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<a class="reference internal" href="events.html#sqlalchemy.orm.events.SessionEvents" title="sqlalchemy.orm.events.SessionEvents"><tt class="xref py py-class docutils literal"><span class="pre">SessionEvents</span></tt></a>.</p>
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<p>Subclasses may be installed into a <a class="reference internal" href="session.html#sqlalchemy.orm.session.Session" title="sqlalchemy.orm.session.Session"><tt class="xref py py-class docutils literal"><span class="pre">Session</span></tt></a> (or
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<a class="reference internal" href="session.html#sqlalchemy.orm.session.sessionmaker" title="sqlalchemy.orm.session.sessionmaker"><tt class="xref py py-func docutils literal"><span class="pre">sessionmaker()</span></tt></a>) using the <tt class="docutils literal"><span class="pre">extension</span></tt> keyword
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<a class="reference internal" href="session.html#sqlalchemy.orm.session.sessionmaker" title="sqlalchemy.orm.session.sessionmaker"><tt class="xref py py-class docutils literal"><span class="pre">sessionmaker</span></tt></a>) using the <tt class="docutils literal"><span class="pre">extension</span></tt> keyword
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<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">sqlalchemy.orm.interfaces</span> <span class="kn">import</span> <span class="n">SessionExtension</span>