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+ <div class="section" id="module-simplejson"> |
+<h1 id="module-simplejson"><tt class="xref docutils literal"><span class="pre">simplejson</span></tt> — JSON encoder and decoder<a class="headerlink" href="#module-simplejson" title="Permalink to this headline">¶</a></h1> |
+<p>JSON (JavaScript Object Notation) <<a class="reference external" href="http://json.org">http://json.org</a>> is a subset of JavaScript |
+syntax (ECMA-262 3rd edition) used as a lightweight data interchange format.</p> |
+<p><tt class="xref docutils literal"><span class="pre">simplejson</span></tt> exposes an API familiar to users of the standard library |
+<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 is the externally maintained |
+version of the <tt class="xref docutils literal"><span class="pre">json</span></tt> 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.</p> |
+<p>Encoding basic Python object hierarchies:</p> |
+<div class="highlight"><pre><span class="gp">>>> </span><span class="k">import</span> <span class="nn">simplejson</span> <span class="k">as</span> <span class="nn">json</span> |
+<span class="gp">>>> </span><span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">([</span><span class="s">'foo'</span><span class="p">,</span> <span class="p">{</span><span class="s">'bar'</span><span class="p">:</span> <span class="p">(</span><span class="s">'baz'</span><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><span class="p">)}])</span> |
+<span class="go">'["foo", {"bar": ["baz", null, 1.0, 2]}]'</span> |
+<span class="gp">>>> </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">"</span><span class="se">\"</span><span class="s">foo</span><span class="se">\b</span><span class="s">ar"</span><span class="p">)</span> |
+<span class="go">"\"foo\bar"</span> |
+<span class="gp">>>> </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'</span><span class="se">\u1234</span><span class="s">'</span><span class="p">)</span> |
+<span class="go">"\u1234"</span> |
+<span class="gp">>>> </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">'</span><span class="se">\\</span><span class="s">'</span><span class="p">)</span> |
+<span class="go">"\\"</span> |
+<span class="gp">>>> </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">"c"</span><span class="p">:</span> <span class="mf">0</span><span class="p">,</span> <span class="s">"b"</span><span class="p">:</span> <span class="mf">0</span><span class="p">,</span> <span class="s">"a"</span><span class="p">:</span> <span class="mf">0</span><span class="p">},</span> <span class="n">sort_keys</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span> |
+<span class="go">{"a": 0, "b": 0, "c": 0}</span> |
+<span class="gp">>>> </span><span class="k">from</span> <span class="nn">StringIO</span> <span class="k">import</span> <span class="n">StringIO</span> |
+<span class="gp">>>> </span><span class="n">io</span> <span class="o">=</span> <span class="n">StringIO</span><span class="p">()</span> |
+<span class="gp">>>> </span><span class="n">json</span><span class="o">.</span><span class="n">dump</span><span class="p">([</span><span class="s">'streaming API'</span><span class="p">],</span> <span class="n">io</span><span class="p">)</span> |
+<span class="gp">>>> </span><span class="n">io</span><span class="o">.</span><span class="n">getvalue</span><span class="p">()</span> |
+<span class="go">'["streaming API"]'</span> |
+</pre></div> |
+<p>Compact encoding:</p> |
+<div class="highlight"><pre><span class="gp">>>> </span><span class="k">import</span> <span class="nn">simplejson</span> <span class="k">as</span> <span class="nn">json</span> |
+<span class="gp">>>> </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">'4'</span><span class="p">:</span> <span class="mf">5</span><span class="p">,</span> <span class="s">'6'</span><span class="p">:</span> <span class="mf">7</span><span class="p">}],</span> <span class="n">separators</span><span class="o">=</span><span class="p">(</span><span class="s">','</span><span class="p">,</span><span class="s">':'</span><span class="p">))</span> |
+<span class="go">'[1,2,3,{"4":5,"6":7}]'</span> |
+</pre></div> |
+<p>Pretty printing:</p> |
+<div class="highlight"><pre><span class="gp">>>> </span><span class="k">import</span> <span class="nn">simplejson</span> <span class="k">as</span> <span class="nn">json</span> |
