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<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" /> <title>pprint — Data pretty printer — Python 3.10.12 documentation</title><meta name="viewport" content="width=device-width, initial-scale=1.0"> <link rel="stylesheet" type="text/css" href="../_static/pygments.css" /> <link rel="stylesheet" type="text/css" href="../_static/pydoctheme.css?2022.1" /> <script data-url_root="../" id="documentation_options" src="../_static/documentation_options.js"></script> <script src="../_static/jquery.js"></script> <script src="../_static/underscore.js"></script> <script src="../_static/doctools.js"></script> <script src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 3.10.12 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="next" title="reprlib — Alternate repr() implementation" href="reprlib.html" /> <link rel="prev" title="copy — Shallow and deep copy operations" href="copy.html" /> <link rel="canonical" href="file:///usr/share/doc/python3.10/html/library/pprint.html" /> <style> @media only screen { table.full-width-table { width: 100%; 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margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li class="switchers"> <div class="language_switcher_placeholder"></div> <div class="version_switcher_placeholder"></div> </li> <li> </li> <li id="cpython-language-and-version"> <a href="../index.html">3.10.12 Documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="datatypes.html" accesskey="U">Data Types</a> »</li> <li class="nav-item nav-item-this"><a href=""><code class="xref py py-mod docutils literal notranslate"><span class="pre">pprint</span></code> — Data pretty printer</a></li> <li class="right"> <div class="inline-search" role="search"> <form class="inline-search" action="../search.html" method="get"> <input placeholder="Quick search" aria-label="Quick search" type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> | </li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <section id="module-pprint"> <span id="pprint-data-pretty-printer"></span><h1><a class="reference internal" href="#module-pprint" title="pprint: Data pretty printer."><code class="xref py py-mod docutils literal notranslate"><span class="pre">pprint</span></code></a> — Data pretty printer<a class="headerlink" href="#module-pprint" title="Permalink to this headline">¶</a></h1> <p><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/3.10/Lib/pprint.py">Lib/pprint.py</a></p> <hr class="docutils" /> <p>The <a class="reference internal" href="#module-pprint" title="pprint: Data pretty printer."><code class="xref py py-mod docutils literal notranslate"><span class="pre">pprint</span></code></a> module provides a capability to “pretty-print” arbitrary Python data structures in a form which can be used as input to the interpreter. If the formatted structures include objects which are not fundamental Python types, the representation may not be loadable. This may be the case if objects such as files, sockets or classes are included, as well as many other objects which are not representable as Python literals.</p> <p>The formatted representation keeps objects on a single line if it can, and breaks them onto multiple lines if they don’t fit within the allowed width. Construct <a class="reference internal" href="#pprint.PrettyPrinter" title="pprint.PrettyPrinter"><code class="xref py py-class docutils literal notranslate"><span class="pre">PrettyPrinter</span></code></a> objects explicitly if you need to adjust the width constraint.</p> <p>Dictionaries are sorted by key before the display is computed.</p> <div class="versionchanged"> <p><span class="versionmodified changed">Changed in version 3.9: </span>Added support for pretty-printing <a class="reference internal" href="types.html#types.SimpleNamespace" title="types.SimpleNamespace"><code class="xref py py-class docutils literal notranslate"><span class="pre">types.SimpleNamespace</span></code></a>.</p> </div> <div class="versionchanged"> <p><span class="versionmodified changed">Changed in version 3.10: </span>Added support for pretty-printing <a class="reference internal" href="dataclasses.html#dataclasses.dataclass" title="dataclasses.dataclass"><code class="xref py py-class docutils literal notranslate"><span class="pre">dataclasses.dataclass</span></code></a>.</p> </div> <p>The <a class="reference internal" href="#module-pprint" title="pprint: Data pretty printer."><code class="xref py py-mod docutils literal notranslate"><span class="pre">pprint</span></code></a> module defines one class:</p> <span class="target" id="index-0"></span><dl class="py class"> <dt class="sig sig-object py" id="pprint.PrettyPrinter"> <em class="property"><span class="pre">class</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">pprint.