{"id":1489,"date":"2019-09-06T16:21:39","date_gmt":"2019-09-06T14:21:39","guid":{"rendered":"https:\/\/www.mathweb.fr\/euclide\/?p=1489"},"modified":"2024-06-09T17:05:01","modified_gmt":"2024-06-09T15:05:01","slug":"les-classes-en-python","status":"publish","type":"post","link":"https:\/\/www.mathweb.fr\/euclide\/2019\/09\/06\/les-classes-en-python\/","title":{"rendered":"Les classes en Python"},"content":{"rendered":"\n<p>Dans le programme de Terminale NSI, la notion de <em>classes<\/em> Python appara\u00eet. En 1\u00e8re, on ne doit pas en parler car la Premi\u00e8re est une classe d&#8217;initiation. Comment se pr\u00e9sente une classe ? Et en quoi peut-elle aider ? Voici quelques \u00e9l\u00e9ments de r\u00e9ponse.<\/p>\n\n\n\n<!--more-->\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2020\/09\/Python-classes-1024x640.png\" alt=\"python classes\" class=\"wp-image-3340\" srcset=\"https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2020\/09\/Python-classes-1024x640.png 1024w, https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2020\/09\/Python-classes-300x188.png 300w, https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2020\/09\/Python-classes-600x375.png 600w, https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2020\/09\/Python-classes-768x480.png 768w, https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2020\/09\/Python-classes.png 1080w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 counter-hierarchy ez-toc-counter ez-toc-white ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Au menu sur cette page...<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.mathweb.fr\/euclide\/2019\/09\/06\/les-classes-en-python\/#Cest_quoi_une_classe\" >C&#8217;est quoi une classe ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.mathweb.fr\/euclide\/2019\/09\/06\/les-classes-en-python\/#Et_ca_donne_quoi_les_classes_en_Python\" >Et \u00e7a donne quoi les classes en Python ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.mathweb.fr\/euclide\/2019\/09\/06\/les-classes-en-python\/#Un_autre_exemple_pour_la_route\" >Un autre exemple (pour la route)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.mathweb.fr\/euclide\/2019\/09\/06\/les-classes-en-python\/#Pour_aller_plus_loin%E2%80%A6\" >Pour aller plus loin&#8230;<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cest_quoi_une_classe\"><\/span>C&#8217;est quoi une classe ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>On va dire, pour simplifier, que c&#8217;est un objet qui regroupe plusieurs &#8220;fonctions&#8221;. Par exemple, la classe <em>marteau<\/em> pourra avoir comme fonction <em>enfoncer<\/em>, fonction qui aura comme argument par exemple un <em>clou<\/em>.<\/p>\n\n\n\n<p>Les fonctions des classes sont appel\u00e9es des <em>m\u00e9thodes<\/em>. Quant aux arguments des m\u00e9thodes, on les appelle des <em>attributs<\/em>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Et_ca_donne_quoi_les_classes_en_Python\"><\/span>Et \u00e7a donne quoi les classes en Python ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>L&#8217;impl\u00e9mentation d&#8217;une classe peut se faire de diverses fa\u00e7ons. Je vais en montrer une seule, que je trouve plus pratique et plus simple. Pour ce paragraphe, je ne vais plus prendre l&#8217;exemple du marteau, mais un exemple plus parlant. Je vais cr\u00e9\u00e9 une classe <em>mot<\/em> avec une m\u00e9thode <em>anagramme<\/em> qui aura pour mission de recracher une anagramme du mot.<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"dracula\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">from random import shuffle\n\nclass Mot:\n    def __init__(self,mot):\n        self.mot = mot\n\n    def anagramme(self):\n        a = list(self.mot)\n        shuffle(a)\n        return \"\".join( a )\n\nm = Mot(\"palindrome\")\nprint( m.anagramme() )<\/pre>\n\n\n\n<p>On commence alors par d\u00e9finir une variable &#8220;m&#8221; comme \u00e9tant un Mot. <em>m<\/em>  est un objet d\u00e9fini par notre classe. Cet objet est construit \u00e0 partir d&#8217;une cha\u00eene de caract\u00e8res (ici, &#8220;palindrome&#8221;). Alors, &#8220;<em>m.anagramme()<\/em>&#8221; va d\u00e9signer l&#8217;action faite sur le mot &#8220;m&#8221; en utilisant la m\u00e9thode <em>anagramme<\/em>; le r\u00e9sultat sera une cha\u00eene de caract\u00e8res correspondant \u00e0 une anagramme de l&#8217;objet &#8220;m&#8221;.<\/p>\n\n\n\n<p>On peut imaginer alors plusieurs m\u00e9thodes pour un m\u00eame <em>objet<\/em>. Les classes font d&#8217;ailleurs partie de ce que l&#8217;on appel la <em>Programmation Orient\u00e9e Objet<\/em> (POO).