+<span class="gp">>>> </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">'4'</span><span class="p">:</span> <span class="mf">5</span><span class="p">,</span> <span class="s">'6'</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="bp">True</span><span class="p">,</span> <span class="n">indent</span><span class="o">=</span><span class="mf">4</span><span class="p">)</span> |
+<span class="gp">>>> </span><span class="k">print</span> <span class="s">'</span><span class="se">\n</span><span class="s">'</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">splitlines</span><span class="p">()])</span> |
+<span class="go">{</span> |
+<span class="go"> "4": 5,</span> |
+<span class="go"> "6": 7</span> |
+<span class="go">}</span> |
+</pre></div> |
+<p>Decoding JSON:</p> |
+<div class="highlight"><pre><span class="gp">>>> </span><span class="k">import</span> <span class="nn">simplejson</span> <span class="k">as</span> <span class="nn">json</span> |
+<span class="gp">>>> </span><span class="n">obj</span> <span class="o">=</span> <span class="p">[</span><span class="s">u'foo'</span><span class="p">,</span> <span class="p">{</span><span class="s">u'bar'</span><span class="p">:</span> <span class="p">[</span><span class="s">u'baz'</span><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><span class="p">]}]</span> |
+<span class="gp">>>> </span><span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="s">'["foo", {"bar":["baz", null, 1.0, 2]}]'</span><span class="p">)</span> <span class="o">==</span> <span class="n">obj</span> |
+<span class="go">True</span> |
+<span class="gp">>>> </span><span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="s">'"</span><span class="se">\\</span><span class="s">"foo</span><span class="se">\\</span><span class="s">bar"'</span><span class="p">)</span> <span class="o">==</span> <span class="s">u'"foo</span><span class="se">\x08</span><span class="s">ar'</span> |
+<span class="go">True</span> |
+<span class="gp">>>> </span><span class="k">from</span> <span class="nn">StringIO</span> <span class="k">import</span> <span class="n">StringIO</span> |
+<span class="gp">>>> </span><span class="n">io</span> <span class="o">=</span> <span class="n">StringIO</span><span class="p">(</span><span class="s">'["streaming API"]'</span><span class="p">)</span> |
+<span class="gp">>>> </span><span class="n">json</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">io</span><span class="p">)[</span><span class="mf">0</span><span class="p">]</span> <span class="o">==</span> <span class="s">'streaming API'</span> |
+<span class="go">True</span> |
+</pre></div> |
+<p>Specializing JSON object decoding:</p> |
+<div class="highlight"><pre><span class="gp">>>> </span><span class="k">import</span> <span class="nn">simplejson</span> <span class="k">as</span> <span class="nn">json</span> |
+<span class="gp">>>> </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> |
+<span class="gp">... </span> <span class="k">if</span> <span class="s">'__complex__'</span> <span class="ow">in</span> <span class="n">dct</span><span class="p">:</span> |
+<span class="gp">... </span> <span class="k">return</span> <span class="nb">complex</span><span class="p">(</span><span class="n">dct</span><span class="p">[</span><span class="s">'real'</span><span class="p">],</span> <span class="n">dct</span><span class="p">[</span><span class="s">'imag'</span><span class="p">])</span> |
+<span class="gp">... </span> <span class="k">return</span> <span class="n">dct</span> |
+<span class="gp">...</span> |
+<span class="gp">>>> </span><span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="s">'{"__complex__": true, "real": 1, "imag": 2}'</span><span class="p">,</span> |
+<span class="gp">... </span> <span class="n">object_hook</span><span class="o">=</span><span class="n">as_complex</span><span class="p">)</span> |
+<span class="go">(1+2j)</span> |
+<span class="gp">>>> </span><span class="k">import</span> <span class="nn">decimal</span> |
+<span class="gp">>>> </span><span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="s">'1.1'</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 class="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><span class="p">(</span><span class="s">'1.1'</span><span class="p">)</span> |
+<span class="go">True</span> |
+</pre></div> |
+<p>Specializing JSON object encoding:</p> |
