class="docutils literal"><span class="pre">nan</span></tt >,
157 <tt class="docutils literal"><span class="pre">inf</span></tt>, <tt class="docut ils literal"><span class="pre">-inf</span></tt>) in strict compliance of the JSO N specification.
158 If <em>allow_nan</em> is true, their JavaScript equivalents will be used
159 (<tt class="docutils literal"><span class="pre">NaN</span></tt>, <tt class="docu tils literal"><span class="pre">Infinity</span></tt>, <tt class="docutils litera l"><span class="pre">-Infinity</span></tt>).</p>
160 <p>If <em>indent</em> is a non-negative integer, then JSON array elements and ob ject
161 members will be pretty-printed with that indent level. An indent level of 0
162 will only insert newlines. <tt class="xref docutils literal"><span class="pre"> None</span></tt> (the default) selects the most compact
163 representation.</p>
164 <p>If specified, <em>separators</em> should be an <tt class="docutils literal">< span class="pre">(item_separator,</span> <span class="pre">dict_separator)</span ></tt>
165 tuple. By default, <tt class="docutils literal"><span class="pre">(',</span> <s pan class="pre">',</span> <span class="pre">':</span> <span class="pre">')</span ></tt> are used. To get the most compact JSON
166 representation, you should specify <tt class="docutils literal"><span class="pre ">(',',</span> <span class="pre">':')</span></tt> to eliminate whitespace.</p>
167 <p><em>encoding</em> is the character encoding for str instances, default is
168 <tt class="docutils literal"><span class="pre">'utf-8'</span></tt>.</p>
169 <p>If specified, <em>default</em> should be a function that gets called for obje cts
170 that can&#8217;t otherwise be serialized. It should return a JSON encodable
171 version of the object or raise a <tt class="xref docutils literal"><span class=" pre">TypeError</span></tt>. If not specified,
172 <tt class="xref docutils literal"><span class="pre">TypeError</span></tt> is alw ays raised in those cases.</p>
173 <p>To use a custom <a title="simplejson.JSONEncoder" class="reference internal" href="#simplejson.JSONEncoder"><tt class="xref docutils literal"><span class="pr e">JSONEncoder</span></tt></a> subclass (e.g. one that overrides the
174 <tt class="xref docutils literal"><span class="pre">default()</span></tt> method to serialize additional types), specify it with the
175 <em>cls</em> kwarg.</p>
176 <blockquote>
177 <div class="admonition note">
178 <p class="first admonition-title">Note</p>
179 <p class="last">JSON is not a framed protocol so unlike <tt class="xref docutils literal"><span class="pre">pickle</span></tt> or <tt class="xref docutils liter al"><span class="pre">marshal</span></tt> it
180 does not make sense to serialize more than one JSON document without some
181 container protocol to delimit them.</p>
182 </div>
183 </blockquote>
184 </dd></dl>
185
186 <dl class="function">
187 <dt id="simplejson.dumps">
188 <!--[simplejson.dumps]--><tt class="descclassname">simplejson.</tt><tt class="de scname">dumps</tt><big>(</big><em>obj</em><span class="optional">[</span>, <em>s kipkeys</em><span class="optional">[</span>, <em>ensure_ascii</em><span class="o ptional">[</span>, <em>check_circular</em><span class="optional">[</span>, <em>a llow_nan</em><span class="optional">[</span>, <em>cls</em><span class="optional" >[</span>, <em>indent</em><span class="optional">[</span>, <em>separators</em><s pan class="optional">[</span>, <em>encoding</em><span class="optional">[</span>, <em>default</em><span class="optional">[</span>, <em>**kw</em><span class="opti onal">]</span><span class="optional">]</span><span class="optional">]</span><spa n class="optional">]</span><span class="optional">]</span><span class="optional" >]</span><span class="optional">]</span><span class="optional">]</span><span cla ss="optional">]</span><span class="optional">]</span><big>)</big><a class="heade rlink" href="#simplejson.dumps" title="Permalink to this definition">¶</a></dt>
