<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>django.contrib.gis.measure — Django 1.6.8 documentation</title> <link rel="stylesheet" href="../../../../_static/default.css" type="text/css" /> <link rel="stylesheet" href="../../../../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../../../../', VERSION: '1.6.8', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../../../../_static/jquery.js"></script> <script type="text/javascript" src="../../../../_static/underscore.js"></script> <script type="text/javascript" src="../../../../_static/doctools.js"></script> <link rel="top" title="Django 1.6.8 documentation" href="../../../../index.html" /> <link rel="up" title="Module code" href="../../../index.html" /> <script type="text/javascript" src="../../../../templatebuiltins.js"></script> <script type="text/javascript"> (function($) { if (!django_template_builtins) { // templatebuiltins.js missing, do nothing. return; } $(document).ready(function() { // Hyperlink Django template tags and filters var base = "../../../../ref/templates/builtins.html"; if (base == "#") { // Special case for builtins.html itself base = ""; } // Tags are keywords, class '.k' $("div.highlight\\-html\\+django span.k").each(function(i, elem) { var tagname = $(elem).text(); if ($.inArray(tagname, django_template_builtins.ttags) != -1) { var fragment = tagname.replace(/_/, '-'); $(elem).html("<a href='" + base + "#" + fragment + "'>" + tagname + "</a>"); } }); // Filters are functions, class '.nf' $("div.highlight\\-html\\+django span.nf").each(function(i, elem) { var filtername = $(elem).text(); if ($.inArray(filtername, django_template_builtins.tfilters) != -1) { var fragment = filtername.replace(/_/, '-'); $(elem).html("<a href='" + base + "#" + fragment + "'>" + filtername + "</a>"); } }); }); })(jQuery); </script> </head> <body> <div class="document"> <div id="custom-doc" class="yui-t6"> <div id="hd"> <h1><a href="../../../../index.html">Django 1.6.8 documentation</a></h1> <div id="global-nav"> <a title="Home page" href="../../../../index.html">Home</a> | <a title="Table of contents" href="../../../../contents.html">Table of contents</a> | <a title="Global index" href="../../../../genindex.html">Index</a> | <a title="Module index" href="../../../../py-modindex.html">Modules</a> </div> <div class="nav"> <a href="../../../index.html" title="Module code" accesskey="U">up</a></div> </div> <div id="bd"> <div id="yui-main"> <div class="yui-b"> <div class="yui-g" id="_modules-django-contrib-gis-measure"> <h1>Source code for django.contrib.gis.measure</h1><div class="highlight"><pre> <span class="c"># Copyright (c) 2007, Robert Coup <robert.coup@onetrackmind.co.nz></span> <span class="c"># All rights reserved.</span> <span class="c">#</span> <span class="c"># Redistribution and use in source and binary forms, with or without modification,</span> <span class="c"># are permitted provided that the following conditions are met:</span> <span class="c">#</span> <span class="c"># 1. Redistributions of source code must retain the above copyright notice,</span> <span class="c"># this list of conditions and the following disclaimer.</span> <span class="c">#</span> <span class="c"># 2. Redistributions in binary form must reproduce the above copyright</span> <span class="c"># notice, this list of conditions and the following disclaimer in the</span> <span class="c"># documentation and/or other materials provided with the distribution.</span> <span class="c">#</span> <span class="c"># 3. Neither the name of Distance nor the names of its contributors may be used</span> <span class="c"># to endorse or promote products derived from this software without</span> <span class="c"># specific prior written permission.</span> <span class="c">#</span> <span class="c"># THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND</span> <span class="c"># ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED</span> <span class="c"># WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE</span> <span class="c"># DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR</span> <span class="c"># ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES</span> <span class="c"># (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;</span> <span class="c"># LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON</span> <span class="c"># ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span> <span class="c"># (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS</span> <span class="c"># SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span> <span class="c">#</span> <span class="sd">"""</span> <span class="sd">Distance and Area objects to allow for sensible and convienient calculation</span> <span class="sd">and conversions.</span> <span class="sd">Authors: Robert Coup, Justin Bronn, Riccardo Di Virgilio</span> <span class="sd">Inspired by GeoPy (http://exogen.case.edu/projects/geopy/)</span> <span class="sd">and Geoff Biggs' PhD work on dimensioned units for robotics.