+<div class="highlight"><pre><span class="gp">>>> </span><span class="k">import</span> <span class="nn">simplejson</span> <span class="k">as</span> <span class="nn">json</span> |
+<span class="gp">>>> </span><span class="k">def</span> <span class="nf">encode_complex</span><span class="p">(</span><span class="n">obj</span><span class="p">):</span> |
+<span class="gp">... </span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">obj</span><span class="p">,</span> <span class="nb">complex</span><span class="p">):</span> |
+<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">.</span><span class="n">imag</span><span class="p">]</span> |
+<span class="gp">... </span> <span class="k">raise</span> <span class="ne">TypeError</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">+</span> <span class="s">" is not JSON serializable"</span><span class="p">)</span> |
+<span class="gp">...</span> |
+<span class="gp">>>> </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> |
+<span class="go">'[2.0, 1.0]'</span> |
+<span class="gp">>>> </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><span 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> |
+<span class="go">'[2.0, 1.0]'</span> |
+<span class="gp">>>> </span><span class="s">''</span><span class="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 class="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 class="n">iterencode</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="go">'[2.0, 1.0]'</span> |
+</pre></div> |
+<p>Using <tt class="xref docutils literal"><span class="pre">simplejson.tool</span></tt> from the shell to validate and pretty-print:</p> |
+<div class="highlight"><pre>$ 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) |
+</pre></div> |
+<div class="admonition note"> |
+<p class="first admonition-title">Note</p> |
+<p class="last">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.</p> |
+</div> |
+<div class="section" id="basic-usage"> |
+<h2 id="basic-usage">Basic Usage<a class="headerlink" href="#basic-usage" title="Permalink to this headline">¶</a></h2> |
+<dl class="function"> |
+<dt id="simplejson.dump"> |
+<!--[simplejson.dump]--><tt class="descclassname">simplejson.</tt><tt class="descname">dump</tt><big>(</big><em>obj</em>, <em>fp</em><span class="optional">[</span>, <em>skipkeys</em><span class="optional">[</span>, <em>ensure_ascii</em><span class="optional">[</span>, <em>check_circular</em><span class="optional">[</span>, <em>allow_nan</em><span class="optional">[</span>, <em>cls</em><span class="optional">[</span>, <em>indent</em><span class="optional">[</span>, <em>separators</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">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#simplejson.dump" title="Permalink to this definition">¶</a></dt> |
+<dd><p>Serialize <em>obj</em> as a JSON formatted stream to <em>fp</em> (a <tt class="docutils literal"><span class="pre">.write()</span></tt>-supporting |
+file-like object).</p> |
+<p>If <em>skipkeys</em> is true (default: <tt class="xref docutils literal"><span class="pre">False</span></tt>), then dict keys that are not |
+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="xref docutils literal"><span class="pre">long</span></tt>, |
+<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 docutils literal"><span class="pre">None</span></tt>) will be skipped instead of raising a |
+<tt class="xref docutils literal"><span class="pre">TypeError</span></tt>.</p> |
+<p>If <em>ensure_ascii</em> is false (default: <tt class="xref docutils literal"><span class="pre">True</span></tt>), then some chunks written |
+to <em>fp</em> may be <tt class="xref docutils literal"><span class="pre">unicode</span></tt> instances, subject to normal Python |
+<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> |
+explicitly understands <tt class="xref docutils literal"><span class="pre">unicode</span></tt> (as in <tt class="xref docutils literal"><span class="pre">codecs.getwriter()</span></tt>) this |
+is likely to cause an error. It’s best to leave the default settings, because |
+they are safe and it is highly optimized.</p> |
+<p>If <em>check_circular</em> is false (default: <tt class="xref docutils literal"><span class="pre">True</span></tt>), then the circular |
+reference check for container types will be skipped and a circular reference |
+will result in an <tt class="xref docutils literal"><span class="pre">OverflowError</span></tt> (or worse).</p> |