</span></span><span class="sig-name descname"><span class="pre">PrettyPrinter</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">indent</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">1</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">width</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">80</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">depth</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">stream</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="o"><span class="pre">*</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">compact</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">False</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">sort_dicts</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">True</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">underscore_numbers</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">False</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pprint.PrettyPrinter" title="Permalink to this definition">¶</a></dt> <dd><p>Construct a <a class="reference internal" href="#pprint.PrettyPrinter" title="pprint.PrettyPrinter"><code class="xref py py-class docutils literal notranslate"><span class="pre">PrettyPrinter</span></code></a> instance. This constructor understands several keyword parameters.</p> <p><em>stream</em> (default <code class="docutils literal notranslate"><span class="pre">sys.stdout</span></code>) is a <a class="reference internal" href="../glossary.html#term-file-like-object"><span class="xref std std-term">file-like object</span></a> to which the output will be written by calling its <code class="xref py py-meth docutils literal notranslate"><span class="pre">write()</span></code> method.</p> <p>Other values configure the manner in which nesting of complex data structures is displayed.</p> <p><em>indent</em> (default 1) specifies the amount of indentation added for each nesting level.</p> <p><em>depth</em> controls the number of nesting levels which may be printed; if the data structure being printed is too deep, the next contained level is replaced by <code class="docutils literal notranslate"><span class="pre">...</span></code>. By default, there is no constraint on the depth of the objects being formatted.</p> <p><em>width</em> (default 80) specifies the desired maximum number of characters per line in the output. If a structure cannot be formatted within the width constraint, a best effort will be made.</p> <p><em>compact</em> impacts the way that long sequences (lists, tuples, sets, etc) are formatted. If <em>compact</em> is false (the default) then each item of a sequence will be formatted on a separate line. If <em>compact</em> is true, as many items as will fit within the <em>width</em> will be formatted on each output line.</p> <p>If <em>sort_dicts</em> is true (the default), dictionaries will be formatted with their keys sorted, otherwise they will display in insertion order.</p> <p>If <em>underscore_numbers</em> is true, integers will be formatted with the <code class="docutils literal notranslate"><span class="pre">_</span></code> character for a thousands separator, otherwise underscores are not displayed (the default).</p> <div class="versionchanged"> <p><span class="versionmodified changed">Changed in version 3.4: </span>Added the <em>compact</em> parameter.</p> </div> <div class="versionchanged"> <p><span class="versionmodified changed">Changed in version 3.8: </span>Added the <em>sort_dicts</em> parameter.</p> </div> <div class="versionchanged"> <p><span class="versionmodified changed">Changed in version 3.10: </span>Added the <em>underscore_numbers</em> parameter.</p> <div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">pprint</span> <span class="gp">>>> </span><span class="n">stuff</span> <span class="o">=</span> <span class="p">[</span><span class="s1">'spam'</span><span class="p">,</span> <span class="s1">'eggs'</span><span class="p">,</span> <span class="s1">'lumberjack'</span><span class="p">,</span> <span class="s1">'knights'</span><span class="p">,</span> <span class="s1">'ni'</span><span class="p">]</span> <span class="gp">>>> </span><span class="n">stuff</span><span class="o">.</span><span class="n">insert</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="n">stuff</span><span class="p">[:])</span> <span class="gp">>>> </span><span class="n">pp</span> <span class="o">=</span> <span class="n">pprint</span><span class="o">.</span><span class="n">PrettyPrinter</span><span class="p">(</span><span class="n">indent</span><span class="o">=</span><span class="mi">4</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">pp</span><span class="o">.</span><span class="n">pprint</span><span class="p">(</span><span class="n">stuff</span><span class="p">)</span> <span class="go">[ ['spam', 'eggs', 'lumberjack', 'knights', 'ni'],</span> <span class="go"> 'spam',</span> <span class="go"> 'eggs',</span> <span class="go"> 'lumberjack',</span> <span class="go"> 'knights',</span> <span class="go"> 'ni']</span> <span class="gp">>>> </span><span class="n">pp</span> <span class="o">=</span> <span class="n">pprint</span><span class="o">.</span><span class="n">PrettyPrinter</span><span class="p">(</span><span class="n">width</span><span class="o">=</span><span class="mi">41</span><span class="p">,</span> <span class="n">compact</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">pp</span><span class="o">.