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| <section id="pyarrow-dictionarytype"> |
| <h1>pyarrow.DictionaryType<a class="headerlink" href="#pyarrow-dictionarytype" title="Permalink to this heading">#</a></h1> |
| <dl class="py class"> |
| <dt class="sig sig-object py" id="pyarrow.DictionaryType"> |
| <em class="property"><span class="pre">class</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">pyarrow.</span></span><span class="sig-name descname"><span class="pre">DictionaryType</span></span><a class="headerlink" href="#pyarrow.DictionaryType" title="Permalink to this definition">#</a></dt> |
| <dd><p>Bases: <a class="reference internal" href="pyarrow.DataType.html#pyarrow.DataType" title="pyarrow.lib.DataType"><code class="xref py py-class docutils literal notranslate"><span class="pre">DataType</span></code></a></p> |
| <p>Concrete class for dictionary data types.</p> |
| <p class="rubric">Examples</p> |
| <p>Create an instance of dictionary type:</p> |
| <div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">pyarrow</span> <span class="k">as</span> <span class="nn">pa</span> |
| <span class="gp">>>> </span><span class="n">pa</span><span class="o">.</span><span class="n">dictionary</span><span class="p">(</span><span class="n">pa</span><span class="o">.</span><span class="n">int64</span><span class="p">(),</span> <span class="n">pa</span><span class="o">.</span><span class="n">utf8</span><span class="p">())</span> |
| <span class="go">DictionaryType(dictionary<values=string, indices=int64, ordered=0>)</span> |
| </pre></div> |
| </div> |
| <dl class="py method"> |
| <dt class="sig sig-object py" id="pyarrow.DictionaryType.__init__"> |
| <span class="sig-name descname"><span class="pre">__init__</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="o"><span class="pre">*</span></span><span class="n"><span class="pre">args</span></span></em>, <em class="sig-param"><span class="o"><span class="pre">**</span></span><span class="n"><span class="pre">kwargs</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pyarrow.DictionaryType.__init__" title="Permalink to this definition">#</a></dt> |
| <dd></dd></dl> |
| |
| <p class="rubric">Methods</p> |
| <table class="autosummary longtable table autosummary"> |
| <tbody> |
| <tr class="row-odd"><td><p><a class="reference internal" href="#pyarrow.DictionaryType.__init__" title="pyarrow.DictionaryType.__init__"><code class="xref py py-obj docutils literal notranslate"><span class="pre">__init__</span></code></a>(*args, **kwargs)</p></td> |
| <td><p></p></td> |
| </tr> |
| <tr class="row-even"><td><p><a class="reference internal" href="#pyarrow.DictionaryType.equals" title="pyarrow.DictionaryType.equals"><code class="xref py py-obj docutils literal notranslate"><span class="pre">equals</span></code></a>(self, other, *[, check_metadata])</p></td> |
| <td><p>Return true if type is equivalent to passed value.</p></td> |
| </tr> |
| <tr class="row-odd"><td><p><a class="reference internal" href="#pyarrow.DictionaryType.field" title="pyarrow.DictionaryType.field"><code class="xref py py-obj docutils literal notranslate"><span class="pre">field</span></code></a>(self, i)</p></td> |
| <td><p><dl class="field-list simple"> |
| <dt class="field-odd">Parameters<span class="colon">:</span></dt> |
| <dd class="field-odd"><p></p></dd> |
| </dl> |
| </p></td> |
| </tr> |
| <tr class="row-even"><td><p><a class="reference internal" href="#pyarrow.DictionaryType.to_pandas_dtype" title="pyarrow.DictionaryType.to_pandas_dtype"><code class="xref py py-obj docutils literal notranslate"><span class="pre">to_pandas_dtype</span></code></a>(self)</p></td> |
| <td><p>Return the equivalent NumPy / Pandas dtype.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <p class="rubric">Attributes</p> |
| <table class="autosummary longtable table autosummary"> |
| <tbody> |
| <tr class="row-odd"><td><p><a class="reference internal" href="#pyarrow.DictionaryType.bit_width" title="pyarrow.DictionaryType.bit_width"><code class="xref py py-obj docutils literal notranslate"><span class="pre">bit_width</span></code></a></p></td> |