+<p>If <em>allow_nan</em> is false (default: <tt class="xref docutils literal"><span class="pre">True</span></tt>), then it will be a |
+<tt class="xref docutils literal"><span class="pre">ValueError</span></tt> to serialize 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>, |
+<tt class="docutils literal"><span class="pre">inf</span></tt>, <tt class="docutils literal"><span class="pre">-inf</span></tt>) in strict compliance of the JSON specification. |
+If <em>allow_nan</em> is true, their JavaScript equivalents will be used |
+(<tt class="docutils literal"><span class="pre">NaN</span></tt>, <tt class="docutils literal"><span class="pre">Infinity</span></tt>, <tt class="docutils literal"><span class="pre">-Infinity</span></tt>).</p> |
+<p>If <em>indent</em> 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. <tt class="xref docutils literal"><span class="pre">None</span></tt> (the default) selects the most compact |
+representation.</p> |
+<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> |
+tuple. By default, <tt class="docutils literal"><span class="pre">(',</span> <span class="pre">',</span> <span class="pre">':</span> <span class="pre">')</span></tt> are used. To get the most compact JSON |
+representation, you should specify <tt class="docutils literal"><span class="pre">(',',</span> <span class="pre">':')</span></tt> to eliminate whitespace.</p> |
+<p><em>encoding</em> is the character encoding for str instances, default is |
+<tt class="docutils literal"><span class="pre">'utf-8'</span></tt>.</p> |
+<p>If specified, <em>default</em> 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 <tt class="xref docutils literal"><span class="pre">TypeError</span></tt>. If not specified, |
+<tt class="xref docutils literal"><span class="pre">TypeError</span></tt> is always raised in those cases.</p> |
+<p>To use a custom <a title="simplejson.JSONEncoder" class="reference internal" href="#simplejson.JSONEncoder"><tt class="xref docutils literal"><span class="pre">JSONEncoder</span></tt></a> subclass (e.g. one that overrides the |
+<tt class="xref docutils literal"><span class="pre">default()</span></tt> method to serialize additional types), specify it with the |
+<em>cls</em> kwarg.</p> |
+<blockquote> |
+<div class="admonition note"> |
+<p class="first admonition-title">Note</p> |
+<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 literal"><span class="pre">marshal</span></tt> it |
+does not make sense to serialize more than one JSON document without some |
+container protocol to delimit them.</p> |
+</div> |
+</blockquote> |
+</dd></dl> |
+ |
+<dl class="function"> |
+<dt id="simplejson.dumps"> |
+<!--[simplejson.dumps]--><tt class="descclassname">simplejson.</tt><tt class="descname">dumps</tt><big>(</big><em>obj</em><span class="optional">[</span>, <em>skipkeys</em><span class="optional">[</span>, <em>ensure_ascii</em><span class="optional">[</span>, <em>check_circular</em><span class="optional">[</span>, <em>allow_nan</em><span class="optional">[</span>, <em>cls</em><span class="optional">[</span>, <em>indent</em><span class="optional">[</span>, <em>separators</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">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#simplejson.dumps" title="Permalink to this definition">¶</a></dt> |
+<dd><p>Serialize <em>obj</em> to a JSON formatted <tt class="xref docutils literal"><span class="pre">str</span></tt>.</p> |
+<p>If <em>ensure_ascii</em> is false, then the return value will be a |
+<tt class="xref docutils literal"><span class="pre">unicode</span></tt> instance. The other arguments have the same meaning as in |
+<a title="simplejson.dump" class="reference internal" href="#simplejson.dump"><tt class="xref docutils literal"><span class="pre">dump()</span></tt></a>. Note that the default <em>ensure_ascii</em> setting has much |
+better performance.</p> |
+</dd></dl> |
+ |
+<dl class="function"> |
+<dt id="simplejson.load"> |
+<!--[simplejson.load]--><tt class="descclassname">simplejson.</tt><tt class="descname">load</tt><big>(</big><em>fp</em><span class="optional">[</span>, <em>encoding</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">[</span>, <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="headerlink" href="#simplejson.load" title="Permalink to this definition">¶</a></dt> |
+<dd><p>Deserialize <em>fp</em> (a <tt class="docutils literal"><span class="pre">.read()</span></tt>-supporting file-like object containing a JSON |
