ss="sd">Most classes inherit from the abstract base classes Named, Associative, Directional, Membered, Valued contained in abstract.py. </span>

<span class="sd">The abstract module contains the following classes:</span>

<span class="sd">Named</span>
<span class="sd">-----</span>

<span class="sd">Base class for most other sg classes, representing objects with copy and same methods.</span>

<span class="sd">Associative</span>
<span class="sd">-----------</span>

<span class="sd">Associative class that obje