</span><span class="n">pprint</span><span class="p">(</span><span class="n">stuff</span><span class="p">)</span> <span class="go">[['spam', 'eggs', 'lumberjack',</span> <span class="go"> 'knights', 'ni'],</span> <span class="go"> 'spam', 'eggs', 'lumberjack', 'knights',</span> <span class="go"> 'ni']</span> <span class="gp">>>> </span><span class="n">tup</span> <span class="o">=</span> <span class="p">(</span><span class="s1">'spam'</span><span class="p">,</span> <span class="p">(</span><span class="s1">'eggs'</span><span class="p">,</span> <span class="p">(</span><span class="s1">'lumberjack'</span><span class="p">,</span> <span class="p">(</span><span class="s1">'knights'</span><span class="p">,</span> <span class="p">(</span><span class="s1">'ni'</span><span class="p">,</span> <span class="p">(</span><span class="s1">'dead'</span><span class="p">,</span> <span class="gp">... </span><span class="p">(</span><span class="s1">'parrot'</span><span class="p">,</span> <span class="p">(</span><span class="s1">'fresh fruit'</span><span class="p">,))))))))</span> <span class="gp">>>> </span><span class="n">pp</span> <span class="o">=</span> <span class="n">pprint</span><span class="o">.</span><span class="n">PrettyPrinter</span><span class="p">(</span><span class="n">depth</span><span class="o">=</span><span class="mi">6</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">pp</span><span class="o">.</span><span class="n">pprint</span><span class="p">(</span><span class="n">tup</span><span class="p">)</span> <span class="go">('spam', ('eggs', ('lumberjack', ('knights', ('ni', ('dead', (...)))))))</span> </pre></div> </div> </div> </dd></dl> <p>The <a class="reference internal" href="#module-pprint" title="pprint: Data pretty printer."><code class="xref py py-mod docutils literal notranslate"><span class="pre">pprint</span></code></a> module also provides several shortcut functions:</p> <dl class="py function"> <dt class="sig sig-object py" id="pprint.pformat"> <span class="sig-prename descclassname"><span class="pre">pprint.</span></span><span class="sig-name descname"><span class="pre">pformat</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">object</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">indent</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">1</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">width</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">80</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">depth</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="o"><span class="pre">*</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">compact</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">False</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">sort_dicts</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">True</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">underscore_numbers</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">False</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pprint.pformat" title="Permalink to this definition">¶</a></dt> <dd><p>Return the formatted representation of <em>object</em> as a string. <em>indent</em>, <em>width</em>, <em>depth</em>, <em>compact</em>, <em>sort_dicts</em> and <em>underscore_numbers</em> will be passed to the <a class="reference internal" href="#pprint.PrettyPrinter" title="pprint.PrettyPrinter"><code class="xref py py-class docutils literal notranslate"><span class="pre">PrettyPrinter</span></code></a> constructor as formatting parameters.</p> <div class="versionchanged"> <p><span class="versionmodified changed">Changed in version 3.4: </span>Added the <em>compact</em> parameter.</p> </div> <div class="versionchanged"> <p><span class="versionmodified changed">Changed in version 3.8: </span>Added the <em>sort_dicts</em> parameter.</p> </div> <div class="versionchanged"> <p><span class="versionmodified changed">Changed in version 3.10: </span>Added the <em>underscore_numbers</em> parameter.</p> </div> </dd></dl> <dl class="py function"> <dt class="sig sig-object py" id="pprint.pp"> <span class="sig-prename descclassname"><span class="pre">pprint.</span></span><span class="sig-name descname"><span class="pre">pp</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">object</span></span></em>, <em class="sig-param"><span class="o"><span class="pre">*</span></span><span class="n"><span class="pre">args</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">sort_dicts</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">False</span></span></em>, <em class="sig-param"><span class="o"><span class="pre">**</span></span><span class="n"><span class="pre">kwargs</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pprint.pp" title="Permalink to this definition">¶</a></dt> <dd><p>Prints the formatted representation of <em>object</em> followed by a newline. If <em>sort_dicts</em> is false (the default), dictionaries will be displayed with their keys in insertion order, otherwise the dict keys will be sorted. <em>args</em> and <em>kwargs</em> will be passed to <a class="reference internal" href="#module-pprint" title="pprint: Data pretty printer."><code class="xref py py-func docutils literal notranslate"><span class="pre">pprint()</span></code></a> as formatting parameters.