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You should install the python3 and python3-doc packages and read the <a href="file:///usr/share/doc/python3-doc/html/library/bastion.html"> Python documentation for the Python3 version packaged in this release</a>. </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" accesskey="I">index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="modules.html" title="31. 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(deprecated)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Bastion</span></code></a> — Restricting access to objects<a class="headerlink" href="#module-Bastion" title="Permalink to this headline">¶</a></h1> <div class="deprecated"> <p><span class="versionmodified">Deprecated since version 2.6: </span>The <a class="reference internal" href="#module-Bastion" title="Bastion: Providing restricted access to objects. (deprecated)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">Bastion</span></code></a> module has been removed in Python 3.</p> </div> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.3: </span>Disabled module.</p> </div> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">The documentation has been left in place to help in reading old code that uses the module.</p> </div> <p>According to the dictionary, a bastion is “a fortified area or position”, or “something that is considered a stronghold.” It’s a suitable name for this module, which provides a way to forbid access to certain attributes of an object. It must always be used with the <a class="reference internal" href="rexec.html#module-rexec" title="rexec: Basic restricted execution framework. (deprecated)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">rexec</span></code></a> module, in order to allow restricted-mode programs access to certain safe attributes of an object, while denying access to other, unsafe attributes.</p> <dl class="function"> <dt id="Bastion.Bastion"> <code class="descclassname">Bastion.</code><code class="descname">Bastion</code><span class="sig-paren">(</span><em>object</em><span class="optional">[</span>, <em>filter</em><span class="optional">[</span>, <em>name</em><span class="optional">[</span>, <em>class</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#Bastion.Bastion" title="Permalink to this definition">¶</a></dt> <dd><p>Protect the object <em>object</em>, returning a bastion for the object. Any attempt to access one of the object’s attributes will have to be approved by the <em>filter</em> function; if the access is denied an <a class="reference internal" href="exceptions.html#exceptions.AttributeError" title="exceptions.AttributeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">AttributeError</span></code></a> exception will be raised.</p> <p>If present, <em>filter</em> must be a function that accepts a string containing an attribute name, and returns true if access to that attribute will be permitted; if <em>filter</em> returns false, the access is denied. The default filter denies access to any function beginning with an underscore (<code class="docutils literal notranslate"><span class="pre">'_'</span></code>). The bastion’s string representation will be <code class="docutils literal notranslate"><span class="pre"><Bastion</span> <span class="pre">for</span> <span class="pre">name></span></code> if a value for <em>name</em> is provided; otherwise, <code class="docutils literal notranslate"><span class="pre">repr(object)</span></code> will be used.</p> <p><em>class</em>, if present, should be a subclass of <a class="reference internal" href="#Bastion.BastionClass" title="Bastion.BastionClass"><code class="xref py py-class docutils literal notranslate"><span class="pre">BastionClass</span></code></a>; see the code in <code class="file docutils literal notranslate"><span class="pre">bastion.py</span></code> for the details. Overriding the default <a class="reference internal" href="#Bastion.BastionClass" title="Bastion.BastionClass"><code class="xref py py-class docutils literal notranslate"><span class="pre">BastionClass</span></code></a> will rarely be required.</p> </dd></dl> <dl class="class"> <dt id="Bastion.BastionClass"> <em class="property">class </em><code class="descclassname">Bastion.</code><code class="descname">BastionClass</code><span class="sig-paren">(</span><em>getfunc</em>, <em>name</em><span class="sig-paren">)</span><a class="headerlink" href="#Bastion.BastionClass" title="Permalink to this definition">¶</a></dt> <dd><p>Class which actually implements bastion objects. This is the default class used by <a class="reference internal" href="#module-Bastion" title="Bastion: Providing restricted access to objects. (deprecated)"><code class="xref py py-func docutils literal notranslate"><span class="pre">Bastion()</span></code></a>. The <em>getfunc</em> parameter is a function which returns the value of an attribute which should be exposed to the restricted execution environment when called with the name of the attribute as the only parameter. <em>name</em> is used to construct the <a class="reference internal" href="functions.html#repr" title="repr"><code class="xref py py-func docutils literal notranslate"><span class="pre">repr()</span></code></a> of the <a class="reference internal" href="#Bastion.BastionClass" title="Bastion.BastionClass"><code class="xref py py-class docutils literal notranslate"><span class="pre">BastionClass</span></code></a> instance.</p> </dd></dl> </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="rexec.html" title="previous chapter">30.1. <code class="docutils literal notranslate"><span class="pre">rexec</span></code> — Restricted execution framework</a></p> <h4>Next topic</h4> <p class="topless"><a href="modules.html" title="next chapter">31. 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