{"id":3274,"date":"2023-07-18T08:36:45","date_gmt":"2023-07-18T08:36:45","guid":{"rendered":"https:\/\/statorials.org\/pt\/pandas-a-vs-loc\/"},"modified":"2023-07-18T08:36:45","modified_gmt":"2023-07-18T08:36:45","slug":"pandas-a-vs-loc","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/pandas-a-vs-loc\/","title":{"rendered":"Pandas vs loc: qual a diferen\u00e7a?"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Quando se trata de selecionar linhas e colunas de um DataFrame do pandas, <b>.loc<\/b> e <strong>.at<\/strong> s\u00e3o duas fun\u00e7\u00f5es comumente usadas.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Aqui est\u00e1 a diferen\u00e7a sutil entre as duas fun\u00e7\u00f5es:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>.loc<\/strong> pode receber v\u00e1rias linhas e colunas como argumentos de entrada<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>.at<\/strong> s\u00f3 pode receber uma \u00fanica linha e coluna como argumentos de entrada<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Os exemplos a seguir mostram como usar cada fun\u00e7\u00e3o na pr\u00e1tica com 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\n<span style=\"color: #008080;\">#createDataFrame\n<\/span>df = pd. <span style=\"color: #3366ff;\">DataFrame<\/span> ({' <span style=\"color: #ff0000;\">team<\/span> ': ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H'],\n                   ' <span style=\"color: #ff0000;\">points<\/span> ': [18, 22, 19, 14, 14, 11, 20, 28],\n                   ' <span style=\"color: #ff0000;\">assists<\/span> ': [5, 7, 7, 9, 12, 9, 9, 4],\n                   ' <span style=\"color: #ff0000;\">rebounds<\/span> ': [11, 8, 10, 6, 6, 5, 9, 12]})\n\n<span style=\"color: #008080;\">#view DataFrame\n<\/span><span style=\"color: #008000;\">print<\/span> (df)\n\n  team points assists rebounds\n0 A 18 5 11\n1 B 22 7 8\n2 C 19 7 10\n3 D 14 9 6\n4 E 14 12 6\n5 F 11 9 5\n6 G 20 9 9\n7:28 4 12\n<\/strong><\/pre>\n<h2> <span style=\"color: #000000;\"><strong>Exemplo 1: Como usar loc no Pandas<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como usar <strong>.loc<\/strong> para acessar o valor no DataFrame localizado na posi\u00e7\u00e3o 0 do \u00edndice da coluna do ponto:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#select value located at index position 0 of the points column\n<span style=\"color: #000000;\">df. <span style=\"color: #3366ff;\">loc<\/span> [0, ' <span style=\"color: #ff0000;\">points<\/span> ']\n\n18<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Isso retorna um valor de <strong>18<\/strong> .<\/span><\/p>\n<p> <span style=\"color: #000000;\"><span style=\"color: #000000;\">E o c\u00f3digo a seguir mostra como usar <strong>.loc<\/strong> para acessar linhas entre os valores de \u00edndice 0 e 4, bem como colunas de pontos e assist\u00eancias:<\/span><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#select rows between index values 0 and 4 and columns 'points' and 'assists'\n<span style=\"color: #000000;\">df. <span style=\"color: #3366ff;\">loc<\/span> [0:4, [' <span style=\"color: #ff0000;\">points<\/span> ', ' <span style=\"color: #ff0000;\">assists<\/span> ']]\n\n        assist points\n0 18 5\n1 22 7\n2 19 7\n3 14 9\n4 14 12<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Quer queiramos acessar um \u00fanico valor ou um grupo de linhas e colunas, a fun\u00e7\u00e3o <strong>.loc<\/strong> pode fazer as duas coisas.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Exemplo 2: Como usar at no Pandas<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como usar <strong>.at<\/strong> para acessar o valor no DataFrame localizado na posi\u00e7\u00e3o 0 do \u00edndice da coluna do ponto:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#select value located at index position 0 of the points column\n<span style=\"color: #000000;\">df. <span style=\"color: #3366ff;\">at<\/span> [0, ' <span style=\"color: #ff0000;\">points<\/span> ']\n\n18<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Isso retorna um valor de <strong>18<\/strong> .