</span> <span class="sd">"""</span> <span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span><span class="s">'A'</span><span class="p">,</span> <span class="s">'Area'</span><span class="p">,</span> <span class="s">'D'</span><span class="p">,</span> <span class="s">'Distance'</span><span class="p">]</span> <span class="kn">from</span> <span class="nn">decimal</span> <span class="kn">import</span> <span class="n">Decimal</span> <span class="kn">from</span> <span class="nn">django.utils.functional</span> <span class="kn">import</span> <span class="n">total_ordering</span> <span class="kn">from</span> <span class="nn">django.utils</span> <span class="kn">import</span> <span class="n">six</span> <span class="n">NUMERIC_TYPES</span> <span class="o">=</span> <span class="n">six</span><span class="o">.</span><span class="n">integer_types</span> <span class="o">+</span> <span class="p">(</span><span class="nb">float</span><span class="p">,</span> <span class="n">Decimal</span><span class="p">)</span> <span class="n">AREA_PREFIX</span> <span class="o">=</span> <span class="s">"sq_"</span> <span class="k">def</span> <span class="nf">pretty_name</span><span class="p">(</span><span class="n">obj</span><span class="p">):</span> <span class="k">return</span> <span class="n">obj</span><span class="o">.</span><span class="n">__name__</span> <span class="k">if</span> <span class="n">obj</span><span class="o">.</span><span class="n">__class__</span> <span class="o">==</span> <span class="nb">type</span> <span class="k">else</span> <span class="n">obj</span><span class="o">.</span><span class="n">__class__</span><span class="o">.</span><span class="n">__name__</span> <span class="nd">@total_ordering</span> <span class="k">class</span> <span class="nc">MeasureBase</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span> <span class="n">STANDARD_UNIT</span> <span class="o">=</span> <span class="bp">None</span> <span class="n">ALIAS</span> <span class="o">=</span> <span class="p">{}</span> <span class="n">UNITS</span> <span class="o">=</span> <span class="p">{}</span> <span class="n">LALIAS</span> <span class="o">=</span> <span class="p">{}</span> <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">default_unit</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span> <span class="n">value</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_default_unit</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">default_units</span><span class="p">(</span><span class="n">kwargs</span><span class="p">)</span> <span class="nb">setattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">STANDARD_UNIT</span><span class="p">,</span> <span class="n">value</span><span class="p">)</span> <span class="k">if</span> <span class="n">default_unit</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">default_unit</span><span class="p">,</span> <span class="n">six</span><span class="o">.</span><span class="n">string_types</span><span class="p">):</span> <span class="bp">self</span><span class="o">.</span><span class="n">_default_unit</span> <span class="o">=</span> <span class="n">default_unit</span> <span class="k">def</span> <span class="nf">_get_standard</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="k">return</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">STANDARD_UNIT</span><span class="p">)</span> <span class="k">def</span> <span class="nf">_set_standard</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span> <span class="nb">setattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">STANDARD_UNIT</span><span class="p">,</span> <span class="n">value</span><span class="p">)</span> <span class="n">standard</span> <span class="o">=</span> <span class="nb">property</span><span class="p">(</span><span class="n">_get_standard</span><span class="p">,</span> <span class="n">_set_standard</span><span class="p">)</span> <span class="k">def</span> <span class="nf">__getattr__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">):</span> <span class="k">if</span> <span class="n">name</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">UNITS</span><span class="p">:</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">standard</span> <span class="o">/</span> <span class="bp">self</span><span class="o">.</span><span class="n">UNITS</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="k">else</span><span class="p">:</span> <span class="k">raise</span> <span class="ne">AttributeError</span><span class="p">(</span><span class="s">'Unknown unit type: </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="n">name</span><span class="p">)</span> <span class="k">def</span> <span class="nf">__repr__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="k">return</span> <span class="s">'</span><span class="si">%s</span><span class="s">(</span><span class="si">%s</span><span class="s">=</span><span class="si">%s</span><span class="s">)'</span> <span class="o">%</span> <span class="p">(</span><span class="n">pretty_name</span><span class="p">(</span><span class="bp">self</span><span class="p">),</span> <span class="bp">self</span><span class="o">.</span><span class="n">_default_unit</span><span class="p">,</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_default_unit</span><span class="p">))</span> <span class="k">def</span> <span class="nf">__str__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="k">return</span> <span class="s">'</span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_default_unit</span><span class="p">),</span> <span class="bp">self</span><span class="o">.