{"id":1979,"date":"2023-07-24T05:32:17","date_gmt":"2023-07-24T05:32:17","guid":{"rendered":"https:\/\/statorials.org\/pt\/configuracao-de-pandas-com-aviso-de-copia\/"},"modified":"2023-07-24T05:32:17","modified_gmt":"2023-07-24T05:32:17","slug":"configuracao-de-pandas-com-aviso-de-copia","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/configuracao-de-pandas-com-aviso-de-copia\/","title":{"rendered":"Como corrigir no pandas: settingwithcopywarning"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Um aviso que voc\u00ea pode encontrar ao usar pandas \u00e9:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>SettingWithCopyWarning: \nA value is trying to be set on a copy of a slice from a DataFrame.\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Este aviso aparece quando os pandas encontram algo chamado atribui\u00e7\u00e3o em cadeia \u2013 a combina\u00e7\u00e3o de encadeamento e atribui\u00e7\u00e3o em uma \u00fanica etapa.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\u00c9 importante observar que isso \u00e9 apenas um <em>aviso<\/em> e n\u00e3o um erro. Seu c\u00f3digo continuar\u00e1 em execu\u00e7\u00e3o, mas os resultados nem sempre ser\u00e3o os esperados.<\/span><\/p>\n<p> <span style=\"color: #000000;\">A maneira mais f\u00e1cil de suprimir esse aviso \u00e9 usar o seguinte trecho de c\u00f3digo:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>p.d. <span style=\"color: #3366ff;\">options<\/span> . <span style=\"color: #3366ff;\">fashion<\/span> . <span style=\"color: #3366ff;\">chained_assignment<\/span> = <span style=\"color: #008000;\">None<\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">O exemplo a seguir mostra como responder a esse aviso na pr\u00e1tica.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Como reproduzir o aviso<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Suponha que criemos o seguinte DataFrame do pandas:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #107d3f;\">import<\/span> pandas <span style=\"color: #107d3f;\">as<\/span> pd\n\n<span style=\"color: #008080;\">#createDataFrame\n<span style=\"color: #000000;\">df = pd. <span style=\"color: #3366ff;\">DataFrame<\/span> ({' <span style=\"color: #ff0000;\">A<\/span> ': [25, 12, 15, 14, 19, 23, 25, 29],\n                   ' <span style=\"color: #ff0000;\">B<\/span> ': [5, 7, 7, 9, 12, 9, 9, 4],\n                   ' <span style=\"color: #ff0000;\">C<\/span> ': [11, 8, 10, 6, 6, 5, 9, 12]})<\/span>\n\n#view DataFrame\n<span style=\"color: #000000;\">df<\/span>\n<\/span>\n\tA B C\n0 25 5 11\n1 12 7 8\n2 15 7 10\n3 14 9 6\n4 19 12 6\n5 23 9 5\n6 25 9 9\n7 29 4 12<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Agora suponha que criemos um novo DataFrame que contenha apenas a coluna \u201cA\u201d do DataFrame original e dividamos cada valor na coluna \u201cA\u201d por 2:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008080;\">#define new DataFrame\n<\/span>df2 = df[[' <span style=\"color: #ff0000;\">A<\/span> ']]\n\n<\/span>#divide all values in column 'A' by 2\n<span style=\"color: #000000;\">df2[' <span style=\"color: #ff0000;\">A<\/span> '] = df[' <span style=\"color: #ff0000;\">A<\/span> '] \/ 2<\/span>\n\n<span style=\"color: #000000;\">\/srv\/conda\/envs\/notebook\/lib\/python3.7\/site-packages\/ipykernel_launcher.py:2:\nSettingWithCopyWarning: \nA value is trying to be set on a copy of a slice from a DataFrame.\nTry using .loc[row_indexer,col_indexer] = value instead\n<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Recebemos a mensagem <strong>SettingWithCopyWarning<\/strong> porque estamos definindo novos valores para a coluna \u201cA\u201d em uma \u201cfatia\u201d do DataFrame original.<\/span><\/p>\n<p> <span style=\"color: #000000;\">No entanto, se olharmos para o novo DataFrame que criamos, veremos que cada valor foi dividido com sucesso por 2:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008080;\">#view new DataFrame\n<\/span>df2\n\n     HAS\n0 12.5\n1 6.0\n2 7.5\n3 7.0\n4 9.5\n5 11.5\n6 12.5\n7 14.5\n<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Embora tenhamos recebido uma mensagem de aviso, os pandas ainda fizeram o que pens\u00e1vamos que fariam.