<\/span><\/p>\n<p> <span style=\"color: #000000;\">Entretanto, suponha que tentamos usar <b>at<\/b> para acessar as linhas entre os valores de \u00edndice 0 e 4, bem como as colunas de pontos e assist\u00eancias:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#try to select rows between index values 0 and 4 and columns 'points' and 'assists'\n<span style=\"color: #000000;\">df. <span style=\"color: #3366ff;\">at<\/span> [0:4, [' <span style=\"color: #ff0000;\">points<\/span> ', ' <span style=\"color: #ff0000;\">assists<\/span> ']]<\/span>\n\n<span style=\"color: #000000;\"><span style=\"color: #ff0000;\">TypeError<\/span> : unhashable type: 'list'\n<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Estamos recebendo um erro porque a fun\u00e7\u00e3o <strong>at<\/strong> n\u00e3o consegue aceitar v\u00e1rias linhas ou colunas como argumentos de entrada.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong><span style=\"color: #000000;\">Conclus\u00e3o<\/span><\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">Quando voc\u00ea deseja acessar um \u00fanico valor em um DataFrame do pandas, as fun\u00e7\u00f5es <strong>loc<\/strong> e <strong>at<\/strong> funcionar\u00e3o bem.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Por\u00e9m, quando voc\u00ea deseja acessar um grupo de linhas e colunas, apenas a fun\u00e7\u00e3o <strong>loc<\/strong> \u00e9 capaz de faz\u00ea-lo.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Relacionado:<\/strong> <a href=\"https:\/\/statorials.org\/pt\/pandas-loc-vs-iloc\/\" target=\"_blank\" rel=\"noopener\">Pandas loc vs iloc: qual a diferen\u00e7a?<\/a><\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Recursos adicionais<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">Os tutoriais a seguir explicam como realizar outras opera\u00e7\u00f5es comuns em pandas:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/pt\/pandas-localizam-multiplas-condicoes\/\" target=\"_blank\" rel=\"noopener\">Como selecionar linhas com base em m\u00faltiplas condi\u00e7\u00f5es usando Pandas Loc<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/pandas-selecionam-linhas-com-base-nos-valores-das-colunas\/\">Como selecionar linhas com base nos valores das colunas no Pandas<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/pandas-selecionam-linhas-por-indice\/\" target=\"_blank\" rel=\"noopener\">Como selecionar linhas por \u00edndice no Pandas<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Quando se trata de selecionar linhas e colunas de um DataFrame do pandas, .loc e .at s\u00e3o duas fun\u00e7\u00f5es comumente usadas. Aqui est\u00e1 a diferen\u00e7a sutil entre as duas fun\u00e7\u00f5es: .loc pode receber v\u00e1rias linhas e colunas como argumentos de entrada .at s\u00f3 pode receber uma \u00fanica linha e coluna como argumentos de entrada Os [&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-3274","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>Pandas vs loc: qual a diferen\u00e7a? - Estatoriais<\/title>\n<meta name=\"description\" content=\"Este tutorial explica a diferen\u00e7a entre as fun\u00e7\u00f5es at e loc no pandas, com v\u00e1rios exemplos.\" \/>\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\/pandas-a-vs-loc\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pandas vs loc: qual a diferen\u00e7a? - Estatoriais\" \/>\n<meta property=\"og:description\" content=\"Este tutorial explica a diferen\u00e7a entre as fun\u00e7\u00f5es at e loc no pandas, com v\u00e1rios exemplos.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/pandas-a-vs-loc\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-18T08:36:45+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\/pandas-a-vs-loc\/\",\"url\":\"https:\/\/statorials.org\/pt\/pandas-a-vs-loc\/\",\"name\":\"Pandas vs loc: qual a diferen\u00e7a? - Estatoriais\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-18T08:36:45+00:00\",\"dateModified\":\"2023-07-18T08:36:45+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Este tutorial explica a diferen\u00e7a entre as fun\u00e7\u00f5es at e loc no pandas, com v\u00e1rios exemplos.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/pandas-a-vs-loc\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/pandas-a-vs-loc\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/pandas-a-vs-loc\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Pandas vs loc: qual a diferen\u00e7a?\"}]},{\"@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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