| <td><p>Bit width for fixed width type.</p></td> |
| </tr> |
| <tr class="row-even"><td><p><a class="reference internal" href="#pyarrow.DictionaryType.byte_width" title="pyarrow.DictionaryType.byte_width"><code class="xref py py-obj docutils literal notranslate"><span class="pre">byte_width</span></code></a></p></td> |
| <td><p>Byte width for fixed width type.</p></td> |
| </tr> |
| <tr class="row-odd"><td><p><a class="reference internal" href="#pyarrow.DictionaryType.id" title="pyarrow.DictionaryType.id"><code class="xref py py-obj docutils literal notranslate"><span class="pre">id</span></code></a></p></td> |
| <td><p></p></td> |
| </tr> |
| <tr class="row-even"><td><p><a class="reference internal" href="#pyarrow.DictionaryType.index_type" title="pyarrow.DictionaryType.index_type"><code class="xref py py-obj docutils literal notranslate"><span class="pre">index_type</span></code></a></p></td> |
| <td><p>The data type of dictionary indices (a signed integer type).</p></td> |
| </tr> |
| <tr class="row-odd"><td><p><a class="reference internal" href="#pyarrow.DictionaryType.num_buffers" title="pyarrow.DictionaryType.num_buffers"><code class="xref py py-obj docutils literal notranslate"><span class="pre">num_buffers</span></code></a></p></td> |
| <td><p>Number of data buffers required to construct Array type excluding children.</p></td> |
| </tr> |
| <tr class="row-even"><td><p><a class="reference internal" href="#pyarrow.DictionaryType.num_fields" title="pyarrow.DictionaryType.num_fields"><code class="xref py py-obj docutils literal notranslate"><span class="pre">num_fields</span></code></a></p></td> |
| <td><p>The number of child fields.</p></td> |
| </tr> |
| <tr class="row-odd"><td><p><a class="reference internal" href="#pyarrow.DictionaryType.ordered" title="pyarrow.DictionaryType.ordered"><code class="xref py py-obj docutils literal notranslate"><span class="pre">ordered</span></code></a></p></td> |
| <td><p>Whether the dictionary is ordered, i.e. whether the ordering of values in the dictionary is important.</p></td> |
| </tr> |
| <tr class="row-even"><td><p><a class="reference internal" href="#pyarrow.DictionaryType.value_type" title="pyarrow.DictionaryType.value_type"><code class="xref py py-obj docutils literal notranslate"><span class="pre">value_type</span></code></a></p></td> |
| <td><p>The dictionary value type.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <dl class="py attribute"> |
| <dt class="sig sig-object py" id="pyarrow.DictionaryType.bit_width"> |
| <span class="sig-name descname"><span class="pre">bit_width</span></span><a class="headerlink" href="#pyarrow.DictionaryType.bit_width" title="Permalink to this definition">#</a></dt> |
| <dd><p>Bit width for fixed width type.</p> |
| <p class="rubric">Examples</p> |
| <div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">pyarrow</span> <span class="k">as</span> <span class="nn">pa</span> |
| <span class="gp">>>> </span><span class="n">pa</span><span class="o">.</span><span class="n">int64</span><span class="p">()</span> |
| <span class="go">DataType(int64)</span> |
| <span class="gp">>>> </span><span class="n">pa</span><span class="o">.</span><span class="n">int64</span><span class="p">()</span><span class="o">.</span><span class="n">bit_width</span> |
| <span class="go">64</span> |
| </pre></div> |
| </div> |
| </dd></dl> |
| |
| <dl class="py attribute"> |
| <dt class="sig sig-object py" id="pyarrow.DictionaryType.byte_width"> |
| <span class="sig-name descname"><span class="pre">byte_width</span></span><a class="headerlink" href="#pyarrow.DictionaryType.byte_width" title="Permalink to this definition">#</a></dt> |
| <dd><p>Byte width for fixed width type.</p> |
| <p class="rubric">Examples</p> |
| <div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">pyarrow</span> <span class="k">as</span> <span class="nn">pa</span> |
| <span class="gp">>>> </span><span class="n">pa</span><span class="o">.</span><span class="n">int64</span><span class="p">()</span> |
| <span class="go">DataType(int64)</span> |
| <span class="gp">>>> </span><span class="n">pa</span><span class="o">.</span><span class="n">int64</span><span class="p">()</span><span class="o">.</span><span class="n">byte_width</span> |
