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<div class="section" id="module-apache_beam.typehints.trivial_inference">
<span id="apache-beam-typehints-trivial-inference-module"></span><h1>apache_beam.typehints.trivial_inference module<a class="headerlink" href="#module-apache_beam.typehints.trivial_inference" title="Permalink to this headline"></a></h1>
<p>Trivial type inference for simple functions.</p>
<p>For internal use only; no backwards-compatibility guarantees.</p>
<dl class="exception">
<dt id="apache_beam.typehints.trivial_inference.TypeInferenceError">
<em class="property">exception </em><code class="descclassname">apache_beam.typehints.trivial_inference.</code><code class="descname">TypeInferenceError</code><a class="reference internal" href="_modules/apache_beam/typehints/trivial_inference.html#TypeInferenceError"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.trivial_inference.TypeInferenceError" title="Permalink to this definition"></a></dt>
<dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/exceptions.html#ValueError" title="(in Python v3.9)"><code class="xref py py-class docutils literal notranslate"><span class="pre">ValueError</span></code></a></p>
<p>Error to raise when type inference failed.</p>
</dd></dl>
<dl class="function">
<dt id="apache_beam.typehints.trivial_inference.instance_to_type">
<code class="descclassname">apache_beam.typehints.trivial_inference.</code><code class="descname">instance_to_type</code><span class="sig-paren">(</span><em>o</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/trivial_inference.html#instance_to_type"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.trivial_inference.instance_to_type" title="Permalink to this definition"></a></dt>
<dd><p>Given a Python object o, return the corresponding type hint.</p>
</dd></dl>
<dl class="function">
<dt id="apache_beam.typehints.trivial_inference.union_list">
<code class="descclassname">apache_beam.typehints.trivial_inference.</code><code class="descname">union_list</code><span class="sig-paren">(</span><em>xs</em>, <em>ys</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/trivial_inference.html#union_list"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.trivial_inference.union_list" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="class">
<dt id="apache_beam.typehints.trivial_inference.Const">
<em class="property">class </em><code class="descclassname">apache_beam.typehints.trivial_inference.</code><code class="descname">Const</code><span class="sig-paren">(</span><em>value</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/trivial_inference.html#Const"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.trivial_inference.Const" title="Permalink to this definition"></a></dt>
<dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/functions.html#object" title="(in Python v3.9)"><code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></a></p>
<dl class="staticmethod">
<dt id="apache_beam.typehints.trivial_inference.Const.unwrap">
<em class="property">static </em><code class="descname">unwrap</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/trivial_inference.html#Const.unwrap"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.trivial_inference.Const.unwrap" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="staticmethod">
<dt id="apache_beam.typehints.trivial_inference.Const.unwrap_all">
<em class="property">static </em><code class="descname">unwrap_all</code><span class="sig-paren">(</span><em>xs</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/trivial_inference.html#Const.unwrap_all"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.trivial_inference.Const.unwrap_all" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
</dd></dl>
<dl class="class">
<dt id="apache_beam.typehints.trivial_inference.FrameState">
<em class="property">class </em><code class="descclassname">apache_beam.typehints.trivial_inference.</code><code class="descname">FrameState</code><span class="sig-paren">(</span><em>f</em>, <em>local_vars=None</em>, <em>stack=()</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/trivial_inference.html#FrameState"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.trivial_inference.FrameState" title="Permalink to this definition"></a></dt>
<dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/functions.html#object" title="(in Python v3.9)"><code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></a></p>
<p>Stores the state of the frame at a particular point of execution.</p>
<dl class="method">
<dt id="apache_beam.typehints.trivial_inference.FrameState.copy">
<code class="descname">copy</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/trivial_inference.html#FrameState.copy"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.trivial_inference.FrameState.copy" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.typehints.trivial_inference.FrameState.const_type">
<code class="descname">const_type</code><span class="sig-paren">(</span><em>i</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/trivial_inference.html#FrameState.const_type"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.trivial_inference.FrameState.const_type" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.typehints.trivial_inference.FrameState.get_closure">
<code class="descname">get_closure</code><span class="sig-paren">(</span><em>i</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/trivial_inference.html#FrameState.get_closure"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.trivial_inference.FrameState.get_closure" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.typehints.trivial_inference.FrameState.closure_type">
<code class="descname">closure_type</code><span class="sig-paren">(</span><em>i</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/trivial_inference.html#FrameState.closure_type"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.trivial_inference.FrameState.closure_type" title="Permalink to this definition"></a></dt>
<dd><p>Returns a TypeConstraint or Const.</p>
</dd></dl>
<dl class="method">
<dt id="apache_beam.typehints.trivial_inference.FrameState.get_global">
<code class="descname">get_global</code><span class="sig-paren">(</span><em>i</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/trivial_inference.html#FrameState.get_global"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.trivial_inference.FrameState.get_global" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="apache_beam.typehints.trivial_inference.FrameState.get_name">
<code class="descname">get_name</code><span class="sig-paren">(</span><em>i</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/trivial_inference.html#FrameState.get_name"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.trivial_inference.FrameState.get_name" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
