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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>pkgutil — Package extension utility — 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="modulefinder — Find modules used by a script" href="modulefinder.html" /> <link rel="prev" title="zipimport — Import modules from Zip archives" href="zipimport.html" /> <link rel="canonical" href="file:///usr/share/doc/python3.10/html/library/pkgutil.html" /> <style> @media only screen { table.full-width-table { width: 100%; 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Intended use is to place the following code in a package’s <code class="file docutils literal notranslate"><span class="pre">__init__.py</span></code>:</p> <div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">pkgutil</span> <span class="kn">import</span> <span class="n">extend_path</span> <span class="n">__path__</span> <span class="o">=</span> <span class="n">extend_path</span><span class="p">(</span><span class="n">__path__</span><span class="p">,</span> <span class="vm">__name__</span><span class="p">)</span> </pre></div> </div> <p>This will add to the package’s <code class="docutils literal notranslate"><span class="pre">__path__</span></code> all subdirectories of directories on <a class="reference internal" href="sys.html#sys.path" title="sys.path"><code class="xref py py-data docutils literal notranslate"><span class="pre">sys.path</span></code></a> named after the package. This is useful if one wants to distribute different parts of a single logical package as multiple directories.</p> <p>It also looks for <code class="file docutils literal notranslate"><span class="pre">*.pkg</span></code> files beginning where <code class="docutils literal notranslate"><span class="pre">*</span></code> matches the <em>name</em> argument. This feature is similar to <code class="file docutils literal notranslate"><span class="pre">*.pth</span></code> files (see the <a class="reference internal" href="site.html#module-site" title="site: Module responsible for site-specific configuration."><code class="xref py py-mod docutils literal notranslate"><span class="pre">site</span></code></a> module for more information), except that it doesn’t special-case lines starting with <code class="docutils literal notranslate"><span class="pre">import</span></code>. A <code class="file docutils literal notranslate"><span class="pre">*.pkg</span></code> file is trusted at face value: apart from checking for duplicates, all entries found in a <code class="file docutils literal notranslate"><span class="pre">*.pkg</span></code> file are added to the path, regardless of whether they exist on the filesystem. (This is a feature.)</p> <p>If the input path is not a list (as is the case for frozen packages) it is returned unchanged. The input path is not modified; an extended copy is returned. Items are only appended to the copy at the end.</p> <p>It is assumed that <a class="reference internal" href="sys.html#sys.path" title="sys.path"><code class="xref py py-data docutils literal notranslate"><span class="pre">sys.path</span></code></a> is a sequence. Items of <a class="reference internal" href="sys.html#sys.path" title="sys.path"><code class="xref py py-data docutils literal notranslate"><span class="pre">sys.path</span></code></a> that are not strings referring to existing directories are ignored. Unicode items on <a class="reference internal" href="sys.html#sys.path" title="sys.path"><code class="xref py py-data docutils literal notranslate"><span class="pre">sys.path</span></code></a> that cause errors when used as filenames may cause this function to raise an exception (in line with <a class="reference internal" href="os.path.html#os.path.isdir" title="os.path.isdir"><code class="xref py py-func docutils literal notranslate"><span class="pre">os.path.isdir()</span></code></a> behavior).</p> </dd></dl> <dl class="py class"> <dt class="sig sig-object py" id="pkgutil.ImpImporter"> <em class="property"><span class="pre">class</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">pkgutil.</span></span><span class="sig-name descname"><span class="pre">ImpImporter</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">dirname</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pkgutil.ImpImporter" title="Permalink to this definition">¶</a></dt> <dd><p><span class="target" id="index-0"></span><a class="pep reference external" href="https://www.python.org/dev/peps/pep-0302"><strong>PEP 302</strong></a> Finder that wraps Python’s “classic” import algorithm.</p> <p>If <em>dirname</em> is a string, a <span class="target" id="index-1"></span><a class="pep reference external" href="https://www.python.org/dev/peps/pep-0302"><strong>PEP 302</strong></a> finder is created that searches that directory. If <em>dirname</em> is <code class="docutils literal notranslate"><span class="pre">None</span></code>, a <span class="target" id="index-2"></span><a class="pep reference external" href="https://www.python.org/dev/peps/pep-0302"><strong>PEP 302</strong></a> finder is created that searches the current <a class="reference internal" href="sys.html#sys.path" title="sys.path"><code class="xref py py-data docutils literal notranslate"><span class="pre">sys.path</span></code></a>, plus any modules that are frozen or built-in.