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<h1 id="collections-module">Collections Module</h1>
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Python</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-0-1"> 1</a></span>
<span class="normal"><a href="#__codelineno-0-2"> 2</a></span>
<span class="normal"><a href="#__codelineno-0-3"> 3</a></span>
<span class="normal"><a href="#__codelineno-0-4"> 4</a></span>
<span class="normal"><a href="#__codelineno-0-5"> 5</a></span>
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<span class="normal"><a href="#__codelineno-0-7"> 7</a></span>
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<span class="normal"><a href="#__codelineno-0-9"> 9</a></span>
<span class="normal"><a href="#__codelineno-0-10">10</a></span>
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<span class="normal"><a href="#__codelineno-0-16">16</a></span>
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<span class="normal"><a href="#__codelineno-0-18">18</a></span>
<span class="normal"><a href="#__codelineno-0-19">19</a></span>
<span class="normal"><a href="#__codelineno-0-20">20</a></span>
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<span class="normal"><a href="#__codelineno-0-22">22</a></span>
<span class="normal"><a href="#__codelineno-0-23">23</a></span>
<span class="normal"><a href="#__codelineno-0-24">24</a></span>
<span class="normal"><a href="#__codelineno-0-25">25</a></span>
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<span class="normal"><a href="#__codelineno-0-29">29</a></span>
<span class="normal"><a href="#__codelineno-0-30">30</a></span>
<span class="normal"><a href="#__codelineno-0-31">31</a></span>
<span class="normal"><a href="#__codelineno-0-32">32</a></span>
<span class="normal"><a href="#__codelineno-0-33">33</a></span>
<span class="normal"><a href="#__codelineno-0-34">34</a></span>
<span class="normal"><a href="#__codelineno-0-35">35</a></span>
<span class="normal"><a href="#__codelineno-0-36">36</a></span>
<span class="normal"><a href="#__codelineno-0-37">37</a></span>
<span class="normal"><a href="#__codelineno-0-38">38</a></span>
<span class="normal"><a href="#__codelineno-0-39">39</a></span>
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<span class="normal"><a href="#__codelineno-0-45">45</a></span>
<span class="normal"><a href="#__codelineno-0-46">46</a></span>
<span class="normal"><a href="#__codelineno-0-47">47</a></span>
<span class="normal"><a href="#__codelineno-0-48">48</a></span>
<span class="normal"><a href="#__codelineno-0-49">49</a></span>
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<span class="normal"><a href="#__codelineno-0-51">51</a></span>
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<span class="normal"><a href="#__codelineno-0-53">53</a></span>
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<span class="normal"><a href="#__codelineno-0-57">57</a></span>
<span class="normal"><a href="#__codelineno-0-58">58</a></span>
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<span class="normal"><a href="#__codelineno-0-60">60</a></span>
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<span class="normal"><a href="#__codelineno-0-63">63</a></span>
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<span class="normal"><a href="#__codelineno-0-65">65</a></span>
<span class="normal"><a href="#__codelineno-0-66">66</a></span>
<span class="normal"><a href="#__codelineno-0-67">67</a></span>
<span class="normal"><a href="#__codelineno-0-68">68</a></span>
<span class="normal"><a href="#__codelineno-0-69">69</a></span>
<span class="normal"><a href="#__codelineno-0-70">70</a></span>
<span class="normal"><a href="#__codelineno-0-71">71</a></span>
<span class="normal"><a href="#__codelineno-0-72">72</a></span>
<span class="normal"><a href="#__codelineno-0-73">73</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1"></a><span class="c1"># COUNTER ()</span>
<a id="__codelineno-0-2" name="__codelineno-0-2"></a><span class="c1"># subclass dictionary for counting hash-capable objects</span>
<a id="__codelineno-0-3" name="__codelineno-0-3"></a><span class="kn">from</span> <span class="nn">collections</span> <span class="kn">import</span> <span class="n">Counter</span>
