s separation of the structure of an object from
        the data it stores, allowing the two pieces to be transmitted separately.
        This "skeleton/content" mechanism, described in more detail in
        a later section, is a communication optimization suitable for problems with
        fixed data structures whose internal data changes frequently.
      </p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="mpi.python_collectives"></a>Collectives</h3></div></div>