</p> <p>Note that <a class="reference internal" href="#pkgutil.ImpImporter" title="pkgutil.ImpImporter"><code class="xref py py-class docutils literal notranslate"><span class="pre">ImpImporter</span></code></a> does not currently support being used by placement on <a class="reference internal" href="sys.html#sys.meta_path" title="sys.meta_path"><code class="xref py py-data docutils literal notranslate"><span class="pre">sys.meta_path</span></code></a>.</p> <div class="deprecated"> <p><span class="versionmodified deprecated">Deprecated since version 3.3: </span>This emulation is no longer needed, as the standard import mechanism is now fully <span class="target" id="index-3"></span><a class="pep reference external" href="https://www.python.org/dev/peps/pep-0302"><strong>PEP 302</strong></a> compliant and available in <a class="reference internal" href="importlib.html#module-importlib" title="importlib: The implementation of the import machinery."><code class="xref py py-mod docutils literal notranslate"><span class="pre">importlib</span></code></a>.</p> </div> </dd></dl> <dl class="py class"> <dt class="sig sig-object py" id="pkgutil.ImpLoader"> <em class="property"><span class="pre">class</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">pkgutil.</span></span><span class="sig-name descname"><span class="pre">ImpLoader</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">fullname</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">file</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">filename</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">etc</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pkgutil.ImpLoader" title="Permalink to this definition">¶</a></dt> <dd><p><a class="reference internal" href="../glossary.html#term-loader"><span class="xref std std-term">Loader</span></a> that wraps Python’s “classic” import algorithm.</p> <div class="deprecated"> <p><span class="versionmodified deprecated">Deprecated since version 3.3: </span>This emulation is no longer needed, as the standard import mechanism is now fully <span class="target" id="index-4"></span><a class="pep reference external" href="https://www.python.org/dev/peps/pep-0302"><strong>PEP 302</strong></a> compliant and available in <a class="reference internal" href="importlib.html#module-importlib" title="importlib: The implementation of the import machinery."><code class="xref py py-mod docutils literal notranslate"><span class="pre">importlib</span></code></a>.</p> </div> </dd></dl> <dl class="py function"> <dt class="sig sig-object py" id="pkgutil.find_loader"> <span class="sig-prename descclassname"><span class="pre">pkgutil.</span></span><span class="sig-name descname"><span class="pre">find_loader</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">fullname</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pkgutil.find_loader" title="Permalink to this definition">¶</a></dt> <dd><p>Retrieve a module <a class="reference internal" href="../glossary.html#term-loader"><span class="xref std std-term">loader</span></a> for the given <em>fullname</em>.</p> <p>This is a backwards compatibility wrapper around <a class="reference internal" href="importlib.html#importlib.util.find_spec" title="importlib.util.find_spec"><code class="xref py py-func docutils literal notranslate"><span class="pre">importlib.util.find_spec()</span></code></a> that converts most failures to <a class="reference internal" href="exceptions.html#ImportError" title="ImportError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ImportError</span></code></a> and only returns the loader rather than the full <code class="xref py py-class docutils literal notranslate"><span class="pre">ModuleSpec</span></code>.</p> <div class="versionchanged"> <p><span class="versionmodified changed">Changed in version 3.3: </span>Updated to be based directly on <a class="reference internal" href="importlib.html#module-importlib" title="importlib: The implementation of the import machinery."><code class="xref py py-mod docutils literal notranslate"><span class="pre">importlib</span></code></a> rather than relying on the package internal <span class="target" id="index-5"></span><a class="pep reference external" href="https://www.python.org/dev/peps/pep-0302"><strong>PEP 302</strong></a> import emulation.</p> </div> <div class="versionchanged"> <p><span class="versionmodified changed">Changed in version 3.4: </span>Updated to be based on <span class="target" id="index-6"></span><a class="pep reference external" href="https://www.python.org/dev/peps/pep-0451"><strong>PEP 451</strong></a></p> </div> </dd></dl> <dl class="py function"> <dt class="sig sig-object py" id="pkgutil.get_importer"> <span class="sig-prename descclassname"><span class="pre">pkgutil.