</span><span class="n">_default_unit</span><span class="p">)</span> <span class="c"># **** Comparison methods ****</span> <span class="k">def</span> <span class="nf">__eq__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">__class__</span><span class="p">):</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">standard</span> <span class="o">==</span> <span class="n">other</span><span class="o">.</span><span class="n">standard</span> <span class="k">else</span><span class="p">:</span> <span class="k">return</span> <span class="bp">NotImplemented</span> <span class="k">def</span> <span class="nf">__lt__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">__class__</span><span class="p">):</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">standard</span> <span class="o"><</span> <span class="n">other</span><span class="o">.</span><span class="n">standard</span> <span class="k">else</span><span class="p">:</span> <span class="k">return</span> <span class="bp">NotImplemented</span> <span class="c"># **** Operators methods ****</span> <span class="k">def</span> <span class="nf">__add__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">__class__</span><span class="p">):</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">__class__</span><span class="p">(</span><span class="n">default_unit</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">_default_unit</span><span class="p">,</span> <span class="o">**</span><span class="p">{</span><span class="bp">self</span><span class="o">.</span><span class="n">STANDARD_UNIT</span><span class="p">:</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">standard</span> <span class="o">+</span> <span class="n">other</span><span class="o">.</span><span class="n">standard</span><span class="p">)})</span> <span class="k">else</span><span class="p">:</span> <span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s">'</span><span class="si">%(class)s</span><span class="s"> must be added with </span><span class="si">%(class)s</span><span class="s">'</span> <span class="o">%</span> <span class="p">{</span><span class="s">"class"</span><span class="p">:</span><span class="n">pretty_name</span><span class="p">(</span><span class="bp">self</span><span class="p">)})</span> <span class="k">def</span> <span class="nf">__iadd__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">__class__</span><span class="p">):</span> <span class="bp">self</span><span class="o">.</span><span class="n">standard</span> <span class="o">+=</span> <span class="n">other</span><span class="o">.</span><span class="n">standard</span> <span class="k">return</span> <span class="bp">self</span> <span class="k">else</span><span class="p">:</span> <span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s">'</span><span class="si">%(class)s</span><span class="s"> must be added with </span><span class="si">%(class)s</span><span class="s">'</span> <span class="o">%</span> <span class="p">{</span><span class="s">"class"</span><span class="p">:</span><span class="n">pretty_name</span><span class="p">(</span><span class="bp">self</span><span class="p">)})</span> <span class="k">def</span> <span class="nf">__sub__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">__class__</span><span class="p">):</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">__class__</span><span class="p">(</span><span class="n">default_unit</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">_default_unit</span><span class="p">,</span> <span class="o">**</span><span class="p">{</span><span class="bp">self</span><span class="o">.</span><span class="n">STANDARD_UNIT</span><span class="p">:</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">standard</span> <span class="o">-</span> <span class="n">other</span><span class="o">.</span><span class="n">standard</span><span class="p">)})</span> <span class="k">else</span><span class="p">:</span> <span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s">'</span><span class="si">%(class)s</span><span class="s"> must be subtracted from </span><span class="si">%(class)s</span><span class="s">'</span> <span class="o">%</span> <span class="p">{</span><span class="s">"class"</span><span class="p">:</span><span class="n">pretty_name</span><span class="p">(</span><span class="bp">self</span><span class="p">)})</span> <span class="k">def</span> <span class="nf">__isub__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">__class__</span><span class="p">):</span> <span class="bp">self</span><span class="o">.</span><span class="n">standard</span> <span class="o">-=</span> <span class="n">other</span><span class="o">.</span><span class="n">standard</span> <span class="k">return</span> <span class="bp">self</span> <span class="k">else</span><span class="p">:</span> <span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s">'</span><span class="si">%(class)s</span><span class="s"> must be subtracted from </span><span class="si">%(class)s</span><span class="s">'</span> <span class="o">%</span> <span class="p">{</span><span class="s">"class"</span><span class="p">:</span><span class="n">pretty_name</span><span class="p">(</span><span class="bp">self</span><span class="p">)})</span> <span class="k">def</span> <span class="nf">__mul__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="n">NUMERIC_TYPES</span><span class="p">):</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">__class__</span><span class="p">(</span><span class="n">default_unit</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">_default_unit</span><span class="p">,</span> <span class="o">**</span><span class="p">{</span><span class="bp">self</span><span class="o">.