<a id="__codelineno-0-4" name="__codelineno-0-4"></a><span class="n">Counter</span> <span class="p">(</span><span class="n">sequence</span><span class="p">)</span> <span class="c1"># -&gt; Counter object</span>
<a id="__codelineno-0-5" name="__codelineno-0-5"></a><span class="c1"># {item: num included in sequence, ...}</span>
<a id="__codelineno-0-6" name="__codelineno-0-6"></a>
<a id="__codelineno-0-7" name="__codelineno-0-7"></a><span class="n">var</span> <span class="o">=</span> <span class="n">Counter</span> <span class="p">(</span><span class="n">sequence</span><span class="p">)</span>
<a id="__codelineno-0-8" name="__codelineno-0-8"></a><span class="n">var</span><span class="o">.</span><span class="n">most_common</span> <span class="p">(</span><span class="n">n</span><span class="p">)</span> <span class="c1"># produce list of most common elements (most common n)</span>
<a id="__codelineno-0-9" name="__codelineno-0-9"></a><span class="nb">sum</span> <span class="p">(</span><span class="n">var</span><span class="o">.</span><span class="n">values</span> <span class="err"></span><span class="p">())</span> <span class="c1"># total of all counts</span>
<a id="__codelineno-0-10" name="__codelineno-0-10"></a><span class="n">var</span><span class="o">.</span><span class="n">clear</span> <span class="p">()</span> <span class="c1">#reset all counts</span>
<a id="__codelineno-0-11" name="__codelineno-0-11"></a><span class="nb">list</span> <span class="p">(</span><span class="n">var</span><span class="p">)</span> <span class="c1"># list unique items</span>
<a id="__codelineno-0-12" name="__codelineno-0-12"></a><span class="nb">set</span> <span class="p">(</span><span class="n">var</span><span class="p">)</span> <span class="c1"># convert to a set</span>
<a id="__codelineno-0-13" name="__codelineno-0-13"></a><span class="nb">dict</span> <span class="p">(</span><span class="n">var</span><span class="p">)</span> <span class="c1"># convert to regular dictionary</span>
<a id="__codelineno-0-14" name="__codelineno-0-14"></a><span class="n">var</span><span class="o">.</span><span class="n">items</span> <span class="p">()</span> <span class="c1"># convert to a list of pairs (element, count)</span>
<a id="__codelineno-0-15" name="__codelineno-0-15"></a><span class="n">Counter</span> <span class="p">(</span><span class="nb">dict</span> <span class="p">(</span><span class="n">list_of_pairs</span><span class="p">))</span> <span class="c1"># convert from a list of pairs</span>
<a id="__codelineno-0-16" name="__codelineno-0-16"></a><span class="n">var</span><span class="o">.</span><span class="n">most_common</span> <span class="p">[:</span> <span class="o">-</span> <span class="n">n</span><span class="o">-</span><span class="mi">1</span><span class="p">:</span> <span class="o">-</span><span class="mi">1</span><span class="p">]</span> <span class="c1"># n less common elements</span>
<a id="__codelineno-0-17" name="__codelineno-0-17"></a><span class="n">var</span> <span class="o">+</span> <span class="o">=</span> <span class="n">Counter</span> <span class="p">()</span> <span class="c1"># remove zero and negative counts</span>
<a id="__codelineno-0-18" name="__codelineno-0-18"></a>
<a id="__codelineno-0-19" name="__codelineno-0-19"></a>
<a id="__codelineno-0-20" name="__codelineno-0-20"></a><span class="c1"># DEFAULTDICT ()</span>
<a id="__codelineno-0-21" name="__codelineno-0-21"></a><span class="c1"># dictionary-like object that takes a default type as its first argument</span>
<a id="__codelineno-0-22" name="__codelineno-0-22"></a><span class="c1"># defaultdict will never raise a KeyError exception.</span>
<a id="__codelineno-0-23" name="__codelineno-0-23"></a><span class="c1"># non-existent keys return a default value (default_factory)</span>
<a id="__codelineno-0-24" name="__codelineno-0-24"></a><span class="kn">from</span> <span class="nn">collections</span> <span class="kn">import</span> <span class="n">defaultdict</span>
<a id="__codelineno-0-25" name="__codelineno-0-25"></a><span class="n">var</span> <span class="o">=</span> <span class="n">defaultdict</span> <span class="p">(</span><span class="n">default_factory</span><span class="p">)</span>