+document) to a Python object.</p> |
+<p>If the contents of <em>fp</em> are encoded with an ASCII based encoding other than |
+UTF-8 (e.g. latin-1), then an appropriate <em>encoding</em> name must be specified. |
+Encodings that are not ASCII based (such as UCS-2) are not allowed, and |
+should be wrapped with <tt class="docutils literal"><span class="pre">codecs.getreader(fp)(encoding)</span></tt>, or simply decoded |
+to a <tt class="xref docutils literal"><span class="pre">unicode</span></tt> object and passed to <a title="simplejson.loads" class="reference internal" href="#simplejson.loads"><tt class="xref docutils literal"><span class="pre">loads()</span></tt></a>. The default |
+setting of <tt class="docutils literal"><span class="pre">'utf-8'</span></tt> is fastest and should be using whenever possible.</p> |
+<p><em>object_hook</em> is an optional function that will be called with the result of |
+any object literal decode (a <tt class="xref docutils literal"><span class="pre">dict</span></tt>). The return value of |
+<em>object_hook</em> will be used instead of the <tt class="xref docutils literal"><span class="pre">dict</span></tt>. This feature can be used |
+to implement custom decoders (e.g. JSON-RPC class hinting).</p> |
+<p><em>parse_float</em>, if specified, will be called with the string of every JSON |
+float to be decoded. By default, this is equivalent to <tt class="docutils literal"><span class="pre">float(num_str)</span></tt>. |
+This can be used to use another datatype or parser for JSON floats |
+(e.g. <tt class="xref docutils literal"><span class="pre">decimal.Decimal</span></tt>).</p> |
+<p><em>parse_int</em>, if specified, will be called with the string of every JSON int |
+to be decoded. By default, this is equivalent to <tt class="docutils literal"><span class="pre">int(num_str)</span></tt>. This can |
+be used to use another datatype or parser for JSON integers |
+(e.g. <tt class="xref docutils literal"><span class="pre">float</span></tt>).</p> |
+<p><em>parse_constant</em>, if specified, will be called with one of the following |
+strings: <tt class="docutils literal"><span class="pre">'-Infinity'</span></tt>, <tt class="docutils literal"><span class="pre">'Infinity'</span></tt>, <tt class="docutils literal"><span class="pre">'NaN'</span></tt>. This can be used to |
+raise an exception if invalid JSON numbers are encountered.</p> |
+<p>To use a custom <a title="simplejson.JSONDecoder" class="reference internal" href="#simplejson.JSONDecoder"><tt class="xref docutils literal"><span class="pre">JSONDecoder</span></tt></a> subclass, specify it with the <tt class="docutils literal"><span class="pre">cls</span></tt> |
+kwarg. Additional keyword arguments will be passed to the constructor of the |
+class.</p> |
+<blockquote> |
+<div class="admonition note"> |
+<p class="first admonition-title">Note</p> |
+<p class="last"><a title="simplejson.load" class="reference internal" href="#simplejson.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 |
+then call <a title="simplejson.loads" class="reference internal" href="#simplejson.loads"><tt class="xref docutils literal"><span class="pre">loads()</span></tt></a>. 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 <a title="simplejson.loads" class="reference internal" href="#simplejson.loads"><tt class="xref docutils literal"><span class="pre">loads()</span></tt></a>.</p> |
+</div> |
+</blockquote> |
+</dd></dl> |
+ |
+<dl class="function"> |
+<dt id="simplejson.loads"> |
+<!--[simplejson.loads]--><tt class="descclassname">simplejson.</tt><tt class="descname">loads</tt><big>(</big><em>s</em><span class="optional">[</span>, <em>encoding</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">[</span>, <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="headerlink" href="#simplejson.loads" title="Permalink to this definition">¶</a></dt> |
+<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">unicode</span></tt> instance containing a JSON |
+document) to a Python object.</p> |
+<p>If <em>s</em> is a <tt class="xref docutils literal"><span class="pre">str</span></tt> instance and is encoded with an ASCII based encoding |
+other than UTF-8 (e.g. latin-1), then an appropriate <em>encoding</em> name must be |
+specified. Encodings that are not ASCII based (such as UCS-2) are not |
+allowed and should be decoded to <tt class="xref docutils literal"><span class="pre">unicode</span></tt> first.</p> |
