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<div class="section" id="module-apache_beam.typehints.typecheck">
<span id="apache-beam-typehints-typecheck-module"></span><h1>apache_beam.typehints.typecheck module<a class="headerlink" href="#module-apache_beam.typehints.typecheck" title="Permalink to this headline"></a></h1>
<p>Runtime type checking support.</p>
<p>For internal use only; no backwards-compatibility guarantees.</p>
<dl class="class">
<dt id="apache_beam.typehints.typecheck.AbstractDoFnWrapper">
<em class="property">class </em><code class="descclassname">apache_beam.typehints.typecheck.</code><code class="descname">AbstractDoFnWrapper</code><span class="sig-paren">(</span><em>dofn</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#AbstractDoFnWrapper"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.AbstractDoFnWrapper" title="Permalink to this definition"></a></dt>
<dd><p>Bases: <a class="reference internal" href="apache_beam.transforms.core.html#apache_beam.transforms.core.DoFn" title="apache_beam.transforms.core.DoFn"><code class="xref py py-class docutils literal notranslate"><span class="pre">apache_beam.transforms.core.DoFn</span></code></a></p>
<p>An abstract class to create wrapper around DoFn</p>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.AbstractDoFnWrapper.wrapper">
<code class="descname">wrapper</code><span class="sig-paren">(</span><em>method</em>, <em>args</em>, <em>kwargs</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#AbstractDoFnWrapper.wrapper"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.AbstractDoFnWrapper.wrapper" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.AbstractDoFnWrapper.setup">
<code class="descname">setup</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#AbstractDoFnWrapper.setup"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.AbstractDoFnWrapper.setup" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.AbstractDoFnWrapper.start_bundle">
<code class="descname">start_bundle</code><span class="sig-paren">(</span><em>*args</em>, <em>**kwargs</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#AbstractDoFnWrapper.start_bundle"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.AbstractDoFnWrapper.start_bundle" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.AbstractDoFnWrapper.process">
<code class="descname">process</code><span class="sig-paren">(</span><em>*args</em>, <em>**kwargs</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#AbstractDoFnWrapper.process"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.AbstractDoFnWrapper.process" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.AbstractDoFnWrapper.finish_bundle">
<code class="descname">finish_bundle</code><span class="sig-paren">(</span><em>*args</em>, <em>**kwargs</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#AbstractDoFnWrapper.finish_bundle"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.AbstractDoFnWrapper.finish_bundle" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.AbstractDoFnWrapper.teardown">
<code class="descname">teardown</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#AbstractDoFnWrapper.teardown"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.AbstractDoFnWrapper.teardown" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
</dd></dl>
<dl class="class">
<dt id="apache_beam.typehints.typecheck.OutputCheckWrapperDoFn">
<em class="property">class </em><code class="descclassname">apache_beam.typehints.typecheck.</code><code class="descname">OutputCheckWrapperDoFn</code><span class="sig-paren">(</span><em>dofn</em>, <em>full_label</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#OutputCheckWrapperDoFn"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.OutputCheckWrapperDoFn" title="Permalink to this definition"></a></dt>
<dd><p>Bases: <a class="reference internal" href="#apache_beam.typehints.typecheck.AbstractDoFnWrapper" title="apache_beam.typehints.typecheck.AbstractDoFnWrapper"><code class="xref py py-class docutils literal notranslate"><span class="pre">apache_beam.typehints.typecheck.AbstractDoFnWrapper</span></code></a></p>
<p>A DoFn that verifies against common errors in the output type.</p>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.OutputCheckWrapperDoFn.wrapper">
<code class="descname">wrapper</code><span class="sig-paren">(</span><em>method</em>, <em>args</em>, <em>kwargs</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#OutputCheckWrapperDoFn.wrapper"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.OutputCheckWrapperDoFn.wrapper" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
</dd></dl>
<dl class="class">
<dt id="apache_beam.typehints.typecheck.TypeCheckWrapperDoFn">
<em class="property">class </em><code class="descclassname">apache_beam.typehints.typecheck.</code><code class="descname">TypeCheckWrapperDoFn</code><span class="sig-paren">(</span><em>dofn</em>, <em>type_hints</em>, <em>label=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#TypeCheckWrapperDoFn"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.TypeCheckWrapperDoFn" title="Permalink to this definition"></a></dt>