| <span class="go">8</span> |
| </pre></div> |
| </div> |
| </dd></dl> |
| |
| <dl class="py method"> |
| <dt class="sig sig-object py" id="pyarrow.DictionaryType.equals"> |
| <span class="sig-name descname"><span class="pre">equals</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">self</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">other</span></span></em>, <em class="sig-param"><span class="o"><span class="pre">*</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">check_metadata</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">False</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pyarrow.DictionaryType.equals" title="Permalink to this definition">#</a></dt> |
| <dd><p>Return true if type is equivalent to passed value.</p> |
| <dl class="field-list"> |
| <dt class="field-odd">Parameters<span class="colon">:</span></dt> |
| <dd class="field-odd"><dl> |
| <dt><strong>other</strong><span class="classifier"><a class="reference internal" href="pyarrow.DataType.html#pyarrow.DataType" title="pyarrow.DataType"><code class="xref py py-obj docutils literal notranslate"><span class="pre">DataType</span></code></a> or <a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.12)"><code class="docutils literal notranslate"><span class="pre">str</span></code></a> <code class="xref py py-obj docutils literal notranslate"><span class="pre">convertible</span></code> to <a class="reference internal" href="pyarrow.DataType.html#pyarrow.DataType" title="pyarrow.DataType"><code class="xref py py-obj docutils literal notranslate"><span class="pre">DataType</span></code></a></span></dt><dd></dd> |
| <dt><strong>check_metadata</strong><span class="classifier"><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#bltin-boolean-values" title="(in Python v3.12)"><span class="xref std std-ref">bool</span></a></span></dt><dd><p>Whether nested Field metadata equality should be checked as well.</p> |
| </dd> |
| </dl> |
| </dd> |
| <dt class="field-even">Returns<span class="colon">:</span></dt> |
| <dd class="field-even"><dl> |
| <dt><strong>is_equal</strong><span class="classifier"><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#bltin-boolean-values" title="(in Python v3.12)"><span class="xref std std-ref">bool</span></a></span></dt><dd></dd> |
| </dl> |
| </dd> |
| </dl> |
| <p class="rubric">Examples</p> |
| <div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">pyarrow</span> <span class="k">as</span> <span class="nn">pa</span> |
| <span class="gp">>>> </span><span class="n">pa</span><span class="o">.</span><span class="n">int64</span><span class="p">()</span><span class="o">.</span><span class="n">equals</span><span class="p">(</span><span class="n">pa</span><span class="o">.</span><span class="n">string</span><span class="p">())</span> |
| <span class="go">False</span> |
| <span class="gp">>>> </span><span class="n">pa</span><span class="o">.</span><span class="n">int64</span><span class="p">()</span><span class="o">.</span><span class="n">equals</span><span class="p">(</span><span class="n">pa</span><span class="o">.</span><span class="n">int64</span><span class="p">())</span> |
| <span class="go">True</span> |
| </pre></div> |
| </div> |
| </dd></dl> |
| |
| <dl class="py method"> |
| <dt class="sig sig-object py" id="pyarrow.DictionaryType.field"> |
| <span class="sig-name descname"><span class="pre">field</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">self</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">i</span></span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">→</span> <span class="sig-return-typehint"><a class="reference internal" href="pyarrow.Field.html#pyarrow.Field" title="pyarrow.Field"><span class="pre">Field</span></a></span></span><a class="headerlink" href="#pyarrow.DictionaryType.field" title="Permalink to this definition">#</a></dt> |
| <dd><dl class="field-list"> |
| <dt class="field-odd">Parameters<span class="colon">:</span></dt> |
| <dd class="field-odd"><dl> |