<a id="__codelineno-0-26" name="__codelineno-0-26"></a><span class="n">var</span><span class="o">.</span><span class="n">popitem</span> <span class="p">()</span> <span class="c1"># remove and return first element</span>
<a id="__codelineno-0-27" name="__codelineno-0-27"></a><span class="n">var</span><span class="o">.</span><span class="n">popitem</span> <span class="p">(</span><span class="n">last</span> <span class="o">=</span> <span class="kc">True</span><span class="p">)</span> <span class="c1"># remove and return last item</span>
<a id="__codelineno-0-28" name="__codelineno-0-28"></a>
<a id="__codelineno-0-29" name="__codelineno-0-29"></a>
<a id="__codelineno-0-30" name="__codelineno-0-30"></a><span class="c1"># OREDERDDICT ()</span>
<a id="__codelineno-0-31" name="__codelineno-0-31"></a><span class="c1"># subclass dictionary that &quot;remembers&quot; the order in which the contents are entered</span>
<a id="__codelineno-0-32" name="__codelineno-0-32"></a><span class="c1"># Normal dictionaries have random order</span>
<a id="__codelineno-0-33" name="__codelineno-0-33"></a><span class="n">name_dict</span> <span class="o">=</span> <span class="n">OrderedDict</span> <span class="p">()</span>
<a id="__codelineno-0-34" name="__codelineno-0-34"></a><span class="c1"># OrderedDict with same elements but different order are considered different</span>
<a id="__codelineno-0-35" name="__codelineno-0-35"></a>
<a id="__codelineno-0-36" name="__codelineno-0-36"></a>
<a id="__codelineno-0-37" name="__codelineno-0-37"></a><span class="c1"># USERDICT ()</span>
<a id="__codelineno-0-38" name="__codelineno-0-38"></a><span class="c1"># pure implementation in pythondi a map that works like a normal dictionary.</span>
<a id="__codelineno-0-39" name="__codelineno-0-39"></a><span class="c1"># Designated to create subclasses</span>
<a id="__codelineno-0-40" name="__codelineno-0-40"></a><span class="n">UserDict</span><span class="o">.</span><span class="n">data</span> <span class="c1"># recipient of UserDict content</span>
<a id="__codelineno-0-41" name="__codelineno-0-41"></a>
<a id="__codelineno-0-42" name="__codelineno-0-42"></a>
<a id="__codelineno-0-43" name="__codelineno-0-43"></a><span class="c1"># NAMEDTUPLE ()</span>
<a id="__codelineno-0-44" name="__codelineno-0-44"></a><span class="c1"># each namedtuple is represented by its own class</span>
<a id="__codelineno-0-45" name="__codelineno-0-45"></a><span class="kn">from</span> <span class="nn">collections</span> <span class="kn">import</span> <span class="n">namedtuple</span>
<a id="__codelineno-0-46" name="__codelineno-0-46"></a><span class="n">NomeClasse</span> <span class="o">=</span> <span class="n">namedtuple</span> <span class="p">(</span><span class="n">NomeClasse</span><span class="p">,</span> <span class="n">parameters_separated_from_space</span><span class="p">)</span>
<a id="__codelineno-0-47" name="__codelineno-0-47"></a><span class="n">var</span> <span class="o">=</span> <span class="n">ClassName</span> <span class="p">(</span><span class="n">parameters</span><span class="p">)</span>
<a id="__codelineno-0-48" name="__codelineno-0-48"></a><span class="n">var</span><span class="o">.</span><span class="n">attribute</span> <span class="c1"># access to attributes</span>
<a id="__codelineno-0-49" name="__codelineno-0-49"></a><span class="n">var</span> <span class="p">[</span><span class="n">index</span><span class="p">]</span> <span class="c1"># access to attributes</span>
<a id="__codelineno-0-50" name="__codelineno-0-50"></a><span class="n">var</span><span class="o">.</span><span class="n">_fields</span> <span class="c1"># access to attribute list</span>
<a id="__codelineno-0-51" name="__codelineno-0-51"></a><span class="n">var</span> <span class="o">=</span> <span class="n">class</span><span class="o">.</span><span class="n">_make</span> <span class="p">(</span><span class="n">iterable</span><span class="p">)</span> <span class="c1"># transformain namedtuple</span>
<a id="__codelineno-0-52" name="__codelineno-0-52"></a><span class="n">var</span><span class="o">.</span><span class="n">_asdict</span> <span class="p">()</span> <span class="c1"># Return OrderedDict object starting from namedtuple</span>
<a id="__codelineno-0-53" name="__codelineno-0-53"></a>
<a id="__codelineno-0-54" name="__codelineno-0-54"></a>
<a id="__codelineno-0-55" name="__codelineno-0-55"></a><span class="c1"># DEQUE ()</span>