<dd><p>Bases: <a class="reference internal" href="#apache_beam.typehints.typecheck.AbstractDoFnWrapper" title="apache_beam.typehints.typecheck.AbstractDoFnWrapper"><code class="xref py py-class docutils literal notranslate"><span class="pre">apache_beam.typehints.typecheck.AbstractDoFnWrapper</span></code></a></p>
<p>A wrapper around a DoFn which performs type-checking of input and output.</p>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.TypeCheckWrapperDoFn.wrapper">
<code class="descname">wrapper</code><span class="sig-paren">(</span><em>method</em>, <em>args</em>, <em>kwargs</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#TypeCheckWrapperDoFn.wrapper"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.TypeCheckWrapperDoFn.wrapper" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.TypeCheckWrapperDoFn.process">
<code class="descname">process</code><span class="sig-paren">(</span><em>*args</em>, <em>**kwargs</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#TypeCheckWrapperDoFn.process"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.TypeCheckWrapperDoFn.process" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="staticmethod">
<dt id="apache_beam.typehints.typecheck.TypeCheckWrapperDoFn.type_check">
<em class="property">static </em><code class="descname">type_check</code><span class="sig-paren">(</span><em>type_constraint</em>, <em>datum</em>, <em>is_input</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#TypeCheckWrapperDoFn.type_check"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.TypeCheckWrapperDoFn.type_check" title="Permalink to this definition"></a></dt>
<dd><p>Typecheck a PTransform related datum according to a type constraint.</p>
<p>This function is used to optionally type-check either an input or an output
to a PTransform.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>type_constraint</strong> – An instance of a typehints.TypeContraint, one of the
white-listed builtin Python types, or a custom user class.</li>
<li><strong>datum</strong> – An instance of a Python object.</li>
<li><strong>is_input</strong> – True if ‘datum’ is an input to a PTransform’s DoFn. False
otherwise.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Raises:</th><td class="field-body"><p class="first last"><a class="reference external" href="https://docs.python.org/3/library/exceptions.html#TypeError" title="(in Python v3.10)"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a> – If ‘datum’ fails to type-check according to ‘type_constraint’.</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="apache_beam.typehints.typecheck.TypeCheckCombineFn">
<em class="property">class </em><code class="descclassname">apache_beam.typehints.typecheck.</code><code class="descname">TypeCheckCombineFn</code><span class="sig-paren">(</span><em>combinefn</em>, <em>type_hints</em>, <em>label=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#TypeCheckCombineFn"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.TypeCheckCombineFn" title="Permalink to this definition"></a></dt>
<dd><p>Bases: <a class="reference internal" href="apache_beam.transforms.core.html#apache_beam.transforms.core.CombineFn" title="apache_beam.transforms.core.CombineFn"><code class="xref py py-class docutils literal notranslate"><span class="pre">apache_beam.transforms.core.CombineFn</span></code></a></p>
<p>A wrapper around a CombineFn performing type-checking of input and output.</p>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.TypeCheckCombineFn.setup">
<code class="descname">setup</code><span class="sig-paren">(</span><em>*args</em>, <em>**kwargs</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#TypeCheckCombineFn.setup"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.TypeCheckCombineFn.setup" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.TypeCheckCombineFn.create_accumulator">
<code class="descname">create_accumulator</code><span class="sig-paren">(</span><em>*args</em>, <em>**kwargs</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#TypeCheckCombineFn.create_accumulator"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.TypeCheckCombineFn.create_accumulator" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.TypeCheckCombineFn.add_input">
<code class="descname">add_input</code><span class="sig-paren">(</span><em>accumulator</em>, <em>element</em>, <em>*args</em>, <em>**kwargs</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#TypeCheckCombineFn.add_input"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.TypeCheckCombineFn.add_input" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.TypeCheckCombineFn.merge_accumulators">
<code class="descname">merge_accumulators</code><span class="sig-paren">(</span><em>accumulators</em>, <em>*args</em>, <em>**kwargs</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#TypeCheckCombineFn.merge_accumulators"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.TypeCheckCombineFn.merge_accumulators" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.TypeCheckCombineFn.compact">
