{"id":2826,"date":"2023-07-20T12:48:52","date_gmt":"2023-07-20T12:48:52","guid":{"rendered":"https:\/\/statorials.org\/pt\/declaracao-de-caso-pandas\/"},"modified":"2023-07-20T12:48:52","modified_gmt":"2023-07-20T12:48:52","slug":"declaracao-de-caso-pandas","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/declaracao-de-caso-pandas\/","title":{"rendered":"Como escrever uma declara\u00e7\u00e3o de caso em pandas (com exemplo)"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Uma <strong>instru\u00e7\u00e3o case<\/strong> \u00e9 um tipo de instru\u00e7\u00e3o que percorre as condi\u00e7\u00f5es e retorna um valor quando a primeira condi\u00e7\u00e3o \u00e9 atendida.<\/span><\/p>\n<p> <span style=\"color: #000000;\">A maneira mais simples de implementar uma instru\u00e7\u00e3o case em um DataFrame do Pandas \u00e9 usar a fun\u00e7\u00e3o <strong>NumPywhere()<\/strong> , que usa a seguinte sintaxe b\u00e1sica:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>df[' <span style=\"color: #ff0000;\">new_column<\/span> '] = np. <span style=\"color: #3366ff;\">where<\/span> (df[' <span style=\"color: #ff0000;\">col2<\/span> ']&lt;9, 'value1',\n                   n.p. <span style=\"color: #3366ff;\">where<\/span> (df[' <span style=\"color: #ff0000;\">col2<\/span> ']&lt;12, 'value2',\n                   n.p. <span style=\"color: #3366ff;\">where<\/span> (df[' <span style=\"color: #ff0000;\">col2<\/span> ']&lt;15, 'value3', 'value4')))\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Esta fun\u00e7\u00e3o espec\u00edfica analisa o valor na coluna chamada <strong>col2<\/strong> e retorna:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">\u201c <strong>valor1<\/strong> \u201d se o valor em col2 for menor que 9<\/span><\/li>\n<li> <span style=\"color: #000000;\">\u201c <strong>valor2<\/strong> \u201d se o valor em col2 for menor que 12<\/span><\/li>\n<li> <span style=\"color: #000000;\">\u201c <strong>valor3<\/strong> \u201d se o valor em col2 for menor que 15<\/span><\/li>\n<li> <span style=\"color: #000000;\">\u201c <strong>valor4<\/strong> \u201d se nenhuma das condi\u00e7\u00f5es anteriores for verdadeira<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">O exemplo a seguir mostra como usar esta fun\u00e7\u00e3o na pr\u00e1tica.<\/span><\/p>\n<h3> <strong><span style=\"color: #000000;\">Exemplo: declara\u00e7\u00e3o de caso em Pandas<\/span><\/strong><\/h3>\n<p> <span style=\"color: #000000;\">Suponha que temos o seguinte DataFrame do pandas:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">import<\/span> pandas <span style=\"color: #008000;\">as<\/span> pd\n<span style=\"color: #008000;\">import<\/span> numpy <span style=\"color: #008000;\">as<\/span> np\n\n<span style=\"color: #008080;\">#createDataFrame\n<\/span>df = pd. <span style=\"color: #3366ff;\">DataFrame<\/span> ({' <span style=\"color: #ff0000;\">player<\/span> ': [1, 2, 3, 4, 5, 6, 7, 8, 9, 10],\n                   ' <span style=\"color: #ff0000;\">points<\/span> ': [6, 8, 9, 9, 12, 14, 15, 17, 19, 22]})\n\n<span style=\"color: #008080;\">#view DataFrame\n<\/span>df\n\n\tplayer points\n0 1 6\n1 2 8\n2 3 9\n3 4 9\n4 5 12\n5 6 14\n6 7 15\n7 8 17\n8 9 19\n9 10 22\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><span style=\"color: #000000;\">Podemos usar a seguinte sintaxe para escrever uma instru\u00e7\u00e3o case que cria uma nova coluna chamada <strong>classe<\/strong> cujos valores s\u00e3o determinados pelos valores na coluna <strong>de pontos<\/strong> :<\/span><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#add 'class' column using case-statement logic\n<\/span>df[' <span style=\"color: #ff0000;\">class<\/span> '] = np. <span style=\"color: #3366ff;\">where<\/span> (df[' <span style=\"color: #ff0000;\">points<\/span> ']&lt;9, 'Bad',\n              n.p. <span style=\"color: #3366ff;\">where<\/span> (df[' <span style=\"color: #ff0000;\">points<\/span> ']&lt;12, 'OK',\n              n.p. <span style=\"color: #3366ff;\">where<\/span> (df[' <span style=\"color: #ff0000;\">points<\/span> ']&lt;15, 'Good', 'Great')))\n\n<span style=\"color: #008080;\">#view updated DataFrame\n<\/span>df\n\n\tplayer points class\n0 1 6 Bad\n1 2 8 Bad\n2 3 9 OK\n3 4 9 OK\n4 5 12 Good\n5 6 14 Good\n6 7 15 Great\n7 8 17 Great\n8 9 19 Great\n9 10 22 Great\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">A instru\u00e7\u00e3o case analisou o valor na coluna de <strong>pontos<\/strong> e retornou:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">\u201c <strong>Ruim<\/strong> \u201d se o valor na coluna de pontos for menor que 9<\/span><\/li>\n<li> <span style=\"color: #000000;\">\u201c <strong>OK<\/strong> \u201d se o valor na coluna de pontos for menor que 12<\/span><\/li>\n<li> <span style=\"color: #000000;\">\u201c <strong>Bom<\/strong> \u201d se o valor na coluna de pontos for inferior a 15<\/span><\/li>\n<li> <span style=\"color: #000000;\">\u201c <strong>\u00d3timo<\/strong> \u201d se nenhuma das condi\u00e7\u00f5es anteriores for verdadeira<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\"><strong>Nota<\/strong> : Voc\u00ea pode encontrar a documenta\u00e7\u00e3o completa da fun\u00e7\u00e3o <strong>NumPywhere()<\/strong> <a href=\"https:\/\/numpy.org\/doc\/stable\/reference\/generated\/numpy.where.html\" target=\"_blank\" rel=\"noopener\">aqui<\/a> .