</p> <div class="versionadded"> <p><span class="versionmodified added">New in version 3.8.</span></p> </div> </dd></dl> <dl class="py function"> <dt class="sig sig-object py" id="pprint.pprint"> <span class="sig-prename descclassname"><span class="pre">pprint.</span></span><span class="sig-name descname"><span class="pre">pprint</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">object</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">stream</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">indent</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">1</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">width</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">80</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">depth</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="o"><span class="pre">*</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">compact</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">False</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">sort_dicts</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">True</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">underscore_numbers</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">False</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pprint.pprint" title="Permalink to this definition">¶</a></dt> <dd><p>Prints the formatted representation of <em>object</em> on <em>stream</em>, followed by a newline. If <em>stream</em> is <code class="docutils literal notranslate"><span class="pre">None</span></code>, <code class="docutils literal notranslate"><span class="pre">sys.stdout</span></code> is used. This may be used in the interactive interpreter instead of the <a class="reference internal" href="functions.html#print" title="print"><code class="xref py py-func docutils literal notranslate"><span class="pre">print()</span></code></a> function for inspecting values (you can even reassign <code class="docutils literal notranslate"><span class="pre">print</span> <span class="pre">=</span> <span class="pre">pprint.pprint</span></code> for use within a scope). <em>indent</em>, <em>width</em>, <em>depth</em>, <em>compact</em>, <em>sort_dicts</em> and <em>underscore_numbers</em> will be passed to the <a class="reference internal" href="#pprint.PrettyPrinter" title="pprint.PrettyPrinter"><code class="xref py py-class docutils literal notranslate"><span class="pre">PrettyPrinter</span></code></a> constructor as formatting parameters.</p> <div class="versionchanged"> <p><span class="versionmodified changed">Changed in version 3.4: </span>Added the <em>compact</em> parameter.</p> </div> <div class="versionchanged"> <p><span class="versionmodified changed">Changed in version 3.8: </span>Added the <em>sort_dicts</em> parameter.</p> </div> <div class="versionchanged"> <p><span class="versionmodified changed">Changed in version 3.10: </span>Added the <em>underscore_numbers</em> parameter.</p> <div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">pprint</span> <span class="gp">>>> </span><span class="n">stuff</span> <span class="o">=</span> <span class="p">[</span><span class="s1">'spam'</span><span class="p">,</span> <span class="s1">'eggs'</span><span class="p">,</span> <span class="s1">'lumberjack'</span><span class="p">,</span> <span class="s1">'knights'</span><span class="p">,</span> <span class="s1">'ni'</span><span class="p">]</span> <span class="gp">>>> </span><span class="n">stuff</span><span class="o">.</span><span class="n">insert</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="n">stuff</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">pprint</span><span class="o">.</span><span class="n">pprint</span><span class="p">(</span><span class="n">stuff</span><span class="p">)</span> <span class="go">[<Recursion on list with id=...>,</span> <span class="go"> 'spam',</span> <span class="go"> 'eggs',</span> <span class="go"> 'lumberjack',</span> <span class="go"> 'knights',</span> <span class="go"> 'ni']</span> </pre></div> </div> </div> </dd></dl> <dl class="py function"> <dt class="sig sig-object py" id="pprint.isreadable"> <span class="sig-prename descclassname"><span class="pre">pprint.</span></span><span class="sig-name descname"><span class="pre">isreadable</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">object</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pprint.isreadable" title="Permalink to this definition">¶</a></dt> <dd><p id="index-1">Determine if the formatted representation of <em>object</em> is “readable”, or can be used to reconstruct the value using <a class="reference internal" href="functions.html#eval" title="eval"><code class="xref py py-func docutils literal notranslate"><span class="pre">eval()</span></code></a>. This always returns <code class="docutils literal notranslate"><span class="pre">False</span></code> for recursive objects.</p> <div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">pprint</span><span class="o">.