</span></span><span class="sig-name descname"><span class="pre">get_importer</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">path_item</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pkgutil.get_importer" title="Permalink to this definition">¶</a></dt> <dd><p>Retrieve a <a class="reference internal" href="../glossary.html#term-finder"><span class="xref std std-term">finder</span></a> for the given <em>path_item</em>.</p> <p>The returned finder is cached in <a class="reference internal" href="sys.html#sys.path_importer_cache" title="sys.path_importer_cache"><code class="xref py py-data docutils literal notranslate"><span class="pre">sys.path_importer_cache</span></code></a> if it was newly created by a path hook.</p> <p>The cache (or part of it) can be cleared manually if a rescan of <a class="reference internal" href="sys.html#sys.path_hooks" title="sys.path_hooks"><code class="xref py py-data docutils literal notranslate"><span class="pre">sys.path_hooks</span></code></a> is necessary.</p> <div class="versionchanged"> <p><span class="versionmodified changed">Changed in version 3.3: </span>Updated to be based directly on <a class="reference internal" href="importlib.html#module-importlib" title="importlib: The implementation of the import machinery."><code class="xref py py-mod docutils literal notranslate"><span class="pre">importlib</span></code></a> rather than relying on the package internal <span class="target" id="index-7"></span><a class="pep reference external" href="https://www.python.org/dev/peps/pep-0302"><strong>PEP 302</strong></a> import emulation.</p> </div> </dd></dl> <dl class="py function"> <dt class="sig sig-object py" id="pkgutil.get_loader"> <span class="sig-prename descclassname"><span class="pre">pkgutil.</span></span><span class="sig-name descname"><span class="pre">get_loader</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">module_or_name</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pkgutil.get_loader" title="Permalink to this definition">¶</a></dt> <dd><p>Get a <a class="reference internal" href="../glossary.html#term-loader"><span class="xref std std-term">loader</span></a> object for <em>module_or_name</em>.</p> <p>If the module or package is accessible via the normal import mechanism, a wrapper around the relevant part of that machinery is returned. Returns <code class="docutils literal notranslate"><span class="pre">None</span></code> if the module cannot be found or imported. If the named module is not already imported, its containing package (if any) is imported, in order to establish the package <code class="docutils literal notranslate"><span class="pre">__path__</span></code>.</p> <div class="versionchanged"> <p><span class="versionmodified changed">Changed in version 3.3: </span>Updated to be based directly on <a class="reference internal" href="importlib.html#module-importlib" title="importlib: The implementation of the import machinery."><code class="xref py py-mod docutils literal notranslate"><span class="pre">importlib</span></code></a> rather than relying on the package internal <span class="target" id="index-8"></span><a class="pep reference external" href="https://www.python.org/dev/peps/pep-0302"><strong>PEP 302</strong></a> import emulation.</p> </div> <div class="versionchanged"> <p><span class="versionmodified changed">Changed in version 3.4: </span>Updated to be based on <span class="target" id="index-9"></span><a class="pep reference external" href="https://www.python.org/dev/peps/pep-0451"><strong>PEP 451</strong></a></p> </div> </dd></dl> <dl class="py function"> <dt class="sig sig-object py" id="pkgutil.iter_importers"> <span class="sig-prename descclassname"><span class="pre">pkgutil.</span></span><span class="sig-name descname"><span class="pre">iter_importers</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">fullname</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">''</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pkgutil.iter_importers" title="Permalink to this definition">¶</a></dt> <dd><p>Yield <a class="reference internal" href="../glossary.html#term-finder"><span class="xref std std-term">finder</span></a> objects for the given module name.</p> <p>If fullname contains a <code class="docutils literal notranslate"><span class="pre">'.'</span></code>, the finders will be for the package containing fullname, otherwise they will be all registered top level finders (i.e. those on both <a class="reference internal" href="sys.html#sys.meta_path" title="sys.meta_path"><code class="xref py py-data docutils literal notranslate"><span class="pre">sys.meta_path</span></code></a> and <a class="reference internal" href="sys.html#sys.path_hooks" title="sys.path_hooks"><code class="xref py py-data docutils literal notranslate"><span class="pre">sys.path_hooks</span></code></a>).</p> <p>If the named module is in a package, that package is imported as a side effect of invoking this function.</p> <p>If no module name is specified, all top level finders are produced.</p> <div class="versionchanged"> <p><span class="versionmodified changed">Changed in version 3.3: </span>Updated to be based directly on <a class="reference internal" href="importlib.html#module-importlib" title="importlib: The implementation of the import machinery."