{"id":2572,"date":"2020-06-13T06:31:30","date_gmt":"2020-06-13T04:31:30","guid":{"rendered":"https:\/\/www.mathweb.fr\/euclide\/?p=2572"},"modified":"2020-10-05T15:01:25","modified_gmt":"2020-10-05T13:01:25","slug":"extraire-le-code-latex-entre-deux-balises-avec-python","status":"publish","type":"post","link":"https:\/\/www.mathweb.fr\/euclide\/2020\/06\/13\/extraire-le-code-latex-entre-deux-balises-avec-python\/","title":{"rendered":"Extraire le code \\(\\LaTeX\\) entre deux balises avec Python"},"content":{"rendered":"\n<p>5h12 du matin: je n&#8217;arrive pas \u00e0 me rendormir&#8230; Je viens d&#8217;avoir une id\u00e9e en t\u00eate et comme je ne suis pas procrastinateur, je me l\u00e8ve pour la concr\u00e9tiser. L&#8217;id\u00e9e du jour (enfin&#8230; de la nuit): comment extraire automatiquement la portion de code \\(\\LaTeX\\) contenue entre deux balises <strong>\\begin{python}<\/strong> et <strong>\\end{python}<\/strong>, et enregistrer cette portion de code dans un fichier, le tout avec Python ?<\/p>\n\n\n\n<!--more-->\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"400\" src=\"https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2020\/06\/extraire-code-entre-balises-python.png\" alt=\"Extraire du code entre deux balises avec Python\" class=\"wp-image-2573\" srcset=\"https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2020\/06\/extraire-code-entre-balises-python.png 700w, https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2020\/06\/extraire-code-entre-balises-python-600x343.png 600w, https:\/\/www.mathweb.fr\/euclide\/wp-content\/uploads\/2020\/06\/extraire-code-entre-balises-python-300x171.png 300w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><figcaption>Extraire du code entre deux balises avec Python<\/figcaption><\/figure><\/div>\n\n\n\n<p>\u00c0 vrai dire, ce n&#8217;est pas tr\u00e8s compliqu\u00e9, et c&#8217;est valable pour n&#8217;importe quelle extension de fichier (ce n&#8217;est pas n\u00e9cessairement un .tex) et n&#8217;importe quelle balise (cela peut \u00eatre du HTML et extraire un code entre les balises <strong>&lt;div&gt;<\/strong> et <strong>&lt;\/div&gt;<\/strong> avec Python). Mais je vais prendre le cas que j&#8217;ai en t\u00eate.<\/p>\n\n\n\n<p>J&#8217;\u00e9cris actuellement des livres dans lesquels j&#8217;ai mis pas mal de code Python entre deux balises <strong>\\begin{python}<\/strong> et <strong>\\end{python}<\/strong>, et pour chacun d&#8217;eux, je les ai test\u00e9 bien \u00e9videmment en les interpr\u00e9tant avec un IDE, mais je ne les ai pas enregistr\u00e9s s\u00e9par\u00e9ment dans des fichiers <em>.py<\/em>.<\/p>\n\n\n\n<p>Avec du recul, j&#8217;aimerais quand-m\u00eame cr\u00e9er ces fichiers afin de les proposer aux acheteurs des livres.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 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\/2020\/06\/13\/extraire-le-code-latex-entre-deux-balises-avec-python\/#Parcourir_le_repertoire\" >Parcourir le r\u00e9pertoire<\/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\/2020\/06\/13\/extraire-le-code-latex-entre-deux-balises-avec-python\/#Parcourir_les_fichiers\" >Parcourir les fichiers<\/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\/2020\/06\/13\/extraire-le-code-latex-entre-deux-balises-avec-python\/#Enregistrer_les_fichiers_Python\" >Enregistrer les fichiers Python<\/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\/2020\/06\/13\/extraire-le-code-latex-entre-deux-balises-avec-python\/#Et_au_final%E2%80%A6_extraire_du_code_entre_deux_balises_avec_Python\" >Et au final&#8230; extraire du code entre deux balises avec Python<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Parcourir_le_repertoire\"><\/span>Parcourir le r\u00e9pertoire<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Imaginons que mes fichiers \\(\\LaTeX\\) soient dans le r\u00e9pertoire courant de mon fichier Python. <\/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=\"\">from os import listdir\nfics = listdir('.')<\/pre>\n\n\n\n<p>cr\u00e9e une liste contenant tous les fichiers du r\u00e9pertoire courant. Je vais donc parcourir cette liste et ne choisir que les fichiers qui se terminent par &#8220;.tex&#8221; avec la m\u00e9thode <a rel=\"noreferrer noopener\" href=\"https:\/\/www.w3schools.com\/python\/ref_string_endswith.asp\" target=\"_blank\">endswith<\/a>(&#8216;.tex&#8217;).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Parcourir_les_fichiers\"><\/span>Parcourir les fichiers<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Pour ce qui est de la manipulation de fichiers, vous pouvez consulter <a href=\"https:\/\/www.mathweb.fr\/euclide\/manipulation-de-fichiers-en-python\/\" target=\"_blank\" rel=\"noreferrer noopener\">cette page<\/a>.