</span><span class="n">isreadable</span><span class="p">(</span><span class="n">stuff</span><span class="p">)</span> <span class="go">False</span> </pre></div> </div> </dd></dl> <dl class="py function"> <dt class="sig sig-object py" id="pprint.isrecursive"> <span class="sig-prename descclassname"><span class="pre">pprint.</span></span><span class="sig-name descname"><span class="pre">isrecursive</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">object</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pprint.isrecursive" title="Permalink to this definition">¶</a></dt> <dd><p>Determine if <em>object</em> requires a recursive representation.</p> </dd></dl> <p>One more support function is also defined:</p> <dl class="py function"> <dt class="sig sig-object py" id="pprint.saferepr"> <span class="sig-prename descclassname"><span class="pre">pprint.</span></span><span class="sig-name descname"><span class="pre">saferepr</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">object</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pprint.saferepr" title="Permalink to this definition">¶</a></dt> <dd><p>Return a string representation of <em>object</em>, protected against recursive data structures. If the representation of <em>object</em> exposes a recursive entry, the recursive reference will be represented as <code class="docutils literal notranslate"><span class="pre"><Recursion</span> <span class="pre">on</span> <span class="pre">typename</span> <span class="pre">with</span> <span class="pre">id=number></span></code>. The representation is not otherwise formatted.</p> <div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">pprint</span><span class="o">.</span><span class="n">saferepr</span><span class="p">(</span><span class="n">stuff</span><span class="p">)</span> <span class="go">"[<Recursion on list with id=...>, 'spam', 'eggs', 'lumberjack', 'knights', 'ni']"</span> </pre></div> </div> </dd></dl> <section id="prettyprinter-objects"> <span id="id1"></span><h2>PrettyPrinter Objects<a class="headerlink" href="#prettyprinter-objects" title="Permalink to this headline">¶</a></h2> <p><a class="reference internal" href="#pprint.PrettyPrinter" title="pprint.PrettyPrinter"><code class="xref py py-class docutils literal notranslate"><span class="pre">PrettyPrinter</span></code></a> instances have the following methods:</p> <dl class="py method"> <dt class="sig sig-object py" id="pprint.PrettyPrinter.pformat"> <span class="sig-prename descclassname"><span class="pre">PrettyPrinter.</span></span><span class="sig-name descname"><span class="pre">pformat</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">object</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pprint.PrettyPrinter.pformat" title="Permalink to this definition">¶</a></dt> <dd><p>Return the formatted representation of <em>object</em>. This takes into account the options passed to the <a class="reference internal" href="#pprint.PrettyPrinter" title="pprint.PrettyPrinter"><code class="xref py py-class docutils literal notranslate"><span class="pre">PrettyPrinter</span></code></a> constructor.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="pprint.PrettyPrinter.pprint"> <span class="sig-prename descclassname"><span class="pre">PrettyPrinter.</span></span><span class="sig-name descname"><span class="pre">pprint</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">object</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pprint.PrettyPrinter.pprint" title="Permalink to this definition">¶</a></dt> <dd><p>Print the formatted representation of <em>object</em> on the configured stream, followed by a newline.</p> </dd></dl> <p>The following methods provide the implementations for the corresponding functions of the same names. Using these methods on an instance is slightly more efficient since new <a class="reference internal" href="#pprint.PrettyPrinter" title="pprint.PrettyPrinter"><code class="xref py py-class docutils literal notranslate"><span class="pre">PrettyPrinter</span></code></a> objects don’t need to be created.</p> <dl class="py method"> <dt class="sig sig-object py" id="pprint.PrettyPrinter.isreadable"> <span class="sig-prename descclassname"><span class="pre">PrettyPrinter.</span></span><span class="sig-name descname"><span class="pre">isreadable</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">object</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pprint.PrettyPrinter.isreadable" title="Permalink to this definition">¶</a></dt> <dd><p id="index-2">Determine if the formatted representation of the object is “readable,” or can be used to reconstruct the value using <a class="reference internal" href="functions.html#eval" title="eval"><code class="xref py py-func docutils literal notranslate"><span class="pre">eval()</span></code></a>. Note that this returns <code class="docutils literal notranslate"><span class="pre">False</span></code> for recursive objects. If the <em>depth</em> parameter of the <a class="reference internal" href="#pprint.PrettyPrinter" title="pprint.PrettyPrinter"><code class="xref py py-class docutils literal notranslate"><span class="pre">PrettyPrinter</span></code></a> is set and the object is deeper than allowed, this returns <code class="docutils literal notranslate"><span class="pre">False</span></code>.