| <dt><strong>i</strong><span class="classifier"><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.12)"><code class="docutils literal notranslate"><span class="pre">int</span></code></a></span></dt><dd></dd> |
| </dl> |
| </dd> |
| <dt class="field-even">Returns<span class="colon">:</span></dt> |
| <dd class="field-even"><dl class="simple"> |
| <dt><a class="reference internal" href="pyarrow.Field.html#pyarrow.Field" title="pyarrow.Field"><code class="xref py py-obj docutils literal notranslate"><span class="pre">pyarrow.Field</span></code></a></dt><dd></dd> |
| </dl> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| <dl class="py attribute"> |
| <dt class="sig sig-object py" id="pyarrow.DictionaryType.id"> |
| <span class="sig-name descname"><span class="pre">id</span></span><a class="headerlink" href="#pyarrow.DictionaryType.id" title="Permalink to this definition">#</a></dt> |
| <dd></dd></dl> |
| |
| <dl class="py attribute"> |
| <dt class="sig sig-object py" id="pyarrow.DictionaryType.index_type"> |
| <span class="sig-name descname"><span class="pre">index_type</span></span><a class="headerlink" href="#pyarrow.DictionaryType.index_type" title="Permalink to this definition">#</a></dt> |
| <dd><p>The data type of dictionary indices (a signed integer type).</p> |
| <p class="rubric">Examples</p> |
| <div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">pyarrow</span> <span class="k">as</span> <span class="nn">pa</span> |
| <span class="gp">>>> </span><span class="n">pa</span><span class="o">.</span><span class="n">dictionary</span><span class="p">(</span><span class="n">pa</span><span class="o">.</span><span class="n">int16</span><span class="p">(),</span> <span class="n">pa</span><span class="o">.</span><span class="n">utf8</span><span class="p">())</span><span class="o">.</span><span class="n">index_type</span> |
| <span class="go">DataType(int16)</span> |
| </pre></div> |
| </div> |
| </dd></dl> |
| |
| <dl class="py attribute"> |
| <dt class="sig sig-object py" id="pyarrow.DictionaryType.num_buffers"> |
| <span class="sig-name descname"><span class="pre">num_buffers</span></span><a class="headerlink" href="#pyarrow.DictionaryType.num_buffers" title="Permalink to this definition">#</a></dt> |
| <dd><p>Number of data buffers required to construct Array type |
| excluding children.</p> |
| <p class="rubric">Examples</p> |
| <div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">pyarrow</span> <span class="k">as</span> <span class="nn">pa</span> |
| <span class="gp">>>> </span><span class="n">pa</span><span class="o">.</span><span class="n">int64</span><span class="p">()</span><span class="o">.</span><span class="n">num_buffers</span> |
| <span class="go">2</span> |
| <span class="gp">>>> </span><span class="n">pa</span><span class="o">.</span><span class="n">string</span><span class="p">()</span><span class="o">.</span><span class="n">num_buffers</span> |
| <span class="go">3</span> |
| </pre></div> |
| </div> |
| </dd></dl> |
| |
| <dl class="py attribute"> |
| <dt class="sig sig-object py" id="pyarrow.DictionaryType.num_fields"> |
| <span class="sig-name descname"><span class="pre">num_fields</span></span><a class="headerlink" href="#pyarrow.DictionaryType.num_fields" title="Permalink to this definition">#</a></dt> |
| <dd><p>The number of child fields.</p> |
| <p class="rubric">Examples</p> |
| <div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">pyarrow</span> <span class="k">as</span> <span class="nn">pa</span> |
| <span class="gp">>>> </span><span class="n">pa</span><span class="o">.</span><span class="n">int64</span><span class="p">()</span> |
| <span class="go">DataType(int64)</span> |
| <span class="gp">>>> </span><span class="n">pa</span><span class="o">.</span><span class="n">int64</span><span class="p">()</span><span class="o">.</span><span class="n">num_fields</span> |
| <span class="go">0</span> |
| <span class="gp">>>> </span><span class="n">pa</span><span class="o">.</span><span class="n">list_</span><span class="p">(</span><span class="n">pa</span><span class="o">.</span><span class="n">string</span><span class="p">())</span> |
| <span class="go">ListType(list<item: string>)</span> |