</dd></dl>
<dl class="function">
<dt id="apache_beam.typehints.trivial_inference.union">
<code class="descclassname">apache_beam.typehints.trivial_inference.</code><code class="descname">union</code><span class="sig-paren">(</span><em>a</em>, <em>b</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/trivial_inference.html#union"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.trivial_inference.union" title="Permalink to this definition"></a></dt>
<dd><p>Returns the union of two types or Const values.</p>
</dd></dl>
<dl class="function">
<dt id="apache_beam.typehints.trivial_inference.finalize_hints">
<code class="descclassname">apache_beam.typehints.trivial_inference.</code><code class="descname">finalize_hints</code><span class="sig-paren">(</span><em>type_hint</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/trivial_inference.html#finalize_hints"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.trivial_inference.finalize_hints" title="Permalink to this definition"></a></dt>
<dd><p>Sets type hint for empty data structures to Any.</p>
</dd></dl>
<dl class="function">
<dt id="apache_beam.typehints.trivial_inference.element_type">
<code class="descclassname">apache_beam.typehints.trivial_inference.</code><code class="descname">element_type</code><span class="sig-paren">(</span><em>hint</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/trivial_inference.html#element_type"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.trivial_inference.element_type" title="Permalink to this definition"></a></dt>
<dd><p>Returns the element type of a composite type.</p>
</dd></dl>
<dl class="function">
<dt id="apache_beam.typehints.trivial_inference.key_value_types">
<code class="descclassname">apache_beam.typehints.trivial_inference.</code><code class="descname">key_value_types</code><span class="sig-paren">(</span><em>kv_type</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/trivial_inference.html#key_value_types"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.trivial_inference.key_value_types" title="Permalink to this definition"></a></dt>
<dd><p>Returns the key and value type of a KV type.</p>
</dd></dl>
<dl class="class">
<dt id="apache_beam.typehints.trivial_inference.BoundMethod">
<em class="property">class </em><code class="descclassname">apache_beam.typehints.trivial_inference.</code><code class="descname">BoundMethod</code><span class="sig-paren">(</span><em>func</em>, <em>type</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/trivial_inference.html#BoundMethod"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.trivial_inference.BoundMethod" title="Permalink to this definition"></a></dt>
<dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/functions.html#object" title="(in Python v3.9)"><code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></a></p>
<p>Used to create a bound method when we only know the type of the instance.</p>
<p>Instantiates a bound method object.</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 last simple">
<li><strong>func</strong> (<em>types.FunctionType</em>) – The method’s underlying function</li>
<li><strong>type</strong> (<a class="reference external" href="https://docs.python.org/3/library/functions.html#type" title="(in Python v3.9)"><em>type</em></a>) – The class of the method.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="apache_beam.typehints.trivial_inference.hashable">
<code class="descclassname">apache_beam.typehints.trivial_inference.</code><code class="descname">hashable</code><span class="sig-paren">(</span><em>c</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/trivial_inference.html#hashable"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.trivial_inference.hashable" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="function">
<dt id="apache_beam.typehints.trivial_inference.infer_return_type">
<code class="descclassname">apache_beam.typehints.trivial_inference.</code><code class="descname">infer_return_type</code><span class="sig-paren">(</span><em>c</em>, <em>input_types</em>, <em>debug=False</em>, <em>depth=5</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/trivial_inference.html#infer_return_type"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.trivial_inference.infer_return_type" title="Permalink to this definition"></a></dt>
<dd><p>Analyses a callable to deduce its return type.</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>c</strong> – A Python callable to infer the return type of.</li>
<li><strong>input_types</strong> – A sequence of inputs corresponding to the input types.</li>
<li><strong>debug</strong> – Whether to print verbose debugging information.</li>
<li><strong>depth</strong> – Maximum inspection depth during type inference.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">A TypeConstraint that that the return value of this function will (likely)
satisfy given the specified inputs.</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="apache_beam.typehints.trivial_inference.infer_return_type_func">
<code class="descclassname">apache_beam.typehints.trivial_inference.</code><code class="descname">infer_return_type_func</code><span class="sig-paren">(</span><em>f</em>, <em>input_types</em>, <em>debug=False</em>, <em>depth=0</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/typehints/trivial_inference.html#infer_return_type_func"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.typehints.trivial_inference.infer_return_type_func" title="Permalink to this definition"></a></dt>
<dd><p>Analyses a function to deduce its return type.</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>f</strong> – A Python function object to infer the return type of.</li>
<li><strong>input_types</strong> – A sequence of inputs corresponding to the input types.</li>
<li><strong>debug</strong> – Whether to print verbose debugging information.</li>
<li><strong>depth</strong> – Maximum inspection depth during type inference.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">A TypeConstraint that that the return value of this function will (likely)
satisfy given the specified inputs.</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Raises:</th><td class="field-body"><p class="first last"><a class="reference internal" href="#apache_beam.typehints.trivial_inference.TypeInferenceError" title="apache_beam.typehints.trivial_inference.TypeInferenceError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeInferenceError</span></code></a> – if no type can be inferred.</p>
</td>
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