<!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" lang=""> <head> <meta http-equiv="X-UA-Compatible" content="IE=Edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>django.core.paginator — Django 1.11.20 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" id="documentation_options" data-url_root="../../../" src="../../../_static/documentation_options.js"></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> <script type="text/javascript" src="../../../_static/language_data.js"></script> <link rel="index" 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class="kn">import</span> <span class="nn">collections</span> <span class="kn">import</span> <span class="nn">warnings</span> <span class="kn">from</span> <span class="nn">math</span> <span class="k">import</span> <span class="n">ceil</span> <span class="kn">from</span> <span class="nn">django.utils</span> <span class="k">import</span> <span class="n">six</span> <span class="kn">from</span> <span class="nn">django.utils.functional</span> <span class="k">import</span> <span class="n">cached_property</span> <span class="kn">from</span> <span class="nn">django.utils.translation</span> <span class="k">import</span> <span class="n">ugettext_lazy</span> <span class="k">as</span> <span class="n">_</span> <span class="k">class</span> <span class="nc">UnorderedObjectListWarning</span><span class="p">(</span><span class="ne">RuntimeWarning</span><span class="p">):</span> <span class="k">pass</span> <div class="viewcode-block" id="InvalidPage"><a class="viewcode-back" href="../../../topics/pagination.html#django.contrib.admin.InvalidPage">[docs]</a><span class="k">class</span> <span class="nc">InvalidPage</span><span class="p">(</span><span class="ne">Exception</span><span class="p">):</span> <span class="k">pass</span></div> <div class="viewcode-block" id="PageNotAnInteger"><a class="viewcode-back" href="../../../topics/pagination.html#django.contrib.admin.PageNotAnInteger">[docs]</a><span class="k">class</span> <span class="nc">PageNotAnInteger</span><span class="p">(</span><span class="n">InvalidPage</span><span class="p">):</span> <span class="k">pass</span></div> <div class="viewcode-block" id="EmptyPage"><a class="viewcode-back" href="../../../topics/pagination.html#django.contrib.admin.EmptyPage">[docs]</a><span class="k">class</span> <span class="nc">EmptyPage</span><span class="p">(</span><span class="n">InvalidPage</span><span class="p">):</span> <span class="k">pass</span></div> <div class="viewcode-block" id="Paginator"><a class="viewcode-back" href="../../../topics/pagination.html#django.contrib.admin.Paginator">[docs]</a><span class="k">class</span> <span class="nc">Paginator</span><span class="p">(</span><span class="nb">object</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">object_list</span><span class="p">,</span> <span class="n">per_page</span><span class="p">,</span> <span class="n">orphans</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">allow_empty_first_page</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span> <span class="bp">self</span><span class="o">.</span><span class="n">object_list</span> <span class="o">=</span> <span class="n">object_list</span> <span class="bp">self</span><span class="o">.</span><span class="n">_check_object_list_is_ordered</span><span class="p">()</span> <span class="bp">self</span><span class="o">.</span><span class="n">per_page</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">per_page</span><span class="p">)</span> <span class="bp">self</span><span class="o">.</span><span class="n">orphans</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">orphans</span><span class="p">)</span> <span class="bp">self</span><span class="o">.</span><span class="n">allow_empty_first_page</span> <span class="o">=</span> <span class="n">allow_empty_first_page</span> <span class="k">def</span> <span class="nf">validate_number</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">number</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> Validates the given 1-based page number.</span> <span class="sd"> """</span> <span class="k">try</span><span class="p">:</span> <span class="n">number</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">number</span><span class="p">)</span> <span class="k">except</span> <span class="p">(</span><span class="ne">TypeError</span><span class="p">,</span> <span class="ne">ValueError</span><span class="p">):</span> <span class="k">raise</span> <span class="n">PageNotAnInteger</span><span class="p">(</span><span class="n">_</span><span class="p">(</span><span class="s1">'That page number is not an integer'</span><span class="p">))</span> <span class="k">if</span> <span class="n">number</span> <span class="o"><</span> <span class="mi">1</span><span class="p">:</span> <span class="k">raise</span> <span class="n">EmptyPage</span><span class="p">(</span><span class="n">_</span><span class="p">(</span><span class="s1">'That page number is less than 1'</span><span class="p">))</span> <span class="k">if</span> <span class="n">number</span> <span class="o">></span> <span class="bp">self</span><span class="o">.