<\/p>\n\n\n\n<p>Je vais donc parcourir ligne par ligne tous les fichiers rencontr\u00e9s avec la logique suivante:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>si je rencontre &#8220;\\begin{python}&#8221; alors je commence \u00e0 enregistrer le contenu du fichier;<\/li><li>si je rencontre &#8220;\\end{python}&#8221; alors j&#8217;arr\u00eate l&#8217;enregistrement et je mets tout dans un fichier Python.<\/li><\/ul>\n\n\n\n<p>Je vais me servir d&#8217;un bool\u00e9en pour savoir si je dois enregistrer la ligne rencontr\u00e9e, et d&#8217;une cha\u00eene de caract\u00e8re nomm\u00e9e <em>container<\/em> pour stocker les lignes \u00e0 retenir. Je vais aussi cr\u00e9er un compteur pour nommer les fichiers Python. Et cela donne :<\/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=\"\">counter = 0\nfor file in listdir('.'):\n    if file.endswith('.tex'):\n        container = ''\n        start = False\n        with open(file, 'r' , encoding = 'utf8') as Fichier:\n            for ligne in Fichier:\n                if '\\\\end{python}' in ligne:\n                    start = False\n                    counter += 1\n                    record_file(counter,container)\n                    container = ''\n                elif start == True:\n                    container += ligne\n                elif '\\\\begin{python}' in ligne:\n                    start = True<\/pre>\n\n\n\n<p>Il ne me reste plus qu&#8217;\u00e0 d\u00e9finir ma fonction <em>record_file<\/em>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Enregistrer_les_fichiers_Python\"><\/span>Enregistrer les fichiers Python<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=\"\">def record_file(c , text):\n    makedirs('Python', exist_ok = True)\n    name = 'Python\/' + str(c) + '.py'\n    file_python = open(name, 'w' , encoding='utf8')\n    file_python.write( text )\n    file_python.close()<\/pre>\n\n\n\n<p>Ici, rien de bien m\u00e9chant: je commence par cr\u00e9er un r\u00e9pertoire &#8220;Python&#8221; dans lequel je souhaite enregistrer tous mes fichiers Python. Notez la pr\u00e9sence du param\u00e8tre &#8220;exist_ok = True&#8221; dans la fonction <em>makedirs<\/em> du module <em>os<\/em>, qui signifie que si le r\u00e9pertoire existe d\u00e9j\u00e0, aucune erreur ne doit \u00eatre retourn\u00e9e.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Et_au_final%E2%80%A6_extraire_du_code_entre_deux_balises_avec_Python\"><\/span>Et au final&#8230; extraire du code entre deux balises avec Python<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=\"\">from os import listdir, makedirs\n\ndef record_file(c , text):\n    makedirs('Python', exist_ok = True)\n    name = 'Python\/' + str(c) + '.py'\n    file_python = open(name , 'w' , encoding = 'utf8')\n    file_python.write( text )\n    file_python.close()\n\ncounter = 0\nfor file in listdir('.'):\n    if file.endswith('.tex'):\n        container = ''\n        start = False\n        with open(file, 'r' , encoding = 'utf8') as Fichier:\n            for ligne in Fichier:\n                if '\\\\end{python}' in ligne:\n                    start = False\n                    counter += 1\n                    record_file(counter,container)\n                    container = ''\n                elif start == True:\n                    container += ligne\n                elif '\\\\begin{python}' in ligne:\n                    start = True<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>5h12 du matin: je n&#8217;arrive pas \u00e0 me rendormir&#8230; Je viens d&#8217;avoir une id\u00e9e en t\u00eate et comme je ne suis pas procrastinateur, je me l\u00e8ve pour la concr\u00e9tiser. L&#8217;id\u00e9e du jour (enfin&#8230; de la nuit): comment extraire automatiquement la portion de code \\(\\LaTeX\\) contenue entre deux balises \\begin{python} et [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2573,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,1,5],"tags":[213,211,212],"class_list":["post-2572","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-informatique","category-latex","category-python","tag-extraction","tag-fichiers","tag-manipulation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Extraire le code \\(\\LaTeX\\) entre deux balises avec Python - Mathweb.fr<\/title>\n<meta name=\"description\" content=\"Pour extraire du code qui est entre deux balises, quel que soit le type de fichier, Python peut s&#039;av\u00e9rer tr\u00e8s utile... 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