189 <dd><p>Serialize <em>obj</em> to a JSON formatted <tt class="xref docutils liter al"><span class="pre">str</span></tt>.</p>
190 <p>If <em>ensure_ascii</em> is false, then the return value will be a
191 <tt class="xref docutils literal"><span class="pre">unicode</span></tt> instance . The other arguments have the same meaning as in
192 <a title="simplejson.dump" class="reference internal" href="#simplejson.dump"><t t class="xref docutils literal"><span class="pre">dump()</span></tt></a>. Note t hat the default <em>ensure_ascii</em> setting has much
193 better performance.</p>
194 </dd></dl>
195
196 <dl class="function">
197 <dt id="simplejson.load">
198 <!--[simplejson.load]--><tt class="descclassname">simplejson.</tt><tt class="des cname">load</tt><big>(</big><em>fp</em><span class="optional">[</span>, <em>enco ding</em><span class="optional">[</span>, <em>cls</em><span class="optional">[</ span>, <em>object_hook</em><span class="optional">[</span>, <em>parse_float</em> <span class="optional">[</span>, <em>parse_int</em><span class="optional">[</spa n>, <em>parse_constant</em><span class="optional">[</span>, <em>**kw</em><span c lass="optional">]</span><span class="optional">]</span><span class="optional">]< /span><span class="optional">]</span><span class="optional">]</span><span class= "optional">]</span><span class="optional">]</span><big>)</big><a class="headerli nk" href="#simplejson.load" title="Permalink to this definition">¶</a></dt>
199 <dd><p>Deserialize <em>fp</em> (a <tt class="docutils literal"><span class="pre" >.read()</span></tt>-supporting file-like object containing a JSON
200 document) to a Python object.</p>
201 <p>If the contents of <em>fp</em> are encoded with an ASCII based encoding other than
202 UTF-8 (e.g. latin-1), then an appropriate <em>encoding</em> name must be specifi ed.
203 Encodings that are not ASCII based (such as UCS-2) are not allowed, and
204 should be wrapped with <tt class="docutils literal"><span class="pre">codecs.get reader(fp)(encoding)</span></tt>, or simply decoded
205 to a <tt class="xref docutils literal"><span class="pre">unicode</span></tt> obj ect and passed to <a title="simplejson.loads" class="reference internal" href="# simplejson.loads"><tt class="xref docutils literal"><span class="pre">loads()</s pan></tt></a>. The default
206 setting of <tt class="docutils literal"><span class="pre">'utf-8'</span></tt> is fastest and should be using whenever possible.</p>
207 <p><em>object_hook</em> is an optional function that will be called with the res ult of
208 any object literal decode (a <tt class="xref docutils literal"><span class="pre" >dict</span></tt>). The return value of
209 <em>object_hook</em> will be used instead of the <tt class="xref docutils litera l"><span class="pre">dict</span></tt>. This feature can be used
210 to implement custom decoders (e.g. JSON-RPC class hinting).</p>
211 <p><em>parse_float</em>, if specified, will be called with the string of every J SON
212 float to be decoded. By default, this is equivalent to <tt class="docutils lite ral"><span class="pre">float(num_str)</span></tt>.