| <span class="gp">>>> </span><span class="n">pa</span><span class="o">.</span><span class="n">list_</span><span class="p">(</span><span class="n">pa</span><span class="o">.</span><span class="n">string</span><span class="p">())</span><span class="o">.</span><span class="n">num_fields</span> |
| <span class="go">1</span> |
| <span class="gp">>>> </span><span class="n">struct</span> <span class="o">=</span> <span class="n">pa</span><span class="o">.</span><span class="n">struct</span><span class="p">({</span><span class="s1">'x'</span><span class="p">:</span> <span class="n">pa</span><span class="o">.</span><span class="n">int32</span><span class="p">(),</span> <span class="s1">'y'</span><span class="p">:</span> <span class="n">pa</span><span class="o">.</span><span class="n">string</span><span class="p">()})</span> |
| <span class="gp">>>> </span><span class="n">struct</span><span class="o">.</span><span class="n">num_fields</span> |
| <span class="go">2</span> |
| </pre></div> |
| </div> |
| </dd></dl> |
| |
| <dl class="py attribute"> |
| <dt class="sig sig-object py" id="pyarrow.DictionaryType.ordered"> |
| <span class="sig-name descname"><span class="pre">ordered</span></span><a class="headerlink" href="#pyarrow.DictionaryType.ordered" title="Permalink to this definition">#</a></dt> |
| <dd><p>Whether the dictionary is ordered, i.e. whether the ordering of values |
| in the dictionary is important.</p> |
| <p class="rubric">Examples</p> |
| <div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">pyarrow</span> <span class="k">as</span> <span class="nn">pa</span> |
| <span class="gp">>>> </span><span class="n">pa</span><span class="o">.</span><span class="n">dictionary</span><span class="p">(</span><span class="n">pa</span><span class="o">.</span><span class="n">int64</span><span class="p">(),</span> <span class="n">pa</span><span class="o">.</span><span class="n">utf8</span><span class="p">())</span><span class="o">.</span><span class="n">ordered</span> |
| <span class="go">False</span> |
| </pre></div> |
| </div> |
| </dd></dl> |
| |
| <dl class="py method"> |
| <dt class="sig sig-object py" id="pyarrow.DictionaryType.to_pandas_dtype"> |
| <span class="sig-name descname"><span class="pre">to_pandas_dtype</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">self</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pyarrow.DictionaryType.to_pandas_dtype" title="Permalink to this definition">#</a></dt> |
| <dd><p>Return the equivalent NumPy / Pandas dtype.</p> |
| <p class="rubric">Examples</p> |
| <div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">pyarrow</span> <span class="k">as</span> <span class="nn">pa</span> |
| <span class="gp">>>> </span><span class="n">pa</span><span class="o">.</span><span class="n">int64</span><span class="p">()</span><span class="o">.</span><span class="n">to_pandas_dtype</span><span class="p">()</span> |
| <span class="go"><class 'numpy.int64'></span> |
| </pre></div> |
| </div> |
| </dd></dl> |
| |
| <dl class="py attribute"> |
| <dt class="sig sig-object py" id="pyarrow.DictionaryType.value_type"> |
| <span class="sig-name descname"><span class="pre">value_type</span></span><a class="headerlink" href="#pyarrow.DictionaryType.value_type" title="Permalink to this definition">#</a></dt> |
| <dd><p>The dictionary value type.</p> |
| <p>The dictionary values are found in an instance of DictionaryArray.</p> |
| <p class="rubric">Examples</p> |
| <div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">pyarrow</span> <span class="k">as</span> <span class="nn">pa</span> |
| <span class="gp">>>> </span><span class="n">pa</span><span class="o">.</span><span class="n">dictionary</span><span class="p">(</span><span class="n">pa</span><span class="o">.</span><span class="n">int16</span><span class="p">(),</span> <span class="n">pa</span><span class="o">.</span><span class="n">utf8</span><span class="p">())</span><span class="o">.</span><span class="n">value_type</span> |
| <span class="go">DataType(string)</span> |
| </pre></div> |
| </div> |
| </dd></dl> |
| |
| </dd></dl> |
| |
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