ynamically change the appearance of docstrings
          in the code that follows. The <code class="computeroutput"><span class="special">*</span><span class="identifier">_user_defined</span><span class="special">()</span></code>
          and <code class="computeroutput"><span class="special">*</span><span class="identifier">_signatures</span><span class="special">()</span></code> member functions are provided for fine-grained
          control. The <code class="computeroutput"><span class="special">*</spa