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<div class="section" id="module-apache_beam.dataframe.transforms">
<span id="apache-beam-dataframe-transforms-module"></span><h1>apache_beam.dataframe.transforms module<a class="headerlink" href="#module-apache_beam.dataframe.transforms" title="Permalink to this headline"></a></h1>
<dl class="class">
<dt id="apache_beam.dataframe.transforms.DataframeTransform">
<em class="property">class </em><code class="descclassname">apache_beam.dataframe.transforms.</code><code class="descname">DataframeTransform</code><span class="sig-paren">(</span><em>func</em>, <em>proxy</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/dataframe/transforms.html#DataframeTransform"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.dataframe.transforms.DataframeTransform" title="Permalink to this definition"></a></dt>
<dd><p>Bases: <a class="reference internal" href="apache_beam.transforms.ptransform.html#apache_beam.transforms.ptransform.PTransform" title="apache_beam.transforms.ptransform.PTransform"><code class="xref py py-class docutils literal notranslate"><span class="pre">apache_beam.transforms.ptransform.PTransform</span></code></a></p>
<p>A PTransform for applying function that takes and returns dataframes
to one or more PCollections.</p>
<p>For example, if pcoll is a PCollection of dataframes, one could write:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">pcoll</span> <span class="o">|</span> <span class="n">DataframeTransform</span><span class="p">(</span><span class="k">lambda</span> <span class="n">df</span><span class="p">:</span> <span class="n">df</span><span class="o">.</span><span class="n">group_by</span><span class="p">(</span><span class="s1">&#39;key&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">sum</span><span class="p">(),</span> <span class="n">proxy</span><span class="o">=...</span><span class="p">)</span>
</pre></div>
</div>
<p>To pass multiple PCollections, pass a tuple of PCollections wich will be
passed to the callable as positional arguments, or a dictionary of
PCollections, in which case they will be passed as keyword arguments.</p>
<dl class="method">
<dt id="apache_beam.dataframe.transforms.DataframeTransform.expand">
<code class="descname">expand</code><span class="sig-paren">(</span><em>input_pcolls</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/dataframe/transforms.html#DataframeTransform.expand"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.dataframe.transforms.DataframeTransform.expand" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
</dd></dl>
<dl class="function">
<dt id="apache_beam.dataframe.transforms.memoize">
<code class="descclassname">apache_beam.dataframe.transforms.</code><code class="descname">memoize</code><span class="sig-paren">(</span><em>f</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/dataframe/transforms.html#memoize"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.dataframe.transforms.memoize" title="Permalink to this definition"></a></dt>
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