213 This can be used to use another datatype or parser for JSON floats
214 (e.g. <tt class="xref docutils literal"><span class="pre">decimal.Decimal</span> </tt>).</p>
215 <p><em>parse_int</em>, if specified, will be called with the string of every JSO N int
216 to be decoded. By default, this is equivalent to <tt class="docutils literal">< span class="pre">int(num_str)</span></tt>. This can
217 be used to use another datatype or parser for JSON integers
218 (e.g. <tt class="xref docutils literal"><span class="pre">float</span></tt>).</p >
219 <p><em>parse_constant</em>, if specified, will be called with one of the followi ng
220 strings: <tt class="docutils literal"><span class="pre">'-Infinity'</span></tt>, <tt class="docutils literal"><span class="pre">'Infinity'</span></tt>, <tt clas s="docutils literal"><span class="pre">'NaN'</span></tt>. This can be used to
221 raise an exception if invalid JSON numbers are encountered.</p>
222 <p>To use a custom <a title="simplejson.JSONDecoder" class="reference internal" href="#simplejson.JSONDecoder"><tt class="xref docutils literal"><span class="pr e">JSONDecoder</span></tt></a> subclass, specify it with the <tt class="docutils literal"><span class="pre">cls</span></tt>
223 kwarg. Additional keyword arguments will be passed to the constructor of the
224 class.</p>
225 <blockquote>
226 <div class="admonition note">
227 <p class="first admonition-title">Note</p>
228 <p class="last"><a title="simplejson.load" class="reference internal" href="#sim plejson.load"><tt class="xref docutils literal"><span class="pre">load()</span>< /tt></a> will read the rest of the file-like object as a string and
229 then call <a title="simplejson.loads" class="reference internal" href="#simplejs on.loads"><tt class="xref docutils literal"><span class="pre">loads()</span></tt ></a>. It does not stop at the end of the first valid
230 JSON document it finds and it will raise an error if there is anything
231 other than whitespace after the document. Except for files containing
232 only one JSON document, it is recommended to use <a title="simplejson.loads" cla ss="reference internal" href="#simplejson.loads"><tt class="xref docutils litera l"><span class="pre">loads()</span></tt></a>.</p>
233 </div>
234 </blockquote>
235 </dd></dl>
236
237 <dl class="function">
238 <dt id="simplejson.loads">
239 <!--[simplejson.loads]--><tt class="descclassname">simplejson.</tt><tt class="de scname">loads</tt><big>(</big><em>s</em><span class="optional">[</span>, <em>enc oding</em><span class="optional">[</span>, <em>cls</em><span class="optional">[< /span>, <em>object_hook</em><span class="optional">[</span>, <em>parse_float</em ><span class="optional">[</span>, <em>parse_int</em><span class="optional">[</sp an>, <em>parse_constant</em><span class="optional">[</span>, <em>**kw</em><span class="optional">]</span><span class="optional">]</span><span class="optional">] </span><span class="optional">]</span><span class="optional">]</span><span class ="optional">]</span><span class="optional">]</span><big>)</big><a class="headerl ink" href="#simplejson.loads" title="Permalink to this definition">¶</a></dt>
240 <dd><p>Deserialize <em>s</em> (a <tt class="xref docutils literal"><span class=" pre">str</span></tt> or <tt class="xref docutils literal"><span class="pre">unic ode</span></tt> instance containing a JSON
241 document) to a Python object.</p>
242 <p>If <em>s</em> is a <tt class="xref docutils literal"><span class="pre">str</s pan></tt> instance and is encoded with an ASCII based encoding
243 other than UTF-8 (e.g. latin-1), then an appropriate <em>encoding</em> name must be
244 specified. Encodings that are not ASCII based (such as UCS-2) are not
245 allowed and should be decoded to <tt class="xref docutils literal"><span class=" pre">unicode</span></tt> first.</p>
246 <p>The other arguments have the same meaning as in <a title="simplejson.load" cl ass="reference internal" href="#simplejson.load"><tt class="xref docutils litera l"><span class="pre">load()</span></tt></a>.</p>
247 </dd></dl>
248
249 </div>
250 <div class="section" id="encoders-and-decoders">
251 <h2 id="encoders-and-decoders">Encoders and decoders<a class="headerlink" href=" #encoders-and-decoders" title="Permalink to this headline">¶</a></h2>
252 <dl class="class">
253 <dt id="simplejson.JSONDecoder">
