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<!DOCTYPE html> <html lang="en"> <head> <title>setitem -- set elements of mutable python sequences</title> <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> <link type="text/css" rel="stylesheet" href="../../../../Macaulay2/Style/doc.css"> <link rel="stylesheet" href="../../../../Macaulay2/Style/katex/katex.min.css"> <script defer="defer" src="../../../../Macaulay2/Style/katex/katex.min.js"></script> <script defer="defer" src="../../../../Macaulay2/Style/katex/contrib/auto-render.min.js"></script> <script> var macros = { "\\break": "\\\\", "\\ZZ": "\\mathbb{Z}", "\\NN": "\\mathbb{N}", "\\QQ": "\\mathbb{Q}", "\\RR": "\\mathbb{R}", "\\CC": "\\mathbb{C}", "\\PP": "\\mathbb{P}" }, delimiters = [ { left: "$$", right: "$$", display: true}, { left: "\\[", right: "\\]", display: true}, { left: "$", right: "$", display: false}, { left: "\\(", right: "\\)", display: false} ], ignoredTags = [ "kbd", "var", "samp", "script", "noscript", "style", "textarea", "pre", "code", "option" ]; document.addEventListener("DOMContentLoaded", function() { renderMathInElement(document.body, { delimiters: delimiters, macros: macros, ignoredTags: ignoredTags, trust: true }); }); </script> <style>.katex { font-size: 1em; }</style> <script defer="defer" src="../../../../Macaulay2/Style/katex/contrib/copy-tex.min.js"></script> <script defer="defer" src="../../../../Macaulay2/Style/katex/contrib/render-a11y-string.min.js"></script> <script src="../../../../Macaulay2/Style/prism.js"></script> <script>var current_version = '1.25.06';</script> <script src="../../../../Macaulay2/Style/version-select.js"></script> <link type="image/x-icon" rel="icon" href="../../../../Macaulay2/Style/icon.gif"> </head> <body> <div id="buttons"> <div> <a href="https://macaulay2.com/">Macaulay2</a> <span id="version-select-container"></span> » <a title="Macaulay2 documentation" href="../../Macaulay2Doc/html/index.html">Documentation </a> <br><a href="../../Macaulay2Doc/html/_packages_spprovided_spwith_sp__Macaulay2.html">Packages</a> » <span><a title="interface to Python" href="index.html">Python</a> :: <a title="set elements of mutable python sequences" href="_setitem.html">setitem</a></span> </div> <div class="right"> <form method="get" action="https://www.google.com/search"> <input placeholder="Search" type="text" name="q" value=""> <input type="hidden" name="q" value="site:macaulay2.com/doc"> </form> <a href="_stmt.html">next</a> | <a href="_setattr.html">previous</a> | <a href="_stmt.html">forward</a> | <a href="_setattr.html">backward</a> | up | <a href="master.html">index</a> | <a href="toc.html">toc</a> </div> </div> <hr> <div> <h1>setitem -- set elements of mutable python sequences</h1> <ul> <li> <dl class="element"> <dt>Usage: </dt> <dd><code class="language-macaulay2">setitem(x, y, e)</code></dd> <dd><code class="language-macaulay2">x_y = e</code></dd> </dl> </li> <li>Inputs: <ul> <li><span><span class="tt">x</span>, <span>a <a title="a python object" href="___Python__Object.html">python object</a></span>, </span></li> <li><span><span class="tt">y</span>, <span>a <a title="the class of all things" href="../../Macaulay2Doc/html/___Thing.html">thing</a></span>, </span></li> <li><span><span class="tt">e</span>, <span>a <a title="the class of all things" href="../../Macaulay2Doc/html/___Thing.html">thing</a></span>, </span></li> </ul> </li> </ul> <div> <h2>Description</h2> <div> <p>You may set elements of mutable python sequences using <span class="tt">setitem</span> or the shortcut <span class="tt">_</span>. This is equivalent to square brackets (<span class="tt">[]</span>) in Python. For example, this works for lists.</p> </div> <table class="examples"> <tr> <td> <pre><code class="language-macaulay2">i1 : x = pythonValue "[1,2,3,4]" o1 = [1, 2, 3, 4] o1 : PythonObject of class list</code></pre> </td> </tr> <tr> <td> <pre><code class="language-macaulay2">i2 : setitem(x, 0, 5)</code></pre> </td> </tr> <tr> <td> <pre><code class="language-macaulay2">i3 : x o3 = [5, 2, 3, 4] o3 : PythonObject of class list</code></pre> </td> </tr> </table> <div> <p>It also works for dictionaries.</p> </div> <table class="examples"> <tr> <td> <pre><code class="language-macaulay2">i4 : x = pythonValue "{'spam':1,'eggs':2}" o4 = {'spam': 1, 'eggs': 2} o4 : PythonObject of class dict</code></pre> </td> </tr> <tr> <td> <pre><code class="language-macaulay2">i5 : x_"ham" = 3</code></pre> </td> </tr> <tr> <td> <pre><code class="language-macaulay2">i6 : x o6 = {'spam': 1, 'eggs': 2, 'ham': 3} o6 : PythonObject of class dict</code></pre> </td> </tr> </table> </div> <div> <div class="waystouse"> <h2>Ways to use <span class="tt">setitem</span>:</h2> <ul> <li><kbd>setitem(PythonObject,Thing,Thing)</kbd></li> </ul> </div> <div class="waystouse"> <h2>For the programmer</h2> <p>The object <a title="set elements of mutable python sequences" href="_setitem.html">setitem</a> is <span>a <a title="a type of method function" href="../../Macaulay2Doc/html/___Method__Function.html">method function</a></span>.</p> </div> <hr> <div class="waystouse"> <p>The source of this document is in <span class="tt">Python/doc.m2:193:0</span>.</p> </div> </div> </div> </body> </html>