{"id":7398,"date":"2022-03-15T16:22:18","date_gmt":"2022-03-15T15:22:18","guid":{"rendered":"https:\/\/www.mathweb.fr\/euclide\/?p=7398"},"modified":"2022-03-21T13:30:22","modified_gmt":"2022-03-21T12:30:22","slug":"ajout-dans-une-liste-en-python-difference-entre-operateur-plus-et-append","status":"publish","type":"post","link":"https:\/\/www.mathweb.fr\/euclide\/2022\/03\/15\/ajout-dans-une-liste-en-python-difference-entre-operateur-plus-et-append\/","title":{"rendered":"Ajout dans une liste en Python: diff\u00e9rence entre + et append"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Quand on souhaite ajouter un \u00e9l\u00e9ment \u00e0 une liste en Python, il y a une diff\u00e9rence entre la m\u00e9thode <em>append<\/em> et la syntaxe avec le signe &#8220;+&#8221;.<\/p>\n\n\n\n<!--more-->\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 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 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href=\"https:\/\/www.mathweb.fr\/euclide\/2022\/03\/15\/ajout-dans-une-liste-en-python-difference-entre-operateur-plus-et-append\/#Difference_entre_loperateur_et_append_lors_de_lajout_dans_une_liste_en_Python_loperateur_%E2%80%9C%E2%80%9D\" >Diff\u00e9rence entre l&#8217;op\u00e9rateur + et append lors de l&#8217;ajout dans une liste en Python: l&#8217;op\u00e9rateur &#8220;+&#8221;<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.mathweb.fr\/euclide\/2022\/03\/15\/ajout-dans-une-liste-en-python-difference-entre-operateur-plus-et-append\/#Ce_que_fait_loperateur_%E2%80%9C%E2%80%9D\" >Ce que fait l&#8217;op\u00e9rateur &#8220;+&#8221;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.mathweb.fr\/euclide\/2022\/03\/15\/ajout-dans-une-liste-en-python-difference-entre-operateur-plus-et-append\/#Complexite\" >Complexit\u00e9<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.mathweb.fr\/euclide\/2022\/03\/15\/ajout-dans-une-liste-en-python-difference-entre-operateur-plus-et-append\/#Difference_entre_loperateur_et_append_lors_de_lajout_dans_une_liste_en_Python_la_methode_append\" >Diff\u00e9rence entre l&#8217;op\u00e9rateur + et append lors de l&#8217;ajout dans une liste en Python: la m\u00e9thode append<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.mathweb.fr\/euclide\/2022\/03\/15\/ajout-dans-une-liste-en-python-difference-entre-operateur-plus-et-append\/#Ce_que_fait_la_methode_append\" >Ce que fait la m\u00e9thode append<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.mathweb.fr\/euclide\/2022\/03\/15\/ajout-dans-une-liste-en-python-difference-entre-operateur-plus-et-append\/#Complexite_de_la_methode_append\" >Complexit\u00e9 de la m\u00e9thode append<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.mathweb.fr\/euclide\/2022\/03\/15\/ajout-dans-une-liste-en-python-difference-entre-operateur-plus-et-append\/#Conclusion_que_doit-on_privilegier\" >Conclusion: que doit-on privil\u00e9gier ?<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Difference_entre_loperateur_et_append_lors_de_lajout_dans_une_liste_en_Python_preliminaires\"><\/span>Diff\u00e9rence entre l&#8217;op\u00e9rateur + et append lors de l&#8217;ajout dans une liste en Python: pr\u00e9liminaires<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u00c9tant donn\u00e9e une liste L, on sait que l&#8217;on peut ajouter un \u00e9l\u00e9ment en Python en utilisant l&#8217;une des deux solutions suivantes:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"dracula\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"false\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">L = []\nL.append('e')<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">ou<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"dracula\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"false\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">L = []\nL += ['e']<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Y a-t-il une diff\u00e9rence entre ces deux possibilit\u00e9s ?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour le savoir, il faut d\u00e9cortiquer ce qu&#8217;elles font.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Difference_entre_loperateur_et_append_lors_de_lajout_dans_une_liste_en_Python_loperateur_%E2%80%9C%E2%80%9D\"><\/span>Diff\u00e9rence entre l&#8217;op\u00e9rateur + et append lors de l&#8217;ajout dans une liste en Python: l&#8217;op\u00e9rateur &#8220;+&#8221;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ce_que_fait_loperateur_%E2%80%9C%E2%80%9D\"><\/span>Ce que fait l&#8217;op\u00e9rateur &#8220;+&#8221;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">L&#8217;appel de l&#8217;op\u00e9rateur &#8220;+&#8221; oblige Python \u00e0 cr\u00e9er une nouvelle liste en laissant de l&#8217;espace (\u00e0 la fin de cette nouvelle liste) pour l&#8217;\u00e9l\u00e9ment \u00e0 ins\u00e9rer. Ensuite, la premi\u00e8re liste est copi\u00e9e dans celle fra\u00eechement cr\u00e9\u00e9e et enfin, l&#8217;\u00e9l\u00e9ment est mis en dernier.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour r\u00e9sumer, quand on fait appel \u00e0 l&#8217;op\u00e9rateur &#8220;+&#8221;:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>la liste initiale n&#8217;est pas modifi\u00e9e;<\/li><li>une nouvelle liste (temporaire) est cr\u00e9\u00e9e avec un espace en plus;<\/li><li>la liste initiale est copi\u00e9e dans la liste temporaire;<\/li><li>le nouvel \u00e9l\u00e9ment est ins\u00e9r\u00e9 en fin de la liste temporaire;<\/li><li>le pointeur Python (le nom de la liste initiale) est redirig\u00e9 vers la liste temporaire, qui n&#8217;est du coup plus temporaire, mettant ainsi \u00e0 jour l&#8217;objet PythonList.