254 <!--[simplejson.JSONDecoder]-->class <tt class="descclassname">simplejson.</tt>< tt class="descname">JSONDecoder</tt><big>(</big><span class="optional">[</span>< em>encoding</em><span class="optional">[</span>, <em>object_hook</em><span class ="optional">[</span>, <em>parse_float</em><span class="optional">[</span>, <em>p arse_int</em><span class="optional">[</span>, <em>parse_constant</em><span class ="optional">[</span>, <em>strict</em><span class="optional">]</span><span class= "optional">]</span><span class="optional">]</span><span class="optional">]</span ><span class="optional">]</span><span class="optional">]</span><big>)</big><a cl ass="headerlink" href="#simplejson.JSONDecoder" title="Permalink to this definit ion">¶</a></dt>
255 <dd><p>Simple JSON decoder.</p>
256 <p>Performs the following translations in decoding by default:</p>
257 <table border="1" class="docutils">
258 <colgroup>
259 <col width="44%" />
260 <col width="56%" />
261 </colgroup>
262 <thead valign="bottom">
263 <tr><th class="head">JSON</th>
264 <th class="head">Python</th>
265 </tr>
266 </thead>
267 <tbody valign="top">
268 <tr><td>object</td>
269 <td>dict</td>
270 </tr>
271 <tr><td>array</td>
272 <td>list</td>
273 </tr>
274 <tr><td>string</td>
275 <td>unicode</td>
276 </tr>
277 <tr><td>number (int)</td>
278 <td>int, long</td>
279 </tr>
280 <tr><td>number (real)</td>
281 <td>float</td>
282 </tr>
283 <tr><td>true</td>
284 <td>True</td>
285 </tr>
286 <tr><td>false</td>
287 <td>False</td>
288 </tr>
289 <tr><td>null</td>
290 <td>None</td>
291 </tr>
292 </tbody>
293 </table>
294 <p>It also understands <tt class="docutils literal"><span class="pre">NaN</span> </tt>, <tt class="docutils literal"><span class="pre">Infinity</span></tt>, and <tt class="docutils literal"><span class="pre">-Infinity</span></tt> as their
295 corresponding <tt class="docutils literal"><span class="pre">float</span></tt> v alues, which is outside the JSON spec.</p>
296 <p><em>encoding</em> determines the encoding used to interpret any <tt class="xr ef docutils literal"><span class="pre">str</span></tt> objects
297 decoded by this instance (<tt class="docutils literal"><span class="pre">'utf-8' </span></tt> by default). It has no effect when decoding
298 <tt class="xref docutils literal"><span class="pre">unicode</span></tt> objects. </p>
299 <p>Note that currently only encodings that are a superset of ASCII work, strings
300 of other encodings should be passed in as <tt class="xref docutils literal"><spa n class="pre">unicode</span></tt>.</p>
301 <p><em>object_hook</em>, if specified, will be called with the result of every J SON
302 object decoded and its return value will be used in place of the given
303 <tt class="xref docutils literal"><span class="pre">dict</span></tt>. This can be used to provide custom deserializations (e.g. to
304 support JSON-RPC class hinting).</p>
305 <p><em>parse_float</em>, if specified, will be called with the string of every J SON
306 float to be decoded. By default, this is equivalent to <tt class="docutils lite ral"><span class="pre">float(num_str)</span></tt>.
307 This can be used to use another datatype or parser for JSON floats
308 (e.g. <tt class="xref docutils literal"><span class="pre">decimal.Decimal</span> </tt>).</p>
309 <p><em>parse_int</em>, if specified, will be called with the string of every JSO N int
310 to be decoded. By default, this is equivalent to <tt class="docutils literal">< span class="pre">int(num_str)</span></tt>. This can
311 be used to use another datatype or parser for JSON integers
312 (e.g. <tt class="xref docutils literal"><span class="pre">float</span></tt>).</p >
313 <p><em>parse_constant</em>, if specified, will be called with one of the followi ng
314 strings: <tt class="docutils literal"><span class="pre">'-Infinity'</span></tt>, <tt class="docutils literal"><span class="pre">'Infinity'</span></tt>, <tt clas s="docutils literal"><span class="pre">'NaN'</span></tt>. This can be used to
315 raise an exception if invalid JSON numbers are encountered.</p>
316 <p><em>strict</em> controls the parser&#8217;s behavior when it encounters an in valid
317 control character in a string. The default setting of <tt class="xref docutils l iteral"><span class="pre">True</span></tt> means that
318 unescaped control characters are parse errors, if <tt class="xref docutils liter al"><span class="pre">False</span></tt> then control
319 characters will be allowed in strings.</p>
320 <dl class="method">
321 <dt id="simplejson.JSONDecoder.decode">