</span><span class="n">num_pages</span><span class="p">:</span> <span class="k">if</span> <span class="n">number</span> <span class="o">==</span> <span class="mi">1</span> <span class="ow">and</span> <span class="bp">self</span><span class="o">.</span><span class="n">allow_empty_first_page</span><span class="p">:</span> <span class="k">pass</span> <span class="k">else</span><span class="p">:</span> <span class="k">raise</span> <span class="n">EmptyPage</span><span class="p">(</span><span class="n">_</span><span class="p">(</span><span class="s1">'That page contains no results'</span><span class="p">))</span> <span class="k">return</span> <span class="n">number</span> <div class="viewcode-block" id="Paginator.page"><a class="viewcode-back" href="../../../topics/pagination.html#django.contrib.admin.Paginator.page">[docs]</a> <span class="k">def</span> <span class="nf">page</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">number</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> Returns a Page object for the given 1-based page number.</span> <span class="sd"> """</span> <span class="n">number</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">validate_number</span><span class="p">(</span><span class="n">number</span><span class="p">)</span> <span class="n">bottom</span> <span class="o">=</span> <span class="p">(</span><span class="n">number</span> <span class="o">-</span> <span class="mi">1</span><span class="p">)</span> <span class="o">*</span> <span class="bp">self</span><span class="o">.</span><span class="n">per_page</span> <span class="n">top</span> <span class="o">=</span> <span class="n">bottom</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="n">per_page</span> <span class="k">if</span> <span class="n">top</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="n">orphans</span> <span class="o">>=</span> <span class="bp">self</span><span class="o">.</span><span class="n">count</span><span class="p">:</span> <span class="n">top</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">count</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_get_page</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">object_list</span><span class="p">[</span><span class="n">bottom</span><span class="p">:</span><span class="n">top</span><span class="p">],</span> <span class="n">number</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span></div> <span class="k">def</span> <span class="nf">_get_page</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> Returns an instance of a single page.</span> <span class="sd"> This hook can be used by subclasses to use an alternative to the</span> <span class="sd"> standard :cls:`Page` object.</span> <span class="sd"> """</span> <span class="k">return</span> <span class="n">Page</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span> <span class="nd">@cached_property</span> <span class="k">def</span> <span class="nf">count</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> Returns the total number of objects, across all pages.</span> <span class="sd"> """</span> <span class="k">try</span><span class="p">:</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">object_list</span><span class="o">.</span><span class="n">count</span><span class="p">()</span> <span class="k">except</span> <span class="p">(</span><span class="ne">AttributeError</span><span class="p">,</span> <span class="ne">TypeError</span><span class="p">):</span> <span class="c1"># AttributeError if object_list has no count() method.</span> <span class="c1"># TypeError if object_list.count() requires arguments</span> <span class="c1"># (i.e. is of type list).</span> <span class="k">return</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">object_list</span><span class="p">)</span> <span class="nd">@cached_property</span> <span class="k">def</span> <span class="nf">num_pages</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> Returns the total number of pages.</span> <span class="sd"> """</span> <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">count</span> <span class="o">==</span> <span class="mi">0</span> <span class="ow">and</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">allow_empty_first_page</span><span class="p">:</span> <span class="k">return</span> <span class="mi">0</span> <span class="n">hits</span> <span class="o">=</span> <span class="nb">max</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">count</span> <span class="o">-</span> <span class="bp">self</span><span class="o">.</span><span class="n">orphans</span><span class="p">)</span> <span class="k">return</span> <span class="nb">int</span><span class="p">(</span><span class="n">ceil</span><span class="p">(</span><span class="n">hits</span> <span class="o">/</span> <span class="nb">float</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">per_page</span><span class="p">)))</span> <span class="nd">@property</span> <span class="k">def</span> <span class="nf">page_range</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> Returns a 1-based range of pages for iterating through within</span> <span class="sd"> a template for loop.