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="pprint.PrettyPrinter.isrecursive"> <span class="sig-prename descclassname"><span class="pre">PrettyPrinter.</span></span><span class="sig-name descname"><span class="pre">isrecursive</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">object</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pprint.PrettyPrinter.isrecursive" title="Permalink to this definition">¶</a></dt> <dd><p>Determine if the object requires a recursive representation.</p> </dd></dl> <p>This method is provided as a hook to allow subclasses to modify the way objects are converted to strings. The default implementation uses the internals of the <a class="reference internal" href="#pprint.saferepr" title="pprint.saferepr"><code class="xref py py-func docutils literal notranslate"><span class="pre">saferepr()</span></code></a> implementation.</p> <dl class="py method"> <dt class="sig sig-object py" id="pprint.PrettyPrinter.format"> <span class="sig-prename descclassname"><span class="pre">PrettyPrinter.</span></span><span class="sig-name descname"><span class="pre">format</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">object</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">context</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">maxlevels</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">level</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pprint.PrettyPrinter.format" title="Permalink to this definition">¶</a></dt> <dd><p>Returns three values: the formatted version of <em>object</em> as a string, a flag indicating whether the result is readable, and a flag indicating whether recursion was detected. The first argument is the object to be presented. The second is a dictionary which contains the <a class="reference internal" href="functions.html#id" title="id"><code class="xref py py-func docutils literal notranslate"><span class="pre">id()</span></code></a> of objects that are part of the current presentation context (direct and indirect containers for <em>object</em> that are affecting the presentation) as the keys; if an object needs to be presented which is already represented in <em>context</em>, the third return value should be <code class="docutils literal notranslate"><span class="pre">True</span></code>. Recursive calls to the <a class="reference internal" href="#pprint.PrettyPrinter.format" title="pprint.PrettyPrinter.format"><code class="xref py py-meth docutils literal notranslate"><span class="pre">format()</span></code></a> method should add additional entries for containers to this dictionary. The third argument, <em>maxlevels</em>, gives the requested limit to recursion; this will be <code class="docutils literal notranslate"><span class="pre">0</span></code> if there is no requested limit. This argument should be passed unmodified to recursive calls. The fourth argument, <em>level</em>, gives the current level; recursive calls should be passed a value less than that of the current call.</p> </dd></dl> </section> <section id="example"> <span id="pprint-example"></span><h2>Example<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h2> <p>To demonstrate several uses of the <a class="reference internal" href="#module-pprint" title="pprint: Data pretty printer."><code class="xref py py-func docutils literal notranslate"><span class="pre">pprint()</span></code></a> function and its parameters, let’s fetch information about a project from <a class="reference external" href="https://pypi.org">PyPI</a>:</p> <div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">json</span> <span class="gp">>>> </span><span class="kn">import</span> <span class="nn">pprint</span> <span class="gp">>>> </span><span class="kn">from</span> <span class="nn">urllib.request</span> <span class="kn">import</span> <span class="n">urlopen</span> <span class="gp">>>> </span><span class="k">with</span> <span class="n">urlopen</span><span class="p">(</span><span class="s1">'https://pypi.org/pypi/sampleproject/json'</span><span class="p">)</span> <span class="k">as</span> <span class="n">resp</span><span class="p">:</span> <span class="gp">... </span> <span class="n">project_info</span> <span class="o">=</span> <span class="n">json</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">resp</span><span class="p">)[</span><span class="s1">'info'</span><span class="p">]</span> </pre></div> </div> <p>In its basic form, <a class="reference internal" href="#module-pprint" title="pprint: Data pretty printer."><code class="xref py py-func docutils literal notranslate"><span class="pre">pprint()</span></code></a> shows the whole object:</p> <div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">pprint</span><span class="o">.