</span><span class="n">STANDARD_UNIT</span><span class="p">:</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">standard</span> <span class="o">*</span> <span class="n">other</span><span class="p">)})</span> <span class="k">else</span><span class="p">:</span> <span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s">'</span><span class="si">%(class)s</span><span class="s"> must be multiplied with number'</span> <span class="o">%</span> <span class="p">{</span><span class="s">"class"</span><span class="p">:</span><span class="n">pretty_name</span><span class="p">(</span><span class="bp">self</span><span class="p">)})</span> <span class="k">def</span> <span class="nf">__imul__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="n">NUMERIC_TYPES</span><span class="p">):</span> <span class="bp">self</span><span class="o">.</span><span class="n">standard</span> <span class="o">*=</span> <span class="nb">float</span><span class="p">(</span><span class="n">other</span><span class="p">)</span> <span class="k">return</span> <span class="bp">self</span> <span class="k">else</span><span class="p">:</span> <span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s">'</span><span class="si">%(class)s</span><span class="s"> must be multiplied with number'</span> <span class="o">%</span> <span class="p">{</span><span class="s">"class"</span><span class="p">:</span><span class="n">pretty_name</span><span class="p">(</span><span class="bp">self</span><span class="p">)})</span> <span class="k">def</span> <span class="nf">__rmul__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span> <span class="k">return</span> <span class="bp">self</span> <span class="o">*</span> <span class="n">other</span> <span class="k">def</span> <span class="nf">__truediv__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">__class__</span><span class="p">):</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">standard</span> <span class="o">/</span> <span class="n">other</span><span class="o">.</span><span class="n">standard</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="n">NUMERIC_TYPES</span><span class="p">):</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">__class__</span><span class="p">(</span><span class="n">default_unit</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">_default_unit</span><span class="p">,</span> <span class="o">**</span><span class="p">{</span><span class="bp">self</span><span class="o">.</span><span class="n">STANDARD_UNIT</span><span class="p">:</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">standard</span> <span class="o">/</span> <span class="n">other</span><span class="p">)})</span> <span class="k">else</span><span class="p">:</span> <span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s">'</span><span class="si">%(class)s</span><span class="s"> must be divided with number or </span><span class="si">%(class)s</span><span class="s">'</span> <span class="o">%</span> <span class="p">{</span><span class="s">"class"</span><span class="p">:</span><span class="n">pretty_name</span><span class="p">(</span><span class="bp">self</span><span class="p">)})</span> <span class="k">def</span> <span class="nf">__div__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span> <span class="c"># Python 2 compatibility</span> <span class="k">return</span> <span class="nb">type</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">__truediv__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">)</span> <span class="k">def</span> <span class="nf">__itruediv__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="n">NUMERIC_TYPES</span><span class="p">):</span> <span class="bp">self</span><span class="o">.</span><span class="n">standard</span> <span class="o">/=</span> <span class="nb">float</span><span class="p">(</span><span class="n">other</span><span class="p">)</span> <span class="k">return</span> <span class="bp">self</span> <span class="k">else</span><span class="p">:</span> <span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s">'</span><span class="si">%(class)s</span><span class="s"> must be divided with number'</span> <span class="o">%</span> <span class="p">{</span><span class="s">"class"</span><span class="p">:</span><span class="n">pretty_name</span><span class="p">(</span><span class="bp">self</span><span class="p">)})</span> <span class="k">def</span> <span class="nf">__idiv__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span> <span class="c"># Python 2 compatibility</span> <span class="k">return</span> <span class="nb">type</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">__itruediv__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">)</span> <span class="k">def</span> <span class="nf">__bool__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="k">return</span> <span class="nb">bool</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">standard</span><span class="p">)</span> <span class="k">def</span> <span class="nf">__nonzero__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="c"># Python 2 compatibility</span> <span class="k">return</span> <span class="nb">type</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">__bool__</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="k">def</span> <span class="nf">default_units</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">kwargs</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> Return the unit value and the default units specified</span> <span class="sd"> from the given keyword arguments dictionary.