><code class="xref py py-mod docutils literal notranslate"><span class="pre">importlib</span></code></a> rather than relying on the package internal <span class="target" id="index-10"></span><a class="pep reference external" href="https://www.python.org/dev/peps/pep-0302"><strong>PEP 302</strong></a> import emulation.</p> </div> </dd></dl> <dl class="py function"> <dt class="sig sig-object py" id="pkgutil.iter_modules"> <span class="sig-prename descclassname"><span class="pre">pkgutil.</span></span><span class="sig-name descname"><span class="pre">iter_modules</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">path</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">prefix</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">''</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pkgutil.iter_modules" title="Permalink to this definition">¶</a></dt> <dd><p>Yields <a class="reference internal" href="#pkgutil.ModuleInfo" title="pkgutil.ModuleInfo"><code class="xref py py-class docutils literal notranslate"><span class="pre">ModuleInfo</span></code></a> for all submodules on <em>path</em>, or, if <em>path</em> is <code class="docutils literal notranslate"><span class="pre">None</span></code>, all top-level modules on <a class="reference internal" href="sys.html#sys.path" title="sys.path"><code class="xref py py-data docutils literal notranslate"><span class="pre">sys.path</span></code></a>.</p> <p><em>path</em> should be either <code class="docutils literal notranslate"><span class="pre">None</span></code> or a list of paths to look for modules in.</p> <p><em>prefix</em> is a string to output on the front of every module name on output.</p> <div class="admonition note"> <p class="admonition-title">Note</p> <p>Only works for a <a class="reference internal" href="../glossary.html#term-finder"><span class="xref std std-term">finder</span></a> which defines an <code class="docutils literal notranslate"><span class="pre">iter_modules()</span></code> method. This interface is non-standard, so the module also provides implementations for <a class="reference internal" href="importlib.html#importlib.machinery.FileFinder" title="importlib.machinery.FileFinder"><code class="xref py py-class docutils literal notranslate"><span class="pre">importlib.machinery.FileFinder</span></code></a> and <a class="reference internal" href="zipimport.html#zipimport.zipimporter" title="zipimport.zipimporter"><code class="xref py py-class docutils literal notranslate"><span class="pre">zipimport.zipimporter</span></code></a>.</p> </div> <div class="versionchanged"> <p><span class="versionmodified changed">Changed in version 3.3: </span>Updated to be based directly on <a class="reference internal" href="importlib.html#module-importlib" title="importlib: The implementation of the import machinery."><code class="xref py py-mod docutils literal notranslate"><span class="pre">importlib</span></code></a> rather than relying on the package internal <span class="target" id="index-11"></span><a class="pep reference external" href="https://www.python.org/dev/peps/pep-0302"><strong>PEP 302</strong></a> import emulation.</p> </div> </dd></dl> <dl class="py function"> <dt class="sig sig-object py" id="pkgutil.walk_packages"> <span class="sig-prename descclassname"><span class="pre">pkgutil.</span></span><span class="sig-name descname"><span class="pre">walk_packages</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">path</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">prefix</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">''</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">onerror</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pkgutil.walk_packages" title="Permalink to this definition">¶</a></dt> <dd><p>Yields <a class="reference internal" href="#pkgutil.ModuleInfo" title="pkgutil.ModuleInfo"><code class="xref py py-class docutils literal notranslate"><span class="pre">ModuleInfo</span></code></a> for all modules recursively on <em>path</em>, or, if <em>path</em> is <code class="docutils literal notranslate"><span class="pre">None</span></code>, all accessible modules.</p> <p><em>path</em> should be either <code class="docutils literal notranslate"><span class="pre">None</span></code> or a list of paths to look for modules in.</p> <p><em>prefix</em> is a string to output on the front of every module name on output.</p> <p>Note that this function must import all <em>packages</em> (<em>not</em> all modules!) on the given <em>path</em>, in order to access the <code class="docutils literal notranslate"><span class="pre">__path__</span></code> attribute to find submodules.</p> <p><em>onerror</em> is a function which gets called with one argument (the name of the package which was being imported) if any exception occurs while trying to import a package. If no <em>onerror</em> function is supplied, <a class="reference internal" href="exceptions.html#ImportError" title="ImportError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ImportError</span></code></a>s are caught and ignored, while all other exceptions are propagated, terminating the search.