<code class="descname">compact</code><span class="sig-paren">(</span><em>accumulator</em>, <em>*args</em>, <em>**kwargs</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#TypeCheckCombineFn.compact"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.TypeCheckCombineFn.compact" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.TypeCheckCombineFn.extract_output">
<code class="descname">extract_output</code><span class="sig-paren">(</span><em>accumulator</em>, <em>*args</em>, <em>**kwargs</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#TypeCheckCombineFn.extract_output"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.TypeCheckCombineFn.extract_output" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.TypeCheckCombineFn.teardown">
<code class="descname">teardown</code><span class="sig-paren">(</span><em>*args</em>, <em>**kwargs</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#TypeCheckCombineFn.teardown"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.TypeCheckCombineFn.teardown" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
</dd></dl>
<dl class="class">
<dt id="apache_beam.typehints.typecheck.TypeCheckVisitor">
<em class="property">class </em><code class="descclassname">apache_beam.typehints.typecheck.</code><code class="descname">TypeCheckVisitor</code><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#TypeCheckVisitor"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.TypeCheckVisitor" title="Permalink to this definition"></a></dt>
<dd><p>Bases: <code class="xref py py-class docutils literal notranslate"><span class="pre">apache_beam.pipeline.PipelineVisitor</span></code></p>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.TypeCheckVisitor.enter_composite_transform">
<code class="descname">enter_composite_transform</code><span class="sig-paren">(</span><em>applied_transform</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#TypeCheckVisitor.enter_composite_transform"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.TypeCheckVisitor.enter_composite_transform" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.TypeCheckVisitor.leave_composite_transform">
<code class="descname">leave_composite_transform</code><span class="sig-paren">(</span><em>applied_transform</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#TypeCheckVisitor.leave_composite_transform"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.TypeCheckVisitor.leave_composite_transform" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.TypeCheckVisitor.visit_transform">
<code class="descname">visit_transform</code><span class="sig-paren">(</span><em>applied_transform</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#TypeCheckVisitor.visit_transform"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.TypeCheckVisitor.visit_transform" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
</dd></dl>
<dl class="class">
<dt id="apache_beam.typehints.typecheck.PerformanceTypeCheckVisitor">
<em class="property">class </em><code class="descclassname">apache_beam.typehints.typecheck.</code><code class="descname">PerformanceTypeCheckVisitor</code><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#PerformanceTypeCheckVisitor"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.PerformanceTypeCheckVisitor" title="Permalink to this definition"></a></dt>
<dd><p>Bases: <code class="xref py py-class docutils literal notranslate"><span class="pre">apache_beam.pipeline.PipelineVisitor</span></code></p>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.PerformanceTypeCheckVisitor.visit_transform">
<code class="descname">visit_transform</code><span class="sig-paren">(</span><em>applied_transform</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#PerformanceTypeCheckVisitor.visit_transform"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.PerformanceTypeCheckVisitor.visit_transform" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.PerformanceTypeCheckVisitor.get_input_type_hints">
<code class="descname">get_input_type_hints</code><span class="sig-paren">(</span><em>transform</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#PerformanceTypeCheckVisitor.get_input_type_hints"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.PerformanceTypeCheckVisitor.get_input_type_hints" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.typehints.typecheck.PerformanceTypeCheckVisitor.get_output_type_hints">
<code class="descname">get_output_type_hints</code><span class="sig-paren">(</span><em>transform</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/typecheck.html#PerformanceTypeCheckVisitor.get_output_type_hints"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.typecheck.PerformanceTypeCheckVisitor.get_output_type_hints" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
</dd></dl>
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