</span> <span class="sd"> """</span> <span class="n">val</span> <span class="o">=</span> <span class="mf">0.0</span> <span class="n">default_unit</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">STANDARD_UNIT</span> <span class="k">for</span> <span class="n">unit</span><span class="p">,</span> <span class="n">value</span> <span class="ow">in</span> <span class="n">six</span><span class="o">.</span><span class="n">iteritems</span><span class="p">(</span><span class="n">kwargs</span><span class="p">):</span> <span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="nb">float</span><span class="p">):</span> <span class="n">value</span> <span class="o">=</span> <span class="nb">float</span><span class="p">(</span><span class="n">value</span><span class="p">)</span> <span class="k">if</span> <span class="n">unit</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">UNITS</span><span class="p">:</span> <span class="n">val</span> <span class="o">+=</span> <span class="bp">self</span><span class="o">.</span><span class="n">UNITS</span><span class="p">[</span><span class="n">unit</span><span class="p">]</span> <span class="o">*</span> <span class="n">value</span> <span class="n">default_unit</span> <span class="o">=</span> <span class="n">unit</span> <span class="k">elif</span> <span class="n">unit</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">ALIAS</span><span class="p">:</span> <span class="n">u</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">ALIAS</span><span class="p">[</span><span class="n">unit</span><span class="p">]</span> <span class="n">val</span> <span class="o">+=</span> <span class="bp">self</span><span class="o">.</span><span class="n">UNITS</span><span class="p">[</span><span class="n">u</span><span class="p">]</span> <span class="o">*</span> <span class="n">value</span> <span class="n">default_unit</span> <span class="o">=</span> <span class="n">u</span> <span class="k">else</span><span class="p">:</span> <span class="n">lower</span> <span class="o">=</span> <span class="n">unit</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span> <span class="k">if</span> <span class="n">lower</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">UNITS</span><span class="p">:</span> <span class="n">val</span> <span class="o">+=</span> <span class="bp">self</span><span class="o">.</span><span class="n">UNITS</span><span class="p">[</span><span class="n">lower</span><span class="p">]</span> <span class="o">*</span> <span class="n">value</span> <span class="n">default_unit</span> <span class="o">=</span> <span class="n">lower</span> <span class="k">elif</span> <span class="n">lower</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">LALIAS</span><span class="p">:</span> <span class="n">u</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">LALIAS</span><span class="p">[</span><span class="n">lower</span><span class="p">]</span> <span class="n">val</span> <span class="o">+=</span> <span class="bp">self</span><span class="o">.</span><span class="n">UNITS</span><span class="p">[</span><span class="n">u</span><span class="p">]</span> <span class="o">*</span> <span class="n">value</span> <span class="n">default_unit</span> <span class="o">=</span> <span class="n">u</span> <span class="k">else</span><span class="p">:</span> <span class="k">raise</span> <span class="ne">AttributeError</span><span class="p">(</span><span class="s">'Unknown unit type: </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="n">unit</span><span class="p">)</span> <span class="k">return</span> <span class="n">val</span><span class="p">,</span> <span class="n">default_unit</span> <span class="nd">@classmethod</span> <span class="k">def</span> <span class="nf">unit_attname</span><span class="p">(</span><span class="n">cls</span><span class="p">,</span> <span class="n">unit_str</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> Retrieves the unit attribute name for the given unit string.</span> <span class="sd"> For example, if the given unit string is 'metre', 'm' would be returned.</span> <span class="sd"> An exception is raised if an attribute cannot be found.</span> <span class="sd"> """</span> <span class="n">lower</span> <span class="o">=</span> <span class="n">unit_str</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span> <span class="k">if</span> <span class="n">unit_str</span> <span class="ow">in</span> <span class="n">cls</span><span class="o">.</span><span class="n">UNITS</span><span class="p">:</span> <span class="k">return</span> <span class="n">unit_str</span> <span class="k">elif</span> <span class="n">lower</span> <span class="ow">in</span> <span class="n">cls</span><span class="o">.</span><span class="n">UNITS</span><span class="p">:</span> <span class="k">return</span> <span class="n">lower</span> <span class="k">elif</span> <span class="n">lower</span> <span class="ow">in</span> <span class="n">cls</span><span class="o">.