322 <!--[simplejson.JSONDecoder.decode]--><tt class="descname">decode</tt><big>(</bi g><em>s</em><big>)</big><a class="headerlink" href="#simplejson.JSONDecoder.deco de" title="Permalink to this definition">¶</a></dt>
323 <dd>Return the Python representation of <em>s</em> (a <tt class="xref docutils l iteral"><span class="pre">str</span></tt> or
324 <tt class="xref docutils literal"><span class="pre">unicode</span></tt> instance containing a JSON document)</dd></dl>
325
326 <dl class="method">
327 <dt id="simplejson.JSONDecoder.raw_decode">
328 <!--[simplejson.JSONDecoder.raw_decode]--><tt class="descname">raw_decode</tt><b ig>(</big><em>s</em><big>)</big><a class="headerlink" href="#simplejson.JSONDeco der.raw_decode" title="Permalink to this definition">¶</a></dt>
329 <dd><p>Decode a JSON document from <em>s</em> (a <tt class="xref docutils litera l"><span class="pre">str</span></tt> or <tt class="xref docutils literal"><span class="pre">unicode</span></tt>
330 beginning with a JSON document) and return a 2-tuple of the Python
331 representation and the index in <em>s</em> where the document ended.</p>
332 <p>This can be used to decode a JSON document from a string that may have
333 extraneous data at the end.</p>
334 </dd></dl>
335
336 </dd></dl>
337
338 <dl class="class">
339 <dt id="simplejson.JSONEncoder">
340 <!--[simplejson.JSONEncoder]-->class <tt class="descclassname">simplejson.</tt>< tt class="descname">JSONEncoder</tt><big>(</big><span class="optional">[</span>< em>skipkeys</em><span class="optional">[</span>, <em>ensure_ascii</em><span clas s="optional">[</span>, <em>check_circular</em><span class="optional">[</span>, < em>allow_nan</em><span class="optional">[</span>, <em>sort_keys</em><span class= "optional">[</span>, <em>indent</em><span class="optional">[</span>, <em>separat ors</em><span class="optional">[</span>, <em>encoding</em><span class="optional" >[</span>, <em>default</em><span class="optional">]</span><span class="optional" >]</span><span class="optional">]</span><span class="optional">]</span><span cla ss="optional">]</span><span class="optional">]</span><span class="optional">]</s pan><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#simplejson.JSONEncoder" title="Permalink to this defi nition">¶</a></dt>
341 <dd><p>Extensible JSON encoder for Python data structures.</p>
342 <p>Supports the following objects and types by default:</p>
343 <table border="1" class="docutils">
344 <colgroup>
345 <col width="56%" />
346 <col width="44%" />
347 </colgroup>
348 <thead valign="bottom">
349 <tr><th class="head">Python</th>
350 <th class="head">JSON</th>
351 </tr>
352 </thead>
353 <tbody valign="top">
354 <tr><td>dict</td>
355 <td>object</td>
356 </tr>
357 <tr><td>list, tuple</td>
358 <td>array</td>
359 </tr>
360 <tr><td>str, unicode</td>
361 <td>string</td>
362 </tr>
363 <tr><td>int, long, float</td>
364 <td>number</td>
365 </tr>
366 <tr><td>True</td>
367 <td>true</td>
368 </tr>
369 <tr><td>False</td>
370 <td>false</td>
371 </tr>
372 <tr><td>None</td>
373 <td>null</td>
374 </tr>
375 </tbody>
376 </table>
377 <p>To extend this to recognize other objects, subclass and implement a
378 <a title="simplejson.JSONEncoder.default" class="reference internal" href="#simp lejson.JSONEncoder.default"><tt class="xref docutils literal"><span class="pre"> default()</span></tt></a> method with another method that returns a serializable object
379 for <tt class="docutils literal"><span class="pre">o</span></tt> if possible, ot herwise it should call the superclass implementation
380 (to raise <tt class="xref docutils literal"><span class="pre">TypeError</span></ tt>).</p>
381 <p>If <em>skipkeys</em> is false (the default), then it is a <tt class="xref doc utils literal"><span class="pre">TypeError</span></tt> to
382 attempt encoding of keys that are not str, int, long, float or None. If
383 <em>skipkeys</em> is true, such items are simply skipped.</p>
384 <p>If <em>ensure_ascii</em> is true (the default), the output is guaranteed to b e
385 <tt class="xref docutils literal"><span class="pre">str</span></tt> objects with all incoming unicode characters escaped. If
386 <em>ensure_ascii</em> is false, the output will be a unicode object.</p>
387 <p>If <em>check_circular</em> is false (the default), then lists, dicts, and cus tom
388 encoded objects will be checked for circular references during encoding to
389 prevent an infinite recursion (which would cause an <tt class="xref docutils lit eral"><span class="pre">OverflowError</span></tt>).
