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<p><code class="docutils literal notranslate"><span class="pre">&lt;%def&gt;</span></code> and <code class="docutils literal notranslate"><span class="pre">&lt;%block&gt;</span></code> are two tags that both demarcate any block of text
and/or code.   They both exist within generated Python as a callable function,
i.e., a Python <code class="docutils literal notranslate"><span class="pre">def</span></code>.   They differ in their scope and calling semantics.
Whereas <c