</span><span class="n">LALIAS</span><span class="p">:</span> <span class="k">return</span> <span class="n">cls</span><span class="o">.</span><span class="n">LALIAS</span><span class="p">[</span><span class="n">lower</span><span class="p">]</span> <span class="k">else</span><span class="p">:</span> <span class="k">raise</span> <span class="ne">Exception</span><span class="p">(</span><span class="s">'Could not find a unit keyword associated with "</span><span class="si">%s</span><span class="s">"'</span> <span class="o">%</span> <span class="n">unit_str</span><span class="p">)</span> <div class="viewcode-block" id="Distance"><a class="viewcode-back" href="../../../../ref/contrib/gis/measure.html#django.contrib.gis.measure.Distance">[docs]</a><span class="k">class</span> <span class="nc">Distance</span><span class="p">(</span><span class="n">MeasureBase</span><span class="p">):</span> <span class="n">STANDARD_UNIT</span> <span class="o">=</span> <span class="s">"m"</span> <span class="n">UNITS</span> <span class="o">=</span> <span class="p">{</span> <span class="s">'chain'</span> <span class="p">:</span> <span class="mf">20.1168</span><span class="p">,</span> <span class="s">'chain_benoit'</span> <span class="p">:</span> <span class="mf">20.116782</span><span class="p">,</span> <span class="s">'chain_sears'</span> <span class="p">:</span> <span class="mf">20.1167645</span><span class="p">,</span> <span class="s">'british_chain_benoit'</span> <span class="p">:</span> <span class="mf">20.1167824944</span><span class="p">,</span> <span class="s">'british_chain_sears'</span> <span class="p">:</span> <span class="mf">20.1167651216</span><span class="p">,</span> <span class="s">'british_chain_sears_truncated'</span> <span class="p">:</span> <span class="mf">20.116756</span><span class="p">,</span> <span class="s">'cm'</span> <span class="p">:</span> <span class="mf">0.01</span><span class="p">,</span> <span class="s">'british_ft'</span> <span class="p">:</span> <span class="mf">0.304799471539</span><span class="p">,</span> <span class="s">'british_yd'</span> <span class="p">:</span> <span class="mf">0.914398414616</span><span class="p">,</span> <span class="s">'clarke_ft'</span> <span class="p">:</span> <span class="mf">0.3047972654</span><span class="p">,</span> <span class="s">'clarke_link'</span> <span class="p">:</span> <span class="mf">0.201166195164</span><span class="p">,</span> <span class="s">'fathom'</span> <span class="p">:</span> <span class="mf">1.8288</span><span class="p">,</span> <span class="s">'ft'</span><span class="p">:</span> <span class="mf">0.3048</span><span class="p">,</span> <span class="s">'german_m'</span> <span class="p">:</span> <span class="mf">1.0000135965</span><span class="p">,</span> <span class="s">'gold_coast_ft'</span> <span class="p">:</span> <span class="mf">0.304799710181508</span><span class="p">,</span> <span class="s">'indian_yd'</span> <span class="p">:</span> <span class="mf">0.914398530744</span><span class="p">,</span> <span class="s">'inch'</span> <span class="p">:</span> <span class="mf">0.0254</span><span class="p">,</span> <span class="s">'km'</span><span class="p">:</span> <span class="mf">1000.0</span><span class="p">,</span> <span class="s">'link'</span> <span class="p">:</span> <span class="mf">0.201168</span><span class="p">,</span> <span class="s">'link_benoit'</span> <span class="p">:</span> <span class="mf">0.20116782</span><span class="p">,</span> <span class="s">'link_sears'</span> <span class="p">:</span> <span class="mf">0.20116765</span><span class="p">,</span> <span class="s">'m'</span><span class="p">:</span> <span class="mf">1.0</span><span class="p">,</span> <span class="s">'mi'</span><span class="p">:</span> <span class="mf">1609.344</span><span class="p">,</span> <span class="s">'mm'</span> <span class="p">:</span> <span class="mf">0.001</span><span class="p">,</span> <span class="s">'nm'</span><span class="p">:</span> <span class="mf">1852.0</span><span class="p">,</span> <span class="s">'nm_uk'</span> <span class="p">:</span> <span class="mf">1853.184</span><span class="p">,</span> <span class="s">'rod'</span> <span class="p">:</span> <span class="mf">5.0292</span><span class="p">,</span> <span class="s">'sears_yd'</span> <span class="p">:</span> <span class="mf">0.91439841</span><span class="p">,</span> <span class="s">'survey_ft'</span> <span class="p">:</span> <span class="mf">0.304800609601</span><span class="p">,</span> <span class="s">'um'</span> <span class="p">:</span> <span class="mf">0.000001</span><span class="p">,</span> <span class="s">'yd'</span><span class="p">:</span> <span class="mf">0.9144</span><span class="p">,</span> <span class="p">}</span> <span class="c"># Unit aliases for `UNIT` terms encountered in Spatial Reference WKT.