</span> <span class="sd"> """</span> <span class="k">return</span> <span class="n">six</span><span class="o">.</span><span class="n">moves</span><span class="o">.</span><span class="n">range</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">num_pages</span> <span class="o">+</span> <span class="mi">1</span><span class="p">)</span> <span class="k">def</span> <span class="nf">_check_object_list_is_ordered</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> Warn if self.object_list is unordered (typically a QuerySet).</span> <span class="sd"> """</span> <span class="n">ordered</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">object_list</span><span class="p">,</span> <span class="s1">'ordered'</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> <span class="k">if</span> <span class="n">ordered</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">ordered</span><span class="p">:</span> <span class="n">obj_list_repr</span> <span class="o">=</span> <span class="p">(</span> <span class="s1">'</span><span class="si">{}</span><span class="s1"> </span><span class="si">{}</span><span class="s1">'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">object_list</span><span class="o">.</span><span class="n">model</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">object_list</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span><span class="p">)</span> <span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">object_list</span><span class="p">,</span> <span class="s1">'model'</span><span class="p">)</span> <span class="k">else</span> <span class="s1">'</span><span class="si">{!r}</span><span class="s1">'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">object_list</span><span class="p">)</span> <span class="p">)</span> <span class="n">warnings</span><span class="o">.</span><span class="n">warn</span><span class="p">(</span> <span class="s1">'Pagination may yield inconsistent results with an unordered '</span> <span class="s1">'object_list: </span><span class="si">{}</span><span class="s1">.'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">obj_list_repr</span><span class="p">),</span> <span class="n">UnorderedObjectListWarning</span><span class="p">,</span> <span class="n">stacklevel</span><span class="o">=</span><span class="mi">3</span> <span class="p">)</span></div> <span class="n">QuerySetPaginator</span> <span class="o">=</span> <span class="n">Paginator</span> <span class="c1"># For backwards-compatibility.</span> <div class="viewcode-block" id="Page"><a class="viewcode-back" href="../../../topics/pagination.html#django.contrib.admin.Page">[docs]</a><span class="k">class</span> <span class="nc">Page</span><span class="p">(</span><span class="n">collections</span><span class="o">.</span><span class="n">Sequence</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">object_list</span><span class="p">,</span> <span class="n">number</span><span class="p">,</span> <span class="n">paginator</span><span class="p">):</span> <span class="bp">self</span><span class="o">.</span><span class="n">object_list</span> <span class="o">=</span> <span class="n">object_list</span> <span class="bp">self</span><span class="o">.</span><span class="n">number</span> <span class="o">=</span> <span class="n">number</span> <span class="bp">self</span><span class="o">.</span><span class="n">paginator</span> <span class="o">=</span> <span class="n">paginator</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="s1">'<Page </span><span class="si">%s</span><span class="s1"> of </span><span class="si">%s</span><span class="s1">>'</span> <span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">number</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">paginator</span><span class="o">.</span><span class="n">num_pages</span><span class="p">)</span> <span class="k">def</span> <span class="nf">__len__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="k">return</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">object_list</span><span class="p">)</span> <span class="k">def</span> <span class="nf">__getitem__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">index</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">index</span><span class="p">,</span> <span class="p">(</span><span class="nb">slice</span><span class="p">,)</span> <span class="o">+</span> <span class="n">six</span><span class="o">.</span><span class="n">integer_types</span><span class="p">):</span> <span class="k">raise</span> <span class="ne">TypeError</span> <span class="c1"># The object_list is converted to a list so that if it was a QuerySet</span> <span class="c1"># it won't be a database hit per __getitem__.</span> <span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">object_list</span><span class="p">,</span> <span class="nb">list</span><span class="p">):</span> <span class="bp">self</span><span class="o">.