</span><span class="n">pprint</span><span class="p">(</span><span class="n">project_info</span><span class="p">)</span> <span class="go">{'author': 'The Python Packaging Authority',</span> <span class="go"> 'author_email': 'pypa-dev@googlegroups.com',</span> <span class="go"> 'bugtrack_url': None,</span> <span class="go"> 'classifiers': ['Development Status :: 3 - Alpha',</span> <span class="go"> 'Intended Audience :: Developers',</span> <span class="go"> 'License :: OSI Approved :: MIT License',</span> <span class="go"> 'Programming Language :: Python :: 2',</span> <span class="go"> 'Programming Language :: Python :: 2.6',</span> <span class="go"> 'Programming Language :: Python :: 2.7',</span> <span class="go"> 'Programming Language :: Python :: 3',</span> <span class="go"> 'Programming Language :: Python :: 3.2',</span> <span class="go"> 'Programming Language :: Python :: 3.3',</span> <span class="go"> 'Programming Language :: Python :: 3.4',</span> <span class="go"> 'Topic :: Software Development :: Build Tools'],</span> <span class="go"> 'description': 'A sample Python project\n'</span> <span class="go"> '=======================\n'</span> <span class="go"> '\n'</span> <span class="go"> 'This is the description file for the project.\n'</span> <span class="go"> '\n'</span> <span class="go"> 'The file should use UTF-8 encoding and be written using '</span> <span class="go"> 'ReStructured Text. It\n'</span> <span class="go"> 'will be used to generate the project webpage on PyPI, and '</span> <span class="go"> 'should be written for\n'</span> <span class="go"> 'that purpose.\n'</span> <span class="go"> '\n'</span> <span class="go"> 'Typical contents for this file would include an overview of '</span> <span class="go"> 'the project, basic\n'</span> <span class="go"> 'usage examples, etc. Generally, including the project '</span> <span class="go"> 'changelog in here is not\n'</span> <span class="go"> 'a good idea, although a simple "What\'s New" section for the '</span> <span class="go"> 'most recent version\n'</span> <span class="go"> 'may be appropriate.',</span> <span class="go"> 'description_content_type': None,</span> <span class="go"> 'docs_url': None,</span> <span class="go"> 'download_url': 'UNKNOWN',</span> <span class="go"> 'downloads': {'last_day': -1, 'last_month': -1, 'last_week': -1},</span> <span class="go"> 'home_page': 'https://github.com/pypa/sampleproject',</span> <span class="go"> 'keywords': 'sample setuptools development',</span> <span class="go"> 'license': 'MIT',</span> <span class="go"> 'maintainer': None,</span> <span class="go"> 'maintainer_email': None,</span> <span class="go"> 'name': 'sampleproject',</span> <span class="go"> 'package_url': 'https://pypi.org/project/sampleproject/',</span> <span class="go"> 'platform': 'UNKNOWN',</span> <span class="go"> 'project_url': 'https://pypi.org/project/sampleproject/',</span> <span class="go"> 'project_urls': {'Download': 'UNKNOWN',</span> <span class="go"> 'Homepage': 'https://github.com/pypa/sampleproject'},</span> <span class="go"> 'release_url': 'https://pypi.org/project/sampleproject/1.2.0/',</span> <span class="go"> 'requires_dist': None,</span> <span class="go"> 'requires_python': None,</span> <span class="go"> 'summary': 'A sample Python project',</span> <span class="go"> 'version': '1.2.0'}</span> </pre></div> </div> <p>The result can be limited to a certain <em>depth</em> (ellipsis is used for deeper contents):</p> <div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">pprint</span><span class="o">.</span><span class="n">pprint</span><span class="p">(</span><span class="n">project_info</span><span class="p">,</span> <span class="n">depth</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span> <span class="go">{'author': 'The Python Packaging Authority',</span> <span class="go"> 'author_email': 'pypa-dev@googlegroups.com',</span> <span class="go"> 'bugtrack_url': None,</span> <span class="go"> 'classifiers': [...],</span> <span class="go"> 'description': 'A sample Python project\n'</span> <span class="go"> '=======================\n'</span> <span class="go"> '\n'</span> <span class="go"> 'This is the description file for the project.\n'</span> <span class="go"> '\n'</span> <span class="go"> 'The file should use UTF-8 encoding and be written using '</span> <span class="go"> 'ReStructured Text. It\n'</span> <span class="go"> 'will be used to generate the project webpage on PyPI, and '</span> <span class="go"> 'should be written for\n'</span> <span class="go"> 'that purpose.\n'</span> <span class="go"> '\n'</span> <span class="go"> 'Typical contents for this file would include an overview of '</span> <span class="go"> 'the project, basic\n'</span> <span class="go"> 'usage examples, etc. Generally, including the project '</span> <span class="go"> 'changelog in here is not\n'</span> <span class="go"> 'a good idea, although a simple "What\'s New" section for the '</span> <span class="go"> 'most recent version\n'</span> <span class="go"> 'may be appropriate.',</span> <span class="go"> 'description_content_type': None,</span> <span class="go"> 'docs_url': None,</span> <span class="go"> 'download_url': 'UNKNOWN',</span> <span class="go"> 'downloads': {...},</span> <span class="go"> 'home_page': 'https://github.com/pypa/sampleproject',</span> <span class="go"> 'keywords': 'sample setuptools development',</span> <span class="go"> 'license': 'MIT',</span> <span class="go"> 'maintainer': None,</span> <span class="go"> 'maintainer_email': None,</span> <span class="go"> 'name': 'sampleproject',</span> <span class="go"> 'package_url': 'https://pypi.org/project/sampleproject/',</span> <span class="go"> 'platform': 'UNKNOWN',</span> <span class="go"> 'project_url': 'https://pypi.org/project/sampleproject/',</span> <span class="go"> 'project_urls': {...