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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Executes the provided closure with an embedded Python interpreter."><meta name="keywords" content="rust, rustlang, rust-lang, with_embedded_python_interpreter"><title>pyo3::with_embedded_python_interpreter - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../ayu.css" disabled ><script id="default-settings"></script><script src="../storage.js"></script><script src="../crates.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../favicon.svg">
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<a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" height="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Function <a href="index.html">pyo3</a>::<wbr><a class="fn" href="">with_embedded_python_interpreter</a></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span><a class="srclink" href="../src/pyo3/gil.rs.html#142-179" title="goto source code">[src]</a></span></h1><pre class="rust fn">pub unsafe fn with_embedded_python_interpreter<F, R>(f: F) -> R <span class="where fmt-newline">where<br> F: for<'p> <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="struct" href="../pyo3/prelude/struct.Python.html" title="struct pyo3::prelude::Python">Python</a><'p>) -> R, </span></pre><div class="docblock"><p>Executes the provided closure with an embedded Python interpreter.</p>
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<p>This function intializes the Python interpreter, executes the provided closure, and then
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finalizes the Python interpreter.</p>
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<p>After execution all Python resources are cleaned up, and no further Python APIs can be called.
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Because many Python modules implemented in C do not support multiple Python interpreters in a
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single process, it is not safe to call this function more than once. (Many such modules will not
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initialize correctly on the second run.)</p>
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<h1 id="availability" class="section-header"><a href="#availability">Availability</a></h1>
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<p>This function is only available when linking against Python distributions that contain a shared
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library.</p>
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<p>This function is not available on PyPy.</p>
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<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
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<ul>
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<li>If the Python interpreter is already initalized before calling this function.</li>
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</ul>
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<h1 id="safety" class="section-header"><a href="#safety">Safety</a></h1>
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<ul>
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<li>This function should only ever be called once per process (usually as part of the <code>main</code>
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function). It is also not thread-safe.</li>
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<li>No Python APIs can be used after this function has finished executing.</li>
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<li>The return value of the closure must not contain any Python value, <em>including</em> <code>PyResult</code>.</li>
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</ul>
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<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">pyo3</span>::<span class="ident">prelude</span>::<span class="kw-2">*</span>;
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<span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="kw">unsafe</span> {
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<span class="ident">pyo3</span>::<span class="ident">with_embedded_python_interpreter</span>(<span class="op">|</span><span class="ident">py</span><span class="op">|</span> {
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<span class="ident">py</span>.<span class="ident">run</span>(<span class="string">"print('Hello World')"</span>, <span class="prelude-val">None</span>, <span class="prelude-val">None</span>)
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});
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}
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}</pre></div>
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