<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Recursos adicionais<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Os tutoriais a seguir explicam como realizar outras tarefas comuns no Pandas:<\/span><\/p>\n<p><a href=\"https:\/\/statorials.org\/pt\/crie-pandas-com-base-em-colunas\/\" target=\"_blank\" rel=\"noopener\">Como criar uma nova coluna baseada em uma condi\u00e7\u00e3o no Pandas<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/numpy-ou-multiplas-condicoes\/\" target=\"_blank\" rel=\"noopener\">Como usar a fun\u00e7\u00e3o NumPy Where() com m\u00faltiplas condi\u00e7\u00f5es<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Uma instru\u00e7\u00e3o case \u00e9 um tipo de instru\u00e7\u00e3o que percorre as condi\u00e7\u00f5es e retorna um valor quando a primeira condi\u00e7\u00e3o \u00e9 atendida. A maneira mais simples de implementar uma instru\u00e7\u00e3o case em um DataFrame do Pandas \u00e9 usar a fun\u00e7\u00e3o NumPywhere() , que usa a seguinte sintaxe b\u00e1sica: df[&#8216; new_column &#8216;] = np. where (df[&#8216; [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-2826","post","type-post","status-publish","format-standard","hentry","category-guia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Como escrever uma declara\u00e7\u00e3o de caso no Pandas (com exemplo) - Estatologia<\/title>\n<meta name=\"description\" content=\"Este tutorial explica como escrever uma instru\u00e7\u00e3o case em pandas, incluindo um exemplo completo.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/statorials.org\/pt\/declaracao-de-caso-pandas\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como escrever uma declara\u00e7\u00e3o de caso no Pandas (com exemplo) - Estatologia\" \/>\n<meta property=\"og:description\" content=\"Este tutorial explica como escrever uma instru\u00e7\u00e3o case em pandas, incluindo um exemplo completo.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/declaracao-de-caso-pandas\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-20T12:48:52+00:00\" \/>\n<meta name=\"author\" content=\"Dr. benjamim anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Dr. benjamim anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo estimado de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pt\/declaracao-de-caso-pandas\/\",\"url\":\"https:\/\/statorials.org\/pt\/declaracao-de-caso-pandas\/\",\"name\":\"Como escrever uma declara\u00e7\u00e3o de caso no Pandas (com exemplo) - Estatologia\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-20T12:48:52+00:00\",\"dateModified\":\"2023-07-20T12:48:52+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Este tutorial explica como escrever uma instru\u00e7\u00e3o case em pandas, incluindo um exemplo completo.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/declaracao-de-caso-pandas\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/declaracao-de-caso-pandas\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/declaracao-de-caso-pandas\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Como escrever uma declara\u00e7\u00e3o de caso em pandas (com exemplo)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/pt\/#website\",\"url\":\"https:\/\/statorials.org\/pt\/\",\"name\":\"Statorials\",\"description\":\"O seu guia para a literacia estat\u00edstica!\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/pt\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"pt-PT\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\",\"name\":\"Dr. benjamim anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"pt-PT\",\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/statorials.org\/pt\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"https:\/\/statorials.org\/pt\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Dr. benjamim anderson\"},\"description\":\"Ol\u00e1, sou Benjamin, um professor aposentado de estat\u00edstica que se tornou professor dedicado na Statorials. 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