</p> <p>Examples:</p> <div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="c1"># list all modules python can access</span> <span class="n">walk_packages</span><span class="p">()</span> <span class="c1"># list all submodules of ctypes</span> <span class="n">walk_packages</span><span class="p">(</span><span class="n">ctypes</span><span class="o">.</span><span class="n">__path__</span><span class="p">,</span> <span class="n">ctypes</span><span class="o">.</span><span class="vm">__name__</span> <span class="o">+</span> <span class="s1">'.'</span><span class="p">)</span> </pre></div> </div> <div class="admonition note"> <p class="admonition-title">Note</p> <p>Only works for a <a class="reference internal" href="../glossary.html#term-finder"><span class="xref std std-term">finder</span></a> which defines an <code class="docutils literal notranslate"><span class="pre">iter_modules()</span></code> method. This interface is non-standard, so the module also provides implementations for <a class="reference internal" href="importlib.html#importlib.machinery.FileFinder" title="importlib.machinery.FileFinder"><code class="xref py py-class docutils literal notranslate"><span class="pre">importlib.machinery.FileFinder</span></code></a> and <a class="reference internal" href="zipimport.html#zipimport.zipimporter" title="zipimport.zipimporter"><code class="xref py py-class docutils literal notranslate"><span class="pre">zipimport.zipimporter</span></code></a>.</p> </div> <div class="versionchanged"> <p><span class="versionmodified changed">Changed in version 3.3: </span>Updated to be based directly on <a class="reference internal" href="importlib.html#module-importlib" title="importlib: The implementation of the import machinery."><code class="xref py py-mod docutils literal notranslate"><span class="pre">importlib</span></code></a> rather than relying on the package internal <span class="target" id="index-12"></span><a class="pep reference external" href="https://www.python.org/dev/peps/pep-0302"><strong>PEP 302</strong></a> import emulation.</p> </div> </dd></dl> <dl class="py function"> <dt class="sig sig-object py" id="pkgutil.get_data"> <span class="sig-prename descclassname"><span class="pre">pkgutil.</span></span><span class="sig-name descname"><span class="pre">get_data</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">package</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">resource</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pkgutil.get_data" title="Permalink to this definition">¶</a></dt> <dd><p>Get a resource from a package.</p> <p>This is a wrapper for the <a class="reference internal" href="../glossary.html#term-loader"><span class="xref std std-term">loader</span></a> <a class="reference internal" href="importlib.html#importlib.abc.ResourceLoader.get_data" title="importlib.abc.ResourceLoader.get_data"><code class="xref py py-meth docutils literal notranslate"><span class="pre">get_data</span></code></a> API. The <em>package</em> argument should be the name of a package, in standard module format (<code class="docutils literal notranslate"><span class="pre">foo.bar</span></code>). The <em>resource</em> argument should be in the form of a relative filename, using <code class="docutils literal notranslate"><span class="pre">/</span></code> as the path separator. The parent directory name <code class="docutils literal notranslate"><span class="pre">..</span></code> is not allowed, and nor is a rooted name (starting with a <code class="docutils literal notranslate"><span class="pre">/</span></code>).</p> <p>The function returns a binary string that is the contents of the specified resource.</p> <p>For packages located in the filesystem, which have already been imported, this is the rough equivalent of:</p> <div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="n">d</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">dirname</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">modules</span><span class="p">[</span><span class="n">package</span><span class="p">]</span><span class="o">.</span><span class="vm">__file__</span><span class="p">)</span> <span class="n">data</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">d</span><span class="p">,</span> <span class="n">resource</span><span class="p">),</span> <span class="s1">'rb'</span><span class="p">)</span><span class="o">.</span><span class="n">read</span><span class="p">()</span> </pre></div> </div> <p>If the package cannot be located or loaded, or it uses a <a class="reference internal" href="../glossary.html#term-loader"><span class="xref std std-term">loader</span></a> which does not support <a class="reference internal" href="importlib.html#importlib.abc.ResourceLoader.get_data" title="importlib.abc.ResourceLoader.get_data"><code class="xref py py-meth docutils literal notranslate"><span class="pre">get_data</span></code></a>, then <code class="docutils literal notranslate"><span class="pre">None</span></code> is returned. In particular, the <a class="reference internal" href="../glossary.html#term-loader"><span class="xref std std-term">loader</span></a> for <a class="reference internal" href="../glossary.html#term-namespace-package"><span class="xref std std-term">namespace packages</span></a> does not support <a class="reference internal" href="importlib.html#importlib.abc.ResourceLoader.get_data" title="importlib.abc.ResourceLoader.get_data"><code class="xref py py-meth docutils literal notranslate"><span class="pre">get_data</span></code></a>.