<a id="__codelineno-0-56" name="__codelineno-0-56"></a><span class="c1"># double ended queue (pronounced &quot;deck&quot;)</span>
<a id="__codelineno-0-57" name="__codelineno-0-57"></a><span class="c1"># list editable on both &quot;sides&quot;</span>
<a id="__codelineno-0-58" name="__codelineno-0-58"></a><span class="kn">from</span> <span class="nn">collections</span> <span class="kn">import</span> <span class="n">deque</span>
<a id="__codelineno-0-59" name="__codelineno-0-59"></a><span class="n">var</span> <span class="o">=</span> <span class="n">deque</span> <span class="p">(</span><span class="n">iterable</span><span class="p">,</span> <span class="n">maxlen</span> <span class="o">=</span> <span class="n">num</span><span class="p">)</span> <span class="c1"># -&gt; deque object</span>
<a id="__codelineno-0-60" name="__codelineno-0-60"></a><span class="n">var</span><span class="o">.</span><span class="n">append</span> <span class="p">(</span><span class="n">item</span><span class="p">)</span> <span class="c1"># add item to the bottom</span>
<a id="__codelineno-0-61" name="__codelineno-0-61"></a><span class="n">var</span><span class="o">.</span><span class="n">appendleft</span> <span class="p">(</span><span class="n">item</span><span class="p">)</span> <span class="c1"># add item to the beginning</span>
<a id="__codelineno-0-62" name="__codelineno-0-62"></a><span class="n">var</span><span class="o">.</span><span class="n">clear</span> <span class="p">()</span> <span class="c1"># remove all elements</span>
<a id="__codelineno-0-63" name="__codelineno-0-63"></a><span class="n">var</span><span class="o">.</span><span class="n">extend</span> <span class="p">(</span><span class="n">iterable</span><span class="p">)</span> <span class="c1"># add iterable to the bottom</span>
<a id="__codelineno-0-64" name="__codelineno-0-64"></a><span class="n">var</span><span class="o">.</span><span class="n">extendleft</span> <span class="p">(</span><span class="n">iterable</span><span class="p">)</span> <span class="c1"># add iterable to the beginning &#39;</span>
<a id="__codelineno-0-65" name="__codelineno-0-65"></a><span class="n">var</span><span class="o">.</span><span class="n">insert</span> <span class="p">(</span><span class="n">index</span><span class="p">,</span> <span class="n">item</span><span class="p">)</span> <span class="c1"># insert index position</span>
<a id="__codelineno-0-66" name="__codelineno-0-66"></a><span class="n">var</span><span class="o">.</span><span class="n">index</span> <span class="p">(</span><span class="n">item</span><span class="p">,</span> <span class="n">start</span><span class="p">,</span> <span class="n">stop</span><span class="p">)</span> <span class="c1"># returns position of item</span>
<a id="__codelineno-0-67" name="__codelineno-0-67"></a><span class="n">var</span><span class="o">.</span><span class="n">count</span> <span class="p">(</span><span class="n">item</span><span class="p">)</span>
<a id="__codelineno-0-68" name="__codelineno-0-68"></a><span class="n">var</span><span class="o">.</span><span class="n">pop</span> <span class="p">()</span>
<a id="__codelineno-0-69" name="__codelineno-0-69"></a><span class="n">var</span><span class="o">.</span><span class="n">popleft</span> <span class="p">()</span>
<a id="__codelineno-0-70" name="__codelineno-0-70"></a><span class="n">var</span><span class="o">.</span><span class="n">remove</span> <span class="p">(</span><span class="n">value</span><span class="p">)</span>
<a id="__codelineno-0-71" name="__codelineno-0-71"></a><span class="n">var</span><span class="o">.</span><span class="n">reverse</span> <span class="p">()</span> <span class="c1"># reverse element order</span>
<a id="__codelineno-0-72" name="__codelineno-0-72"></a><span class="n">var</span><span class="o">.</span><span class="n">rotate</span> <span class="p">(</span><span class="n">n</span><span class="p">)</span> <span class="c1"># move the elements of n steps (dx if n&gt; 0, sx if n &lt;0)</span>
<a id="__codelineno-0-73" name="__codelineno-0-73"></a><span class="n">var</span><span class="o">.</span><span class="n">sort</span> <span class="p">()</span>
</code></pre></div></td></tr></table></div>
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