390 Otherwise, no such check takes place.</p>
391 <p>If <em>allow_nan</em> is true (the default), then <tt class="docutils literal "><span class="pre">NaN</span></tt>, <tt class="docutils literal"><span class="p re">Infinity</span></tt>, and
392 <tt class="docutils literal"><span class="pre">-Infinity</span></tt> will be enc oded as such. This behavior is not JSON
393 specification compliant, but is consistent with most JavaScript based
394 encoders and decoders. Otherwise, it will be a <tt class="xref docutils literal "><span class="pre">ValueError</span></tt> to encode
395 such floats.</p>
396 <p>If <em>sort_keys</em> is true (the default), then the output of dictionaries
397 will be sorted by key; this is useful for regression tests to ensure that
398 JSON serializations can be compared on a day-to-day basis.</p>
399 <p>If <em>indent</em> is a non-negative integer (it is <tt class="xref docutils literal"><span class="pre">None</span></tt> by default), then JSON
400 array elements and object members will be pretty-printed with that indent
401 level. An indent level of 0 will only insert newlines. <tt class="xref docutil s literal"><span class="pre">None</span></tt> is the most
402 compact representation.</p>
403 <p>If specified, <em>separators</em> should be an <tt class="docutils literal">< span class="pre">(item_separator,</span> <span class="pre">key_separator)</span> </tt>
404 tuple. By default, <tt class="docutils literal"><span class="pre">(',</span> <s pan class="pre">',</span> <span class="pre">':</span> <span class="pre">')</span ></tt> are used. To get the most compact JSON
405 representation, you should specify <tt class="docutils literal"><span class="pre ">(',',</span> <span class="pre">':')</span></tt> to eliminate whitespace.</p>
406 <p>If specified, <em>default</em> should be a function that gets called for obje cts
407 that can&#8217;t otherwise be serialized. It should return a JSON encodable
408 version of the object or raise a <tt class="xref docutils literal"><span class=" pre">TypeError</span></tt>.</p>
409 <p>If <em>encoding</em> is not <tt class="xref docutils literal"><span class="pr e">None</span></tt>, then all input strings will be transformed
410 into unicode using that encoding prior to JSON-encoding. The default is
411 <tt class="docutils literal"><span class="pre">'utf-8'</span></tt>.</p>
412 <dl class="method">
413 <dt id="simplejson.JSONEncoder.default">
414 <!--[simplejson.JSONEncoder.default]--><tt class="descname">default</tt><big>(</ big><em>o</em><big>)</big><a class="headerlink" href="#simplejson.JSONEncoder.de fault" title="Permalink to this definition">¶</a></dt>
415 <dd><p>Implement this method in a subclass such that it returns a serializable
416 object for <em>o</em>, or calls the base implementation (to raise a
417 <tt class="xref docutils literal"><span class="pre">TypeError</span></tt>).</p>
418 <p>For example, to support arbitrary iterators, you could implement default
419 like this:</p>
420 <div class="highlight"><pre><span class="k">def</span> <span class="nf">default< /span><span class="p">(</span><span class="bp">self</span><span class="p">,</spa n> <span class="n">o</span><span class="p">):</span>
421 <span class="k">try</span><span class="p">:</span>
422 <span class="n">iterable</span> <span class="o">=</span> <span class="nb" >iter</span><span class="p">(</span><span class="n">o</span><span class="p">)</s pan>
423 <span class="k">except</span> <span class="ne">TypeError</span><span class="p ">:</span>
424 <span class="k">pass</span>
425 <span class="k">else</span><span class="p">:</span>
426 <span class="k">return</span> <span class="nb">list</span><span class="p" >(</span><span class="n">iterable</span><span class="p">)</span>
427 <span class="k">return</span> <span class="n">JSONEncoder</span><span class=" o">.</span><span class="n">default</span><span class="p">(</span><span class="bp ">self</span><span class="p">,</span> <span class="n">o</span><span class="p">)< /span>
428 </pre></div>
429 </dd></dl>
430
431 <dl class="method">