</span> <span class="n">ALIAS</span> <span class="o">=</span> <span class="p">{</span> <span class="s">'centimeter'</span> <span class="p">:</span> <span class="s">'cm'</span><span class="p">,</span> <span class="s">'foot'</span> <span class="p">:</span> <span class="s">'ft'</span><span class="p">,</span> <span class="s">'inches'</span> <span class="p">:</span> <span class="s">'inch'</span><span class="p">,</span> <span class="s">'kilometer'</span> <span class="p">:</span> <span class="s">'km'</span><span class="p">,</span> <span class="s">'kilometre'</span> <span class="p">:</span> <span class="s">'km'</span><span class="p">,</span> <span class="s">'meter'</span> <span class="p">:</span> <span class="s">'m'</span><span class="p">,</span> <span class="s">'metre'</span> <span class="p">:</span> <span class="s">'m'</span><span class="p">,</span> <span class="s">'micrometer'</span> <span class="p">:</span> <span class="s">'um'</span><span class="p">,</span> <span class="s">'micrometre'</span> <span class="p">:</span> <span class="s">'um'</span><span class="p">,</span> <span class="s">'millimeter'</span> <span class="p">:</span> <span class="s">'mm'</span><span class="p">,</span> <span class="s">'millimetre'</span> <span class="p">:</span> <span class="s">'mm'</span><span class="p">,</span> <span class="s">'mile'</span> <span class="p">:</span> <span class="s">'mi'</span><span class="p">,</span> <span class="s">'yard'</span> <span class="p">:</span> <span class="s">'yd'</span><span class="p">,</span> <span class="s">'British chain (Benoit 1895 B)'</span> <span class="p">:</span> <span class="s">'british_chain_benoit'</span><span class="p">,</span> <span class="s">'British chain (Sears 1922)'</span> <span class="p">:</span> <span class="s">'british_chain_sears'</span><span class="p">,</span> <span class="s">'British chain (Sears 1922 truncated)'</span> <span class="p">:</span> <span class="s">'british_chain_sears_truncated'</span><span class="p">,</span> <span class="s">'British foot (Sears 1922)'</span> <span class="p">:</span> <span class="s">'british_ft'</span><span class="p">,</span> <span class="s">'British foot'</span> <span class="p">:</span> <span class="s">'british_ft'</span><span class="p">,</span> <span class="s">'British yard (Sears 1922)'</span> <span class="p">:</span> <span class="s">'british_yd'</span><span class="p">,</span> <span class="s">'British yard'</span> <span class="p">:</span> <span class="s">'british_yd'</span><span class="p">,</span> <span class="s">"Clarke's Foot"</span> <span class="p">:</span> <span class="s">'clarke_ft'</span><span class="p">,</span> <span class="s">"Clarke's link"</span> <span class="p">:</span> <span class="s">'clarke_link'</span><span class="p">,</span> <span class="s">'Chain (Benoit)'</span> <span class="p">:</span> <span class="s">'chain_benoit'</span><span class="p">,</span> <span class="s">'Chain (Sears)'</span> <span class="p">:</span> <span class="s">'chain_sears'</span><span class="p">,</span> <span class="s">'Foot (International)'</span> <span class="p">:</span> <span class="s">'ft'</span><span class="p">,</span> <span class="s">'German legal metre'</span> <span class="p">:</span> <span class="s">'german_m'</span><span class="p">,</span> <span class="s">'Gold Coast foot'</span> <span class="p">:</span> <span class="s">'gold_coast_ft'</span><span class="p">,</span> <span class="s">'Indian yard'</span> <span class="p">:</span> <span class="s">'indian_yd'</span><span class="p">,</span> <span class="s">'Link (Benoit)'</span><span class="p">:</span> <span class="s">'link_benoit'</span><span class="p">,</span> <span class="s">'Link (Sears)'</span><span class="p">:</span> <span class="s">'link_sears'</span><span class="p">,</span> <span class="s">'Nautical Mile'</span> <span class="p">:</span> <span class="s">'nm'</span><span class="p">,</span> <span class="s">'Nautical Mile (UK)'</span> <span class="p">:</span> <span class="s">'nm_uk'</span><span class="p">,</span> <span class="s">'US survey foot'</span> <span class="p">:</span> <span class="s">'survey_ft'</span><span class="p">,</span> <span class="s">'U.S. Foot'</span> <span class="p">:</span> <span class="s">'survey_ft'</span><span class="p">,</span> <span class="s">'Yard (Indian)'</span> <span class="p">:</span> <span class="s">'indian_yd'</span><span class="p">,</span> <span class="s">'Yard (Sears)'</span> <span class="p">:</span> <span class="s">'sears_yd'</span> <span class="p">}</span> <span class="n">LALIAS</span> <span class="o">=</span> <span class="nb">dict</span><span class="p">([(</span><span class="n">k</span><span class="o">.</span><span class="n">lower</span><span class="p">(),</span> <span class="n">v</span><span class="p">)</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">ALIAS</span><span class="o">.</span><span class="n">items</span><span class="p">()])</span> <span class="k">def</span> <span class="nf">__mul__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">__class__</span><span class="p">):</span> <span class="k">return</span> <span class="n">Area</span><span class="p">(</span><span class="n">default_unit</span><span class="o">=</span><span class="n">AREA_PREFIX</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="n">_default_unit</span><span class="p">,</span> <span class="o">**</span><span class="p">{</span><span class="n">AREA_PREFIX</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="n">STANDARD_UNIT</span><span class="p">:</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">standard</span> <span class="o">*</span> <span class="n">other</span><span class="o">.</span><span class="n">standard</span><span class="p">)})</span> <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="n">NUMERIC_TYPES</span><span class="p">):</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">__class__</span><span class="p">(</span><span class="n">default_unit</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">_default_unit</span><span class="p">,</span> <span class="o">**</span><span class="p">{</span><span class="bp">self</span><span class="o">.