</p> </dd></dl> <dl class="py function"> <dt class="sig sig-object py" id="pkgutil.resolve_name"> <span class="sig-prename descclassname"><span class="pre">pkgutil.</span></span><span class="sig-name descname"><span class="pre">resolve_name</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">name</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pkgutil.resolve_name" title="Permalink to this definition">¶</a></dt> <dd><p>Resolve a name to an object.</p> <p>This functionality is used in numerous places in the standard library (see <a class="reference external" href="https://bugs.python.org/issue?@action=redirect&bpo=12915">bpo-12915</a>) - and equivalent functionality is also in widely used third-party packages such as setuptools, Django and Pyramid.</p> <p>It is expected that <em>name</em> will be a string in one of the following formats, where W is shorthand for a valid Python identifier and dot stands for a literal period in these pseudo-regexes:</p> <ul class="simple"> <li><p><code class="docutils literal notranslate"><span class="pre">W(.W)*</span></code></p></li> <li><p><code class="docutils literal notranslate"><span class="pre">W(.W)*:(W(.W)*)?</span></code></p></li> </ul> <p>The first form is intended for backward compatibility only. It assumes that some part of the dotted name is a package, and the rest is an object somewhere within that package, possibly nested inside other objects. Because the place where the package stops and the object hierarchy starts can’t be inferred by inspection, repeated attempts to import must be done with this form.</p> <p>In the second form, the caller makes the division point clear through the provision of a single colon: the dotted name to the left of the colon is a package to be imported, and the dotted name to the right is the object hierarchy within that package. Only one import is needed in this form. If it ends with the colon, then a module object is returned.</p> <p>The function will return an object (which might be a module), or raise one of the following exceptions:</p> <p><a class="reference internal" href="exceptions.html#ValueError" title="ValueError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ValueError</span></code></a> – if <em>name</em> isn’t in a recognised format.</p> <p><a class="reference internal" href="exceptions.html#ImportError" title="ImportError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ImportError</span></code></a> – if an import failed when it shouldn’t have.</p> <p><a class="reference internal" href="exceptions.html#AttributeError" title="AttributeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">AttributeError</span></code></a> – If a failure occurred when traversing the object hierarchy within the imported package to get to the desired object.</p> <div class="versionadded"> <p><span class="versionmodified added">New in version 3.9.</span></p> </div> </dd></dl> </section> <div class="clearer"></div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="zipimport.html" title="previous chapter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">zipimport</span></code> — Import modules from Zip archives</a></p> <h4>Next topic</h4> <p class="topless"><a href="modulefinder.html" title="next chapter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">modulefinder</span></code> — Find modules used by a script</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/pkgutil.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="modulefinder.html" title="modulefinder — Find modules used by a script" >next</a> |</li> <li class="right" > <a href="zipimport.html" title="zipimport — Import modules from Zip archives" >previous</a> |</li> <li><img src="../_static/py.svg" alt="python logo" style="vertical-align: middle; 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="modules.html" >Importing Modules</a> »</li> <li class="nav-item nav-item-this"><a href=""><code class="xref py py-mod docutils literal notranslate"><span class="pre">pkgutil</span></code> — Package extension utility</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="footer"> © <a href="../copyright.html">Copyright</a> 2001-2026, Python Software Foundation. <br /> This page is licensed under the Python Software Foundation License Version 2. <br /> Examples, recipes, and other code in the documentation are additionally licensed under the Zero Clause BSD License. <br /> See <a href="/license.html">History and License</a> for more information.<br /> <br /> The Python Software Foundation is a non-profit corporation. <a href="https://www.python.org/psf/donations/">Please donate.</a> <br /> <br /> Last updated on January 26, 2026. <a href="/bugs.html">Found a bug</a>? <br /> Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 4.3.2. </div> </body> </html>
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