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Un_autre_exemple_pour_la_route\"><\/span>Un autre exemple (pour la route)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"dracula\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class Rectangle:\n    def __init__(self,a,b):\n        self.longueur, self.largeur = a , b\n\n    def perimetre(self):\n        return 2 * (self.longueur + self.largeur)\n\n    def aire(self):\n        return self.longueur * self.largeur\n\n    def is_square(self):\n        return self.longueur == self.largeur\n\nfig = Rectangle(3,8)\n\nprint( \"Le p\u00e9rim\u00e9tre est :\" , fig.perimetre() )\nprint( \"L'aire est :\" , fig.aire() )\nif fig.is_square():\n    print( \"C'est un carr\u00e9\" )\nelse:\n    print(\"Ce n'est pas un carr\u00e9\")<\/pre>\n\n\n\n<p>Ici, on d\u00e9finit l&#8217;objet &#8220;Rectangle&#8221; avec trois m\u00e9thodes :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><em>perimetre<\/em>, qui donne le p\u00e9rim\u00e8tre du rectangle<\/li>\n\n\n\n<li><em>aire<\/em>, qui donne son aire<\/li>\n\n\n\n<li><em>is_square<\/em>, qui dit si c&#8217;est un carr\u00e9.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Pour_aller_plus_loin%E2%80%A6\"><\/span>Pour aller plus loin&#8230;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>L\u00e0 o\u00f9 \u00e7a commence \u00e0 \u00eatre int\u00e9ressant, c&#8217;est quand on souhaite impl\u00e9menter des objets plus abstraits. Par exemple, des arbres ou des graphes.<\/p>\n\n\n\n<p>J&#8217;ai cr\u00e9\u00e9 une classe qui g\u00e8re :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>la construction de graphes non pond\u00e9r\u00e9s, <\/li>\n\n\n\n<li>leurs parcours (en largeur et en profondeur),  <\/li>\n\n\n\n<li>d&#8217;autres op\u00e9rations, comme l&#8217;affichage de tous les chemins d&#8217;un sommet \u00e0 un autre)<\/li>\n<\/ul>\n\n\n\n<p>ainsi qu&#8217;une autre classe permettant d&#8217;obtenir le plus court chemin pour un graphe pond\u00e9r\u00e9 \u00e0 l&#8217;aide de l&#8217;algorithme de Dijkstra.<\/p>\n\n\n\n<p>Vous trouverez dans un fichier .py:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><em>Graphe<\/em>, une classe avec plusieurs m\u00e9thodes. <em>addArete<\/em> permet d&#8217;ajouter une ar\u00eate entre deux sommets afin d&#8217;impl\u00e9menter le graphe, de le d\u00e9finir). <em>cycles<\/em> permet d&#8217;afficher tous les cycles du graphe). <em>chemins<\/em> permet d&#8217;afficher tous les chemins d&#8217;un sommet \u00e0 un autre. <em>parcoursProfondeur<\/em> et <em>parcoursLargeur <\/em>qui parcourent donc le graphe en profondeur et en largeur;<\/li>\n\n\n\n<li><em>GraphePondM<\/em>, une classe destin\u00e9e aux graphes pond\u00e9r\u00e9s d\u00e9finis par une matrice de valuation, avec plusieurs m\u00e9thodes. <em>add<\/em>  : ajoute une ligne \u00e0 la matrice de valuation. <em>dijkstra<\/em> : retourne le plus court chemin \u00e0 partir d&#8217;un sommet vers tous les autres sommets;<\/li>\n\n\n\n<li><em>GraphePond<\/em>, une classe destin\u00e9e aux graphes pond\u00e9r\u00e9s d\u00e9finis par liste d&#8217;adjacence valu\u00e9e.  Par exemple, <em>add(&#8216;A&#8217;,&#8217;B&#8217;,4)<\/em> signifie qu&#8217;il y a un arc orient\u00e9 de A vers B avec un poids de 4. Cette classe admet les m\u00eames m\u00e9thodes que <em>GraphePondM<\/em>.<\/li>\n<\/ul>\n\n\n\n<p>Ce fichier est t\u00e9l\u00e9chargeable ci-dessous:<\/p>\n\n\n\n<div class=\"wp-block-file aligncenter um_article\"><a href=\"https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2019\/09\/Graphes.zip\">Graphes<\/a><a href=\"https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2019\/09\/Graphes.zip\" class=\"wp-block-file__button wp-element-button\" download>T\u00e9l\u00e9charger<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Dans le programme de Terminale NSI, la notion de classes Python appara\u00eet. En 1\u00e8re, on ne doit pas en parler car la Premi\u00e8re est une classe d&#8217;initiation. Comment se pr\u00e9sente une classe ? Et en quoi peut-elle aider ? Voici quelques \u00e9l\u00e9ments de r\u00e9ponse.<\/p>\n","protected":false},"author":1,"featured_media":3733,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,5],"tags":[132,140],"class_list":["post-1489","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-informatique","category-python","tag-classe","tag-poo"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Les classes en Python - Mathweb.fr - Exemples de programmes<\/title>\n<meta name=\"description\" content=\"La notion de Classes en Python est abord\u00e9e en classe de Terminale NSI. 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