+<p>The other arguments have the same meaning as in <a title="simplejson.load" class="reference internal" href="#simplejson.load"><tt class="xref docutils literal"><span class="pre">load()</span></tt></a>.</p> |
+</dd></dl> |
+ |
+</div> |
+<div class="section" id="encoders-and-decoders"> |
+<h2 id="encoders-and-decoders">Encoders and decoders<a class="headerlink" href="#encoders-and-decoders" title="Permalink to this headline">¶</a></h2> |
+<dl class="class"> |
+<dt id="simplejson.JSONDecoder"> |
+<!--[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>parse_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 class="headerlink" href="#simplejson.JSONDecoder" title="Permalink to this definition">¶</a></dt> |
+<dd><p>Simple JSON decoder.</p> |
+<p>Performs the following translations in decoding by default:</p> |
+<table border="1" class="docutils"> |
+<colgroup> |
+<col width="44%" /> |
+<col width="56%" /> |
+</colgroup> |
+<thead valign="bottom"> |
+<tr><th class="head">JSON</th> |
+<th class="head">Python</th> |
+</tr> |
+</thead> |
+<tbody valign="top"> |
+<tr><td>object</td> |
+<td>dict</td> |
+</tr> |
+<tr><td>array</td> |
+<td>list</td> |
+</tr> |
+<tr><td>string</td> |
+<td>unicode</td> |
+</tr> |
+<tr><td>number (int)</td> |
+<td>int, long</td> |
+</tr> |
+<tr><td>number (real)</td> |
+<td>float</td> |
+</tr> |
+<tr><td>true</td> |
+<td>True</td> |
+</tr> |
+<tr><td>false</td> |
+<td>False</td> |
+</tr> |
+<tr><td>null</td> |
+<td>None</td> |
+</tr> |
+</tbody> |
+</table> |
+<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 |
+corresponding <tt class="docutils literal"><span class="pre">float</span></tt> values, which is outside the JSON spec.</p> |
+<p><em>encoding</em> determines the encoding used to interpret any <tt class="xref docutils literal"><span class="pre">str</span></tt> objects |
+decoded by this instance (<tt class="docutils literal"><span class="pre">'utf-8'</span></tt> by default). It has no effect when decoding |
+<tt class="xref docutils literal"><span class="pre">unicode</span></tt> objects.</p> |
+<p>Note that currently only encodings that are a superset of ASCII work, strings |
+of other encodings should be passed in as <tt class="xref docutils literal"><span class="pre">unicode</span></tt>.</p> |
+<p><em>object_hook</em>, 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 |
+<tt class="xref docutils literal"><span class="pre">dict</span></tt>. This can be used to provide custom deserializations (e.g. to |
+support JSON-RPC class hinting).</p> |
+<p><em>parse_float</em>, if specified, will be called with the string of every JSON |
+float to be decoded. By default, this is equivalent to <tt class="docutils literal"><span class="pre">float(num_str)</span></tt>. |
+This can be used to use another datatype or parser for JSON floats |
+(e.g. <tt class="xref docutils literal"><span class="pre">decimal.Decimal</span></tt>).</p> |
+<p><em>parse_int</em>, if specified, will be called with the string of every JSON int |
+to be decoded. By default, this is equivalent to <tt class="docutils literal"><span class="pre">int(num_str)</span></tt>. This can |
+be used to use another datatype or parser for JSON integers |
+(e.g. <tt class="xref docutils literal"><span class="pre">float</span></tt>).</p> |
+<p><em>parse_constant</em>, if specified, will be called with one of the following |
+strings: <tt class="docutils literal"><span class="pre">'-Infinity'</span></tt>, <tt class="docutils literal"><span class="pre">'Infinity'</span></tt>, <tt class="docutils literal"><span class="pre">'NaN'</span></tt>. This can be used to |
+raise an exception if invalid JSON numbers are encountered.</p> |
+<p><em>strict</em> controls the parser’s behavior when it encounters an invalid |
+control character in a string. The default setting of <tt class="xref docutils literal"><span class="pre">True</span></tt> means that |
+unescaped control characters are parse errors, if <tt class="xref docutils literal"><span class="pre">False</span></tt> then control |
+characters will be allowed in strings.</p> |
+<dl class="method"> |
+<dt id="simplejson.JSONDecoder.decode"> |
+<!--[simplejson.JSONDecoder.decode]--><tt class="descname">decode</tt><big>(</big><em>s</em><big>)</big><a class="headerlink" href="#simplejson.JSONDecoder.decode" title="Permalink to this definition">¶</a></dt> |
+<dd>Return the Python representation of <em>s</em> (a <tt class="xref docutils literal"><span class="pre">str</span></tt> or |