432 <dt id="simplejson.JSONEncoder.encode">
433 <!--[simplejson.JSONEncoder.encode]--><tt class="descname">encode</tt><big>(</bi g><em>o</em><big>)</big><a class="headerlink" href="#simplejson.JSONEncoder.enco de" title="Permalink to this definition">¶</a></dt>
434 <dd><p>Return a JSON string representation of a Python data structure, <em>o</em >. For
435 example:</p>
436 <div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k" >import</span> <span class="nn">simplejson</span> <span class="k">as</span> <spa n class="nn">json</span>
437 <span class="gp">&gt;&gt;&gt; </span><span class="n">json</span><span class="o"> .</span><span class="n">JSONEncoder</span><span class="p">()</span><span class=" o">.</span><span class="n">encode</span><span class="p">({</span><span class="s" >&quot;foo&quot;</span><span class="p">:</span> <span class="p">[</span><span cl ass="s">&quot;bar&quot;</span><span class="p">,</span> <span class="s">&quot;baz &quot;</span><span class="p">]})</span>
438 <span class="go">&#39;{&quot;foo&quot;: [&quot;bar&quot;, &quot;baz&quot;]}&#39; </span>
439 </pre></div>
440 </dd></dl>
441
442 <dl class="method">
443 <dt id="simplejson.JSONEncoder.iterencode">
444 <!--[simplejson.JSONEncoder.iterencode]--><tt class="descname">iterencode</tt><b ig>(</big><em>o</em><big>)</big><a class="headerlink" href="#simplejson.JSONEnco der.iterencode" title="Permalink to this definition">¶</a></dt>
445 <dd><p>Encode the given object, <em>o</em>, and yield each string representation as
446 available. For example:</p>
447 <div class="highlight"><pre><span class="k">for</span> <span class="n">chunk</sp an> <span class="ow">in</span> <span class="n">JSONEncoder</span><span class="p" >()</span><span class="o">.</span><span class="n">iterencode</span><span class=" p">(</span><span class="n">bigobject</span><span class="p">):</span>
448 <span class="n">mysocket</span><span class="o">.</span><span class="n">write </span><span class="p">(</span><span class="n">chunk</span><span class="p">)</sp an>
449 </pre></div>
450 <p>Note that <a title="simplejson.JSONEncoder.encode" class="reference internal" href="#simplejson.JSONEncoder.encode"><tt class="xref docutils literal"><span c lass="pre">encode()</span></tt></a> has much better performance than
451 <a title="simplejson.JSONEncoder.iterencode" class="reference internal" href="#s implejson.JSONEncoder.iterencode"><tt class="xref docutils literal"><span class= "pre">iterencode()</span></tt></a>.</p>
452 </dd></dl>
453
454 </dd></dl>
455
456 </div>
457 </div>
458
459
460 </div>
461 </div>
462 </div>
463 <div class="sphinxsidebar">
464 <div class="sphinxsidebarwrapper">
465 <h3>Table Of Contents</h3>
466 <ul>
467 <li><a class="reference external" href=""><tt class="docutils literal"><span cla ss="pre">simplejson</span></tt> &#8212; JSON encoder and decoder</a><ul>
468 <li><a class="reference external" href="#basic-usage">Basic Usage</a></li>
469 <li><a class="reference external" href="#encoders-and-decoders">Encoders and dec oders</a></li>
470 </ul>
471 </li>
472 </ul>
473
474 <h3>This Page</h3>
475 <ul class="this-page-menu">
476 <li><a href="_sources/index.txt">Show Source</a></li>
477 </ul>
478 <h3>Quick search</h3>
479 <form class="search" action="search.html" method="get">
480 <input type="text" name="q" size="18" /> <input type="submit" valu e="Go" />
481 <input type="hidden" name="check_keywords" value="yes" />
482 <input type="hidden" name="area" value="default" />
483 </form>
484 </div>
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486 <div class="clearer"></div>
487 </div>
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489 <h3>Navigation</h3>
490 <ul>
491 <li class="right" style="margin-right: 10px">
492 <a href="genindex.html" title="General Index"
493 accesskey="I">index</a></li>
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495 </ul>
496 </div>
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498 &copy; Copyright 2008, Bob Ippolito.
499 Last updated on Feb 18, 2009.
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