</span><span class="n">object_list</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">object_list</span><span class="p">)</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">object_list</span><span class="p">[</span><span class="n">index</span><span class="p">]</span> <div class="viewcode-block" id="Page.has_next"><a class="viewcode-back" href="../../../topics/pagination.html#django.contrib.admin.Page.has_next">[docs]</a> <span class="k">def</span> <span class="nf">has_next</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">number</span> <span class="o"><</span> <span class="bp">self</span><span class="o">.</span><span class="n">paginator</span><span class="o">.</span><span class="n">num_pages</span></div> <div class="viewcode-block" id="Page.has_previous"><a class="viewcode-back" href="../../../topics/pagination.html#django.contrib.admin.Page.has_previous">[docs]</a> <span class="k">def</span> <span class="nf">has_previous</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">number</span> <span class="o">></span> <span class="mi">1</span></div> <div class="viewcode-block" id="Page.has_other_pages"><a class="viewcode-back" href="../../../topics/pagination.html#django.contrib.admin.Page.has_other_pages">[docs]</a> <span class="k">def</span> <span class="nf">has_other_pages</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">has_previous</span><span class="p">()</span> <span class="ow">or</span> <span class="bp">self</span><span class="o">.</span><span class="n">has_next</span><span class="p">()</span></div> <div class="viewcode-block" id="Page.next_page_number"><a class="viewcode-back" href="../../../topics/pagination.html#django.contrib.admin.Page.next_page_number">[docs]</a> <span class="k">def</span> <span class="nf">next_page_number</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">paginator</span><span class="o">.</span><span class="n">validate_number</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">number</span> <span class="o">+</span> <span class="mi">1</span><span class="p">)</span></div> <div class="viewcode-block" id="Page.previous_page_number"><a class="viewcode-back" href="../../../topics/pagination.html#django.contrib.admin.Page.previous_page_number">[docs]</a> <span class="k">def</span> <span class="nf">previous_page_number</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">paginator</span><span class="o">.</span><span class="n">validate_number</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">number</span> <span class="o">-</span> <span class="mi">1</span><span class="p">)</span></div> <div class="viewcode-block" id="Page.start_index"><a class="viewcode-back" href="../../../topics/pagination.html#django.contrib.admin.Page.start_index">[docs]</a> <span class="k">def</span> <span class="nf">start_index</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> Returns the 1-based index of the first object on this page,</span> <span class="sd"> relative to total objects in the paginator.</span> <span class="sd"> """</span> <span class="c1"># Special case, return zero if no items.</span> <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">paginator</span><span class="o">.</span><span class="n">count</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span> <span class="k">return</span> <span class="mi">0</span> <span class="k">return</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">paginator</span><span class="o">.</span><span class="n">per_page</span> <span class="o">*</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">number</span> <span class="o">-</span> <span class="mi">1</span><span class="p">))</span> <span class="o">+</span> <span class="mi">1</span></div> <div class="viewcode-block" id="Page.end_index"><a class="viewcode-back" href="../../../topics/pagination.html#django.contrib.admin.Page.end_index">[docs]</a> <span class="k">def</span> <span class="nf">end_index</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> Returns the 1-based index of the last object on this page,</span> <span class="sd"> relative to total objects found (hits).</span> <span class="sd"> """</span> <span class="c1"># Special case for the last page because there can be orphans.</span> <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">number</span> <span class="o">==</span> <span class="bp">self</span><span class="o">.</span><span class="n">paginator</span><span class="o">.</span><span class="n">num_pages</span><span class="p">:</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">paginator</span><span class="o">.</span><span class="n">count</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">number</span> <span class="o">*</span> <span class="bp">self</span><span class="o">.</span><span class="n">paginator</span><span class="o">.</span><span class="n">per_page</span></div></div> </pre></div> </div> </div> </div> <div class="yui-b" id="sidebar"> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <div id="searchbox" style="display: none" role="search"> <h3>Quick search</h3> <div class="searchformwrapper"> <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> </div> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <h3>Last update:</h3> <p class="topless">Feb 11, 2019</p> </div> </div> <div id="ft"> 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