</span><span class="n">STANDARD_UNIT</span><span class="p">:</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">standard</span> <span class="o">*</span> <span class="n">other</span><span class="p">)})</span> <span class="k">else</span><span class="p">:</span> <span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s">'</span><span class="si">%(distance)s</span><span class="s"> must be multiplied with number or </span><span class="si">%(distance)s</span><span class="s">'</span> <span class="o">%</span> <span class="p">{</span> <span class="s">"distance"</span> <span class="p">:</span> <span class="n">pretty_name</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">__class__</span><span class="p">),</span> <span class="p">})</span> </div> <div class="viewcode-block" id="Area"><a class="viewcode-back" href="../../../../ref/contrib/gis/measure.html#django.contrib.gis.measure.Area">[docs]</a><span class="k">class</span> <span class="nc">Area</span><span class="p">(</span><span class="n">MeasureBase</span><span class="p">):</span> <span class="n">STANDARD_UNIT</span> <span class="o">=</span> <span class="n">AREA_PREFIX</span> <span class="o">+</span> <span class="n">Distance</span><span class="o">.</span><span class="n">STANDARD_UNIT</span> <span class="c"># Getting the square units values and the alias dictionary.</span> <span class="n">UNITS</span> <span class="o">=</span> <span class="nb">dict</span><span class="p">([(</span><span class="s">'</span><span class="si">%s%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">AREA_PREFIX</span><span class="p">,</span> <span class="n">k</span><span class="p">),</span> <span class="n">v</span> <span class="o">**</span> <span class="mi">2</span><span class="p">)</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">Distance</span><span class="o">.</span><span class="n">UNITS</span><span class="o">.</span><span class="n">items</span><span class="p">()])</span> <span class="n">ALIAS</span> <span class="o">=</span> <span class="nb">dict</span><span class="p">([(</span><span class="n">k</span><span class="p">,</span> <span class="s">'</span><span class="si">%s%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">AREA_PREFIX</span><span class="p">,</span> <span class="n">v</span><span class="p">))</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">Distance</span><span class="o">.</span><span class="n">ALIAS</span><span class="o">.</span><span class="n">items</span><span class="p">()])</span> <span class="n">LALIAS</span> <span class="o">=</span> <span class="nb">dict</span><span class="p">([(</span><span class="n">k</span><span class="o">.</span><span class="n">lower</span><span class="p">(),</span> <span class="n">v</span><span class="p">)</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">ALIAS</span><span class="o">.</span><span class="n">items</span><span class="p">()])</span> <span class="k">def</span> <span class="nf">__truediv__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="n">NUMERIC_TYPES</span><span class="p">):</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">__class__</span><span class="p">(</span><span class="n">default_unit</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">_default_unit</span><span class="p">,</span> <span class="o">**</span><span class="p">{</span><span class="bp">self</span><span class="o">.</span><span class="n">STANDARD_UNIT</span><span class="p">:</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">standard</span> <span class="o">/</span> <span class="n">other</span><span class="p">)})</span> <span class="k">else</span><span class="p">:</span> <span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s">'</span><span class="si">%(class)s</span><span class="s"> must be divided by a number'</span> <span class="o">%</span> <span class="p">{</span><span class="s">"class"</span><span class="p">:</span><span class="n">pretty_name</span><span class="p">(</span><span class="bp">self</span><span class="p">)})</span> <span class="k">def</span> <span class="nf">__div__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span> <span class="c"># Python 2 compatibility</span> <span class="k">return</span> <span class="nb">type</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">__truediv__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">)</span> <span class="c"># Shortcuts</span></div> <span class="n">D</span> <span class="o">=</span> <span class="n">Distance</span> <span class="n">A</span> <span class="o">=</span> <span class="n">Area</span> </pre></div> </div> </div> </div> <div class="yui-b" id="sidebar"> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h3>Browse</h3> <ul> </ul> <h3>You are here:</h3> <ul> <li> <a href="../../../../index.html">Django 1.6.8 documentation</a> <ul><li><a href="../../../index.html">Module code</a> <ul><li>django.contrib.gis.measure</li></ul> </li></ul> </li> </ul> <div id="searchbox" style="display: none"> <h3>Quick search</h3> <form class="search" action="../../../../search.html" method="get"> <input type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> <p class="searchtip" 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