 index_type to, size_type len
        );
</pre>
    <blockquote>
      <p>
        Most of these policies are self explanatory. <tt>However,
        <strong>convert_index</strong></tt> and
        <tt><strong>adjust_index</strong></tt> deserve some explanation.
      </p>
      <p>
        <strong><tt>convert_index</tt></strong> converts a Python index into
        a C++ index that the container can handle. For instance, negative
        indexes in Python, by convention, start counting from the right(e.g.
 