an class="special">==</span> <span class="number">0</span><span class="special">:</span>
  <span class="identifier">mpi</span><span class="special">.</span><span class="identifier">world</span><span class="special">.</span><span class="identifier">send</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="number">0</span><span class="special">,</span> <span class="string">'Hello'</span><span class="special">)</span>
  <span class="identifier">msg</span>