},</span> <span class="go"> 'release_url': 'https://pypi.org/project/sampleproject/1.2.0/',</span> <span class="go"> 'requires_dist': None,</span> <span class="go"> 'requires_python': None,</span> <span class="go"> 'summary': 'A sample Python project',</span> <span class="go"> 'version': '1.2.0'}</span> </pre></div> </div> <p>Additionally, maximum character <em>width</em> can be suggested. If a long object cannot be split, the specified width will be exceeded:</p> <div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">pprint</span><span class="o">.</span><span class="n">pprint</span><span class="p">(</span><span class="n">project_info</span><span class="p">,</span> <span class="n">depth</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">width</span><span class="o">=</span><span class="mi">60</span><span class="p">)</span> <span class="go">{'author': 'The Python Packaging Authority',</span> <span class="go"> 'author_email': 'pypa-dev@googlegroups.com',</span> <span class="go"> 'bugtrack_url': None,</span> <span class="go"> 'classifiers': [...],</span> <span class="go"> 'description': 'A sample Python project\n'</span> <span class="go"> '=======================\n'</span> <span class="go"> '\n'</span> <span class="go"> 'This is the description file for the '</span> <span class="go"> 'project.\n'</span> <span class="go"> '\n'</span> <span class="go"> 'The file should use UTF-8 encoding and be '</span> <span class="go"> 'written using ReStructured Text. It\n'</span> <span class="go"> 'will be used to generate the project '</span> <span class="go"> 'webpage on PyPI, and should be written '</span> <span class="go"> 'for\n'</span> <span class="go"> 'that purpose.\n'</span> <span class="go"> '\n'</span> <span class="go"> 'Typical contents for this file would '</span> <span class="go"> 'include an overview of the project, '</span> <span class="go"> 'basic\n'</span> <span class="go"> 'usage examples, etc. Generally, including '</span> <span class="go"> 'the project changelog in here is not\n'</span> <span class="go"> 'a good idea, although a simple "What\'s '</span> <span class="go"> 'New" section for the most recent version\n'</span> <span class="go"> 'may be appropriate.',</span> <span class="go"> 'description_content_type': None,</span> <span class="go"> 'docs_url': None,</span> <span class="go"> 'download_url': 'UNKNOWN',</span> <span class="go"> 'downloads': {...},</span> <span class="go"> 'home_page': 'https://github.com/pypa/sampleproject',</span> <span class="go"> 'keywords': 'sample setuptools development',</span> <span class="go"> 'license': 'MIT',</span> <span class="go"> 'maintainer': None,</span> <span class="go"> 'maintainer_email': None,</span> <span class="go"> 'name': 'sampleproject',</span> <span class="go"> 'package_url': 'https://pypi.org/project/sampleproject/',</span> <span class="go"> 'platform': 'UNKNOWN',</span> <span class="go"> 'project_url': 'https://pypi.org/project/sampleproject/',</span> <span class="go"> 'project_urls': {...},</span> <span class="go"> 'release_url': 'https://pypi.org/project/sampleproject/1.2.0/',</span> <span class="go"> 'requires_dist': None,</span> <span class="go"> 'requires_python': None,</span> <span class="go"> 'summary': 'A sample Python project',</span> <span class="go"> 'version': '1.2.0'}</span> </pre></div> </div> </section> </section> <div class="clearer"></div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h3><a href="../contents.html">Table of Contents</a></h3> <ul> <li><a class="reference internal" href="#"><code class="xref py py-mod docutils literal notranslate"><span class="pre">pprint</span></code> — Data pretty printer</a><ul> <li><a class="reference internal" href="#prettyprinter-objects">PrettyPrinter Objects</a></li> <li><a class="reference internal" href="#example">Example</a></li> </ul> </li> </ul> <h4>Previous topic</h4> <p class="topless"><a href="copy.html" title="previous chapter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">copy</span></code> — Shallow and deep copy operations</a></p> <h4>Next topic</h4> <p class="topless"><a href="reprlib.html" title="next chapter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">reprlib</span></code> — Alternate <code class="xref py py-func docutils literal notranslate"><span class="pre">repr()</span></code> implementation</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../bugs.html">Report a Bug</a></li> <li> <a href="https://github.com/python/cpython/blob/3.10/Doc/library/pprint.rst" rel="nofollow">Show Source </a> </li> </ul> </div> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="reprlib.html" title="reprlib — Alternate repr() implementation" >next</a> |</li> <li class="right" > <a href="copy.html" title="copy — Shallow and deep copy operations" >previous</a> |</li> <li><img src="../_static/py.svg" alt="python logo" style="vertical-align: middle; 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