<a name="L6"></a><tt class="py-lineno"> 6</tt> <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># This program is free software; you can redistribute it and/or</tt> </tt>
<a name="L7"></a><tt class="py-lineno"> 7</tt> <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># modify it under the terms of the GNU General Public License</tt> </tt>
<a name="L8"></a><tt class="py-lineno"> 8</tt> <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># as published by the Free Software Foundation; either version 2 </tt> </tt>
<a name="L9"></a><tt class="py-lineno"> 9</tt> <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># of the License, or (at your option) any later version.</tt> </tt>
<a name="L11"></a><tt class="py-lineno"> 11</tt> <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># This program is distributed in the hope that it will be useful,</tt> </tt>
<a name="L12"></a><tt class="py-lineno"> 12</tt> <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># but WITHOUT ANY WARRANTY; without even the implied warranty of</tt> </tt>
<a name="L13"></a><tt class="py-lineno"> 13</tt> <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</tt> </tt>
<a name="L14"></a><tt class="py-lineno"> 14</tt> <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># GNU General Public License for more details. </tt> </tt>
<a name="L16"></a><tt class="py-lineno"> 16</tt> <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># You should have received a copy of the GNU General Public License</tt> </tt>
<a name="L17"></a><tt class="py-lineno"> 17</tt> <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># along with this program; if not, write to the Free Software</tt> </tt>
<a name="L18"></a><tt class="py-lineno"> 18</tt> <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.</tt> </tt>
<a name="L22"></a><tt class="py-lineno"> 22</tt> <tt class="py-line"><tt class="py-docstring">(Data structures for stage 2 of the formatter)</tt> </tt>
</div><div id="Sum.__call__-collapsed" style="display:none;" pad="+++" indent="++++++++"></div><div id="Sum.__call__-expanded"><a name="L54"></a><tt class="py-lineno"> 54</tt> <tt class="py-line"> <tt class="py-comment"># The sum fails if one of the two members fails</tt> </tt>