<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="X-UA-Compatible" content="IE=Edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>read_concern – Tools for working with read concern. — PyMongo 3.7.2 documentation</title> <link rel="stylesheet" href="../../_static/pydoctheme.css" type="text/css" /> <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" /> <script type="text/javascript" id="documentation_options" data-url_root="../../" src="../../_static/documentation_options.js"></script> <script type="text/javascript" src="../../_static/jquery.js"></script> <script type="text/javascript" src="../../_static/underscore.js"></script> <script type="text/javascript" src="../../_static/doctools.js"></script> <script type="text/javascript" src="../../_static/language_data.js"></script> <script type="text/javascript" src="../../_static/sidebar.js"></script> <link rel="index" title="Index" href="../../genindex.html" /> <link rel="search" title="Search" href="../../search.html" /> <link rel="next" title="read_preferences – Utilities for choosing which member of a replica set to read from." href="read_preferences.html" /> <link rel="prev" title="pool – Pool module for use with a MongoDB client." href="pool.html" /> </head><body> <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="read_preferences.html" title="read_preferences – Utilities for choosing which member of a replica set to read from." accesskey="N">next</a> |</li> <li class="right" > <a href="pool.html" title="pool – Pool module for use with a MongoDB client." accesskey="P">previous</a> |</li> <li class="nav-item nav-item-0"><a href="../../index.html">PyMongo 3.7.2 documentation</a> »</li> <li class="nav-item nav-item-1"><a href="../index.html" >API Documentation</a> »</li> <li class="nav-item nav-item-2"><a href="index.html" accesskey="U"><code class="docutils literal notranslate"><span class="pre">pymongo</span></code> – Python driver for MongoDB</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="module-pymongo.read_concern"> <span id="read-concern-tools-for-working-with-read-concern"></span><h1><code class="xref py py-mod docutils literal notranslate"><span class="pre">read_concern</span></code> – Tools for working with read concern.<a class="headerlink" href="#module-pymongo.read_concern" title="Permalink to this headline">¶</a></h1> <p>Tools for working with read concerns.</p> <dl class="class"> <dt id="pymongo.read_concern.ReadConcern"> <em class="property">class </em><code class="descclassname">pymongo.read_concern.</code><code class="descname">ReadConcern</code><span class="sig-paren">(</span><em>level=None</em><span class="sig-paren">)</span><a class="headerlink" href="#pymongo.read_concern.ReadConcern" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple"> <li><cite>level</cite>: (string) The read concern level specifies the level of isolation for read operations. For example, a read operation using a read concern level of <code class="docutils literal notranslate"><span class="pre">majority</span></code> will only return data that has been written to a majority of nodes. If the level is left unspecified, the server default will be used.</li> </ul> </td> </tr> </tbody> </table> <div class="versionadded"> <p><span class="versionmodified">New in version 3.2.</span></p> </div> <dl class="attribute"> <dt id="pymongo.read_concern.ReadConcern.document"> <code class="descname">document</code><a class="headerlink" href="#pymongo.read_concern.ReadConcern.document" title="Permalink to this definition">¶</a></dt> <dd><p>The document representation of this read concern.</p> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last"><a class="reference internal" href="#pymongo.read_concern.ReadConcern" title="pymongo.read_concern.ReadConcern"><code class="xref py py-class docutils literal notranslate"><span class="pre">ReadConcern</span></code></a> is immutable. Mutating the value of <a class="reference internal" href="#pymongo.read_concern.ReadConcern.document" title="pymongo.read_concern.ReadConcern.document"><code class="xref py py-attr docutils literal notranslate"><span class="pre">document</span></code></a> does not mutate this <a class="reference internal" href="#pymongo.read_concern.ReadConcern" title="pymongo.read_concern.ReadConcern"><code class="xref py py-class docutils literal notranslate"><span class="pre">ReadConcern</span></code></a>.</p> </div> </dd></dl> <dl class="attribute"> <dt id="pymongo.read_concern.ReadConcern.level"> <code class="descname">level</code><a class="headerlink" href="#pymongo.read_concern.ReadConcern.level" title="Permalink to this definition">¶</a></dt> <dd><p>The read concern level.</p> </dd></dl> <dl class="attribute"> <dt id="pymongo.read_concern.ReadConcern.ok_for_legacy"> <code class="descname">ok_for_legacy</code><a class="headerlink" href="#pymongo.read_concern.ReadConcern.ok_for_legacy" title="Permalink to this definition">¶</a></dt> <dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if this read concern is compatible with old wire protocol versions.</p> </dd></dl> </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="pool.html" title="previous chapter"><code class="docutils literal notranslate"><span class="pre">pool</span></code> – Pool module for use with a MongoDB client.</a></p> <h4>Next topic</h4> <p class="topless"><a href="read_preferences.html" title="next chapter"><code class="docutils literal notranslate"><span class="pre">read_preferences</span></code> – Utilities for choosing which member of a replica set to read from.</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../../_sources/api/pymongo/read_concern.rst.txt" rel="nofollow">Show Source</a></li> </ul> </div> <div id="searchbox" style="display: none" role="search"> <h3>Quick search</h3> <div class="searchformwrapper"> <form class="search" action="../../search.html" method="get"> <input 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> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </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="read_preferences.html" title="read_preferences – Utilities for choosing which member of a replica set to read from." >next</a> |</li> <li class="right" > <a href="pool.html" title="pool – Pool module for use with a MongoDB client." >previous</a> |</li> <li class="nav-item nav-item-0"><a href="../../index.html">PyMongo 3.7.2 documentation</a> »</li> <li class="nav-item nav-item-1"><a href="../index.html" >API Documentation</a> »</li> <li class="nav-item nav-item-2"><a href="index.html" ><code class="docutils literal notranslate"><span class="pre">pymongo</span></code> – Python driver for MongoDB</a> »</li> </ul> </div> <div class="footer" role="contentinfo"> © Copyright MongoDB, Inc. 2008-present. 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