>
    </span>
      <p class="shortcomment cmt"><code>Frame</code> is an immutable container for 2D data which is indexed along both axes
(rows, columns) by associated keys (i.e., indexes).</p><div class="fullcomment"><div class="comment cmt"><p><code>Frame</code> is an immutable container for 2D data which is indexed along both axes
(rows, columns) by associated keys (i.e., indexes).</p><p>The primary use case is homogeneous data, but a secondary concern is to support
heterogeneous data that is homogeneous