+<tt class="xref docutils literal"><span class="pre">unicode</span></tt> instance containing a JSON document)</dd></dl> |
+ |
+<dl class="method"> |
+<dt id="simplejson.JSONDecoder.raw_decode"> |
+<!--[simplejson.JSONDecoder.raw_decode]--><tt class="descname">raw_decode</tt><big>(</big><em>s</em><big>)</big><a class="headerlink" href="#simplejson.JSONDecoder.raw_decode" title="Permalink to this definition">¶</a></dt> |
+<dd><p>Decode a JSON document from <em>s</em> (a <tt class="xref docutils literal"><span class="pre">str</span></tt> or <tt class="xref docutils literal"><span class="pre">unicode</span></tt> |
+beginning with a JSON document) and return a 2-tuple of the Python |
+representation and the index in <em>s</em> where the document ended.</p> |
+<p>This can be used to decode a JSON document from a string that may have |
+extraneous data at the end.</p> |
+</dd></dl> |
+ |
+</dd></dl> |
+ |
+<dl class="class"> |
+<dt id="simplejson.JSONEncoder"> |
+<!--[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 class="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>separators</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 class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#simplejson.JSONEncoder" title="Permalink to this definition">¶</a></dt> |
+<dd><p>Extensible JSON encoder for Python data structures.</p> |
+<p>Supports the following objects and types by default:</p> |
+<table border="1" class="docutils"> |
+<colgroup> |
+<col width="56%" /> |
+<col width="44%" /> |
+</colgroup> |
+<thead valign="bottom"> |
+<tr><th class="head">Python</th> |
+<th class="head">JSON</th> |
+</tr> |
+</thead> |
+<tbody valign="top"> |
+<tr><td>dict</td> |
+<td>object</td> |
+</tr> |
+<tr><td>list, tuple</td> |
+<td>array</td> |
+</tr> |
+<tr><td>str, unicode</td> |
+<td>string</td> |
+</tr> |
+<tr><td>int, long, float</td> |
+<td>number</td> |
+</tr> |
+<tr><td>True</td> |
+<td>true</td> |
+</tr> |
+<tr><td>False</td> |
+<td>false</td> |
+</tr> |
+<tr><td>None</td> |
+<td>null</td> |
+</tr> |
+</tbody> |
+</table> |
+<p>To extend this to recognize other objects, subclass and implement a |
+<a title="simplejson.JSONEncoder.default" class="reference internal" href="#simplejson.JSONEncoder.default"><tt class="xref docutils literal"><span class="pre">default()</span></tt></a> method with another method that returns a serializable object |
+for <tt class="docutils literal"><span class="pre">o</span></tt> if possible, otherwise it should call the superclass implementation |
+(to raise <tt class="xref docutils literal"><span class="pre">TypeError</span></tt>).</p> |
+<p>If <em>skipkeys</em> is false (the default), then it is a <tt class="xref docutils literal"><span class="pre">TypeError</span></tt> to |
+attempt encoding of keys that are not str, int, long, float or None. If |
+<em>skipkeys</em> is true, such items are simply skipped.</p> |
+<p>If <em>ensure_ascii</em> is true (the default), the output is guaranteed to be |
+<tt class="xref docutils literal"><span class="pre">str</span></tt> objects with all incoming unicode characters escaped. If |
+<em>ensure_ascii</em> is false, the output will be a unicode object.</p> |
+<p>If <em>check_circular</em> 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 <tt class="xref docutils literal"><span class="pre">OverflowError</span></tt>). |
+Otherwise, no such check takes place.</p> |
+<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="pre">Infinity</span></tt>, and |
+<tt class="docutils literal"><span class="pre">-Infinity</span></tt> 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 <tt class="xref docutils literal"><span class="pre">ValueError</span></tt> to encode |
+such floats.</p> |
+<p>If <em>sort_keys</em> 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.</p> |
+<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 |
+array elements and object members will be pretty-printed with that indent |
+level. An indent level of 0 will only insert newlines. <tt class="xref docutils literal"><span class="pre">None</span></tt> is the most |
+compact representation.</p> |
+<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> |
+tuple. By default, <tt class="docutils literal"><span class="pre">(',</span> <span class="pre">',</span> <span class="pre">':</span> <span class="pre">')</span></tt> are used. To get the most compact JSON |