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Como evitar o aviso<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Para evitar esse aviso, \u00e9 recomendado usar a sintaxe <strong>.loc[row indexer, col indexer]<\/strong> da seguinte forma:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008080;\">#define new DataFrame\n<\/span>df2 = df. <span style=\"color: #3366ff;\">loc<\/span> [:,[' <span style=\"color: #ff0000;\">A<\/span> ']]\n\n<span style=\"color: #008080;\">#divide each value in column 'A' by 2\n<\/span>df2[' <span style=\"color: #ff0000;\">A<\/span> '] = df[' <span style=\"color: #ff0000;\">A<\/span> '] \/ 2\n\n<span style=\"color: #008080;\">#view result\n<\/span>df2\n\n     HAS\n0 12.5\n1 6.0\n2 7.5\n3 7.0\n4 9.5\n5 11.5\n6 12.5\n7 14.5\n<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">O novo DataFrame cont\u00e9m todos os valores da coluna \u201cA\u201d do DataFrame original, divididos por dois, e nenhuma mensagem de aviso aparece.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Se quisermos evitar que a mensagem de aviso seja exibida, podemos usar o seguinte trecho de c\u00f3digo:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#prevent SettingWithCopyWarning message from appearing\n<\/span>p.d. <span style=\"color: #3366ff;\">options<\/span> . <span style=\"color: #3366ff;\">fashion<\/span> . <span style=\"color: #3366ff;\">chained_assignment<\/span> = <span style=\"color: #008000;\">None<\/span>\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Para obter uma explica\u00e7\u00e3o detalhada de por que a atribui\u00e7\u00e3o de cadeia deve ser evitada, consulte a <a href=\"https:\/\/pandas.pydata.org\/pandas-docs\/version\/0.22\/indexing.html\" target=\"_blank\" rel=\"noopener\">documenta\u00e7\u00e3o on-line do pandas<\/a> .<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Recursos adicionais<\/strong><\/span><\/h3>\n<p> <a href=\"https:\/\/statorials.org\/pt\/nenhum-modulo-chamado-pandas\/\" target=\"_blank\" rel=\"noopener\">Como corrigir: Nenhum m\u00f3dulo chamado pandas<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/nenhum-modulo-chamado-numpy\/\" target=\"_blank\" rel=\"noopener\">Como corrigir: nenhum m\u00f3dulo chamado numpy<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/colunas-se-sobrepoem-mas-nenhum-sufixo-e-especificado\/\" target=\"_blank\" rel=\"noopener\">Como corrigir: as colunas se sobrep\u00f5em, mas nenhum sufixo \u00e9 especificado<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Um aviso que voc\u00ea pode encontrar ao usar pandas \u00e9: SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame. Este aviso aparece quando os pandas encontram algo chamado atribui\u00e7\u00e3o em cadeia \u2013 a combina\u00e7\u00e3o de encadeamento e atribui\u00e7\u00e3o em uma \u00fanica etapa. \u00c9 importante observar que isso [&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-1979","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 corrigir em Pandas: SettingWithCopyWarning \u2013 Estatologia<\/title>\n<meta name=\"description\" content=\"Este tutorial explica como corrigir o seguinte aviso no pandas:\" \/>\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\/configuracao-de-pandas-com-aviso-de-copia\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como corrigir em Pandas: SettingWithCopyWarning \u2013 Estatologia\" \/>\n<meta property=\"og:description\" content=\"Este tutorial explica como corrigir o seguinte aviso no pandas:\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/configuracao-de-pandas-com-aviso-de-copia\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-24T05:32:17+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\/configuracao-de-pandas-com-aviso-de-copia\/\",\"url\":\"https:\/\/statorials.org\/pt\/configuracao-de-pandas-com-aviso-de-copia\/\",\"name\":\"Como corrigir em Pandas: SettingWithCopyWarning \u2013 Estatologia\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-24T05:32:17+00:00\",\"dateModified\":\"2023-07-24T05:32:17+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Este tutorial explica como corrigir o seguinte aviso no pandas:\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/configuracao-de-pandas-com-aviso-de-copia\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/configuracao-de-pandas-com-aviso-de-copia\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/configuracao-de-pandas-com-aviso-de-copia\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Como corrigir no pandas: settingwithcopywarning\"}]},{\"@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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