<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Complexite\"><\/span>Complexit\u00e9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">L&#8217;ajout de <em>n<\/em> \u00e9l\u00e9ments via l&#8217;op\u00e9rateur &#8220;+&#8221; admet une complexit\u00e9 en temps en <em>O<\/em>(<em>n<\/em>\u00b2).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En effet, s&#8217;il faut ajouter <em>n<\/em> \u00e9l\u00e9ments, l&#8217;op\u00e9ration pr\u00e9c\u00e9demment expliqu\u00e9e va s&#8217;effectuer 1+2+&#8230;+<em>n<\/em> fois:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>1 fois pour le premier \u00e9l\u00e9ment<\/li><li>2 fois pour le deuxi\u00e8me<\/li><li>&#8230;<\/li><li><em>n<\/em> fois pour le <em>n<\/em>-i\u00e8me<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Or, \\(1+2+\\cdots+n=\\frac{n(n+1)}{2}\\), d&#8217;o\u00f9 une complexit\u00e9 de l&#8217;ordre de <em>n<\/em>\u00b2.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Difference_entre_loperateur_et_append_lors_de_lajout_dans_une_liste_en_Python_la_methode_append\"><\/span>Diff\u00e9rence entre l&#8217;op\u00e9rateur + et append lors de l&#8217;ajout dans une liste en Python: la m\u00e9thode append<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ce_que_fait_la_methode_append\"><\/span>Ce que fait la m\u00e9thode append<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Contrairement \u00e0 l\u2019op\u00e9rateur &#8220;+&#8221;, la m\u00e9thode <em>append<\/em> ne cr\u00e9e pas de nouvelle liste. Elle cr\u00e9e un espace en plus \u00e0 la suite de l&#8217;espace m\u00e9moire d\u00e9di\u00e9 \u00e0 la liste \u00e0 laquelle on souhaite ajouter un \u00e9l\u00e9ment.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Complexite_de_la_methode_append\"><\/span>Complexit\u00e9 de la m\u00e9thode append<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ajouter un \u00e9l\u00e9ment \u00e0 la suite de ce qui existe d\u00e9j\u00e0 a une complexit\u00e9 de O(1).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion_que_doit-on_privilegier\"><\/span>Conclusion: que doit-on privil\u00e9gier ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Il est \u00e9vident, \u00e0 la vue de la complexit\u00e9 des deux possibilit\u00e9s, que la m\u00e9thode <em>append<\/em> est \u00e0 privil\u00e9gier \u00e0 l&#8217;op\u00e9rateur &#8220;+&#8221;, m\u00eame si elle est plus longue \u00e0 \u00e9crire. Mais ceci est valable pour un <em>n<\/em> assez grand.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Voici un graphique pour vous en convaincre:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/media.geeksforgeeks.org\/wp-content\/uploads\/20200501194401\/Comparison-between-operator-and-append-method1.png\" alt=\"diff\u00e9rence append + python\"\/><figcaption>Comparaison de complexit\u00e9 entre l&#8217;op\u00e9rateur &#8220;+&#8221; et la m\u00e9thode <em>append<\/em> (extrait de <a href=\"https:\/\/www.geeksforgeeks.org\/difference-between-and-append-in-python\/\" target=\"_blank\" rel=\"noreferrer noopener\">cette page\/<\/a>)<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Je dois bien dire que sur les exemples que je donne sur ce site, ma syntaxe tourne tr\u00e8s souvent autour de l&#8217;op\u00e9rateur &#8220;+&#8221; car il est bien plus facile (pour moi) d&#8217;\u00e9crire par exemple : &#8221; L += [&#8216;e&#8217;]&#8221; que &#8220;L.append(&#8216;e&#8217;)&#8221;.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Vous le voyez sur le graphique ci-dessus, si <em>n<\/em> ne d\u00e9passe pas 20 000, ce n&#8217;est pas bien grave&#8230; Donc vous me pardonnerez je l&#8217;esp\u00e8re \ud83d\ude42<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Je pense donc qu&#8217;il est important de s&#8217;adapter selon ce que l&#8217;on fait. Bien \u00e9videmment, quand on travaille avec les <em>Big Datas<\/em>, la m\u00e9thode <em>append<\/em> est \u00e0 privil\u00e9gier. Mais quand on est prof et que l&#8217;on manipule des mini-listes, on peut se permettre l&#8217;op\u00e9rateur &#8220;+&#8221;. Mais chacun fait ce qu&#8217;il veut apr\u00e8s tout&#8230;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Si vous souhaitez en savoir plus sur les liste, vous pouvez regarder du c\u00f4t\u00e9 de <a href=\"https:\/\/www.mathweb.fr\/euclide\/python-et-les-listes\/\" target=\"_blank\" rel=\"noreferrer noopener\">cette page<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Quand on souhaite ajouter un \u00e9l\u00e9ment \u00e0 une liste en Python, il y a une diff\u00e9rence entre la m\u00e9thode append et la syntaxe avec le signe &#8220;+&#8221;.<\/p>\n","protected":false},"author":1,"featured_media":7399,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,5],"tags":[],"class_list":["post-7398","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-informatique","category-python"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ajout dans une liste en Python: diff\u00e9rence entre + et append - Mathweb.fr<\/title>\n<meta name=\"description\" content=\"Quelle est la diff\u00e9rence entre la m\u00e9thode append et l&#039;op\u00e9ration + quand on souhaite effectuer un ajout \u00e0 une liste en Python ? 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