lass="keyword">mod</span> y) &lt;= abs(y) - 1</code>.
   If <code class="code">y = 0</code>, <code class="code">x <span class="keyword">mod</span> y</code> raises <code class="code"><span class="constructor">Division_by_zero</span></code>.
   Note that <code class="code">x <span class="keyword">mod</span> y</code> is negative only if <code class="code">x &lt; 0</code>.
   Raise <code class="code"><span class="constructor">Division_by_zero</span></code> if <code class="code">y</code> is zero.<br>
</div>

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