+representation, you should specify <tt class="docutils literal"><span class="pre">(',',</span> <span class="pre">':')</span></tt> to eliminate whitespace.</p> |
+<p>If specified, <em>default</em> 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 <tt class="xref docutils literal"><span class="pre">TypeError</span></tt>.</p> |
+<p>If <em>encoding</em> is not <tt class="xref docutils literal"><span class="pre">None</span></tt>, then all input strings will be transformed |
+into unicode using that encoding prior to JSON-encoding. The default is |
+<tt class="docutils literal"><span class="pre">'utf-8'</span></tt>.</p> |
+<dl class="method"> |
+<dt id="simplejson.JSONEncoder.default"> |
+<!--[simplejson.JSONEncoder.default]--><tt class="descname">default</tt><big>(</big><em>o</em><big>)</big><a class="headerlink" href="#simplejson.JSONEncoder.default" title="Permalink to this definition">¶</a></dt> |
+<dd><p>Implement this method in a subclass such that it returns a serializable |
+object for <em>o</em>, or calls the base implementation (to raise a |
+<tt class="xref docutils literal"><span class="pre">TypeError</span></tt>).</p> |
+<p>For example, to support arbitrary iterators, you could implement default |
+like this:</p> |
+<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">,</span> <span class="n">o</span><span class="p">):</span> |
+ <span class="k">try</span><span class="p">:</span> |
+ <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">)</span> |
+ <span class="k">except</span> <span class="ne">TypeError</span><span class="p">:</span> |
+ <span class="k">pass</span> |
+ <span class="k">else</span><span class="p">:</span> |
+ <span class="k">return</span> <span class="nb">list</span><span class="p">(</span><span class="n">iterable</span><span class="p">)</span> |
+ <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> |
+</pre></div> |
+</dd></dl> |
+ |
+<dl class="method"> |
+<dt id="simplejson.JSONEncoder.encode"> |
+<!--[simplejson.JSONEncoder.encode]--><tt class="descname">encode</tt><big>(</big><em>o</em><big>)</big><a class="headerlink" href="#simplejson.JSONEncoder.encode" title="Permalink to this definition">¶</a></dt> |
+<dd><p>Return a JSON string representation of a Python data structure, <em>o</em>. For |
+example:</p> |
+<div class="highlight"><pre><span class="gp">>>> </span><span class="k">import</span> <span class="nn">simplejson</span> <span class="k">as</span> <span class="nn">json</span> |
+<span class="gp">>>> </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">"foo"</span><span class="p">:</span> <span class="p">[</span><span class="s">"bar"</span><span class="p">,</span> <span class="s">"baz"</span><span class="p">]})</span> |
+<span class="go">'{"foo": ["bar", "baz"]}'</span> |
+</pre></div> |
+</dd></dl> |
+ |
+<dl class="method"> |
+<dt id="simplejson.JSONEncoder.iterencode"> |
+<!--[simplejson.JSONEncoder.iterencode]--><tt class="descname">iterencode</tt><big>(</big><em>o</em><big>)</big><a class="headerlink" href="#simplejson.JSONEncoder.iterencode" title="Permalink to this definition">¶</a></dt> |
+<dd><p>Encode the given object, <em>o</em>, and yield each string representation as |
+available. For example:</p> |
+<div class="highlight"><pre><span class="k">for</span> <span class="n">chunk</span> <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> |
+ <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">)</span> |
+</pre></div> |
+<p>Note that <a title="simplejson.JSONEncoder.encode" class="reference internal" href="#simplejson.JSONEncoder.encode"><tt class="xref docutils literal"><span class="pre">encode()</span></tt></a> has much better performance than |
+<a title="simplejson.JSONEncoder.iterencode" class="reference internal" href="#simplejson.JSONEncoder.iterencode"><tt class="xref docutils literal"><span class="pre">iterencode()</span></tt></a>.</p> |
+</dd></dl> |
+ |
+</dd></dl> |
+ |
+</div> |
+</div> |
+ |
+ |
+ </div> |
+ </div> |
+ </div> |
+ <div class="sphinxsidebar"> |
+ <div class="sphinxsidebarwrapper"> |
+ <h3>Table Of Contents</h3> |
+ <ul> |
+<li><a class="reference external" href=""><tt class="docutils literal"><span class="pre">simplejson</span></tt> — JSON encoder and decoder</a><ul> |
+<li><a class="reference external" href="#basic-usage">Basic Usage</a></li> |
+<li><a class="reference external" href="#encoders-and-decoders">Encoders and decoders</a></li> |
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