{"id":1980,"date":"2023-07-24T05:32:17","date_gmt":"2023-07-24T05:32:17","guid":{"rendered":"https:\/\/statorials.org\/nl\/pandas-instelling-met-kopieerwaarschuwing\/"},"modified":"2023-07-24T05:32:17","modified_gmt":"2023-07-24T05:32:17","slug":"pandas-instelling-met-kopieerwaarschuwing","status":"publish","type":"post","link":"https:\/\/statorials.org\/nl\/pandas-instelling-met-kopieerwaarschuwing\/","title":{"rendered":"Hoe op te lossen in panda&#39;s: settingwithcopywarning"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Een waarschuwing die u kunt tegenkomen bij het gebruik van panda&#8217;s is:<\/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;\">Deze waarschuwing verschijnt wanneer panda&#8217;s iets tegenkomen dat ketentoewijzing wordt genoemd: de combinatie van ketening en toewijzing in \u00e9\u00e9n stap.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Het is belangrijk op te merken dat dit slechts een <em>waarschuwing<\/em> is en geen fout. Uw code blijft actief, maar de resultaten zijn mogelijk niet altijd wat u had verwacht.<\/span><\/p>\n<p> <span style=\"color: #000000;\">De eenvoudigste manier om deze waarschuwing te onderdrukken is door het volgende stukje code te gebruiken:<\/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;\">Het volgende voorbeeld laat zien hoe u in de praktijk op deze waarschuwing kunt reageren.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Hoe de waarschuwing te reproduceren<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Stel dat we de volgende panda&#8217;s DataFrame maken:<\/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;\">Stel nu dat we een nieuw DataFrame maken dat alleen kolom &#8222;A&#8220; uit het oorspronkelijke DataFrame bevat en elke waarde in kolom &#8222;A&#8220; delen door 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;\">We ontvangen het <strong>SettingWithCopyWarning-<\/strong> bericht omdat we nieuwe waarden instellen voor kolom &#8222;A&#8220; op een &#8222;segment&#8220; van het originele DataFrame.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Als we echter naar het nieuwe DataFrame kijken dat we hebben gemaakt, zullen we zien dat elke waarde feitelijk met succes door 2 is gedeeld:<\/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;\">Ondanks dat we een waarschuwingsbericht kregen, deden de panda\u2019s nog steeds wat we dachten dat ze zouden doen.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Hoe de waarschuwing te vermijden<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Om deze waarschuwing te vermijden, wordt aanbevolen om de syntaxis <strong>.loc[row indexer, col indexer]<\/strong> als volgt te gebruiken:<\/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;\">Het nieuwe DataFrame bevat alle waarden uit kolom \u2018A\u2019 in het originele DataFrame, gedeeld door twee, en er verschijnen geen waarschuwingsberichten.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Als we willen voorkomen dat het waarschuwingsbericht wordt weergegeven, kunnen we het volgende stukje code gebruiken:<\/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;\">Voor een gedetailleerde uitleg waarom ketentoewijzing moet worden vermeden, raadpleegt u de <a href=\"https:\/\/pandas.pydata.org\/pandas-docs\/version\/0.22\/indexing.html\" target=\"_blank\" rel=\"noopener\">online panda-documentatie<\/a> .<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Aanvullende bronnen<\/strong><\/span><\/h3>\n<p> <a href=\"https:\/\/statorials.org\/nl\/geen-module-met-de-naam-pandas\/\" target=\"_blank\" rel=\"noopener\">Oplossing: Geen module met de naam pandas<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/geen-module-met-de-naam-numpy\/\" target=\"_blank\" rel=\"noopener\">Oplossing: geen module met de naam numpy<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/kolommen-overlappen-elkaar-maar-er-is-geen-achtervoegsel-opgegeven\/\" target=\"_blank\" rel=\"noopener\">Oplossing: Kolommen overlappen elkaar, maar er is geen achtervoegsel opgegeven<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Een waarschuwing die u kunt tegenkomen bij het gebruik van panda&#8217;s is: SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame. Deze waarschuwing verschijnt wanneer panda&#8217;s iets tegenkomen dat ketentoewijzing wordt genoemd: de combinatie van ketening en toewijzing in \u00e9\u00e9n stap. Het is belangrijk op te merken [&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-1980","post","type-post","status-publish","format-standard","hentry","category-gids"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Hoe op te lossen in Panda&#039;s: SettingWithCopyWarning \u2013 Statorials<\/title>\n<meta name=\"description\" content=\"In deze tutorial wordt uitgelegd hoe u de volgende waarschuwing in panda&#039;s kunt oplossen:\" \/>\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\/nl\/pandas-instelling-met-kopieerwaarschuwing\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hoe op te lossen in Panda&#039;s: SettingWithCopyWarning \u2013 Statorials\" \/>\n<meta property=\"og:description\" content=\"In deze tutorial wordt uitgelegd hoe u de volgende waarschuwing in panda&#039;s kunt oplossen:\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/nl\/pandas-instelling-met-kopieerwaarschuwing\/\" \/>\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.benjamin anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Verfasst von\" \/>\n\t<meta name=\"twitter:data1\" content=\"Dr.benjamin anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Gesch\u00e4tzte Lesezeit\" \/>\n\t<meta name=\"twitter:data2\" content=\"2\u00a0Minuten\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/nl\/pandas-instelling-met-kopieerwaarschuwing\/\",\"url\":\"https:\/\/statorials.org\/nl\/pandas-instelling-met-kopieerwaarschuwing\/\",\"name\":\"Hoe op te lossen in Panda&#39;s: SettingWithCopyWarning \u2013 Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/nl\/#website\"},\"datePublished\":\"2023-07-24T05:32:17+00:00\",\"dateModified\":\"2023-07-24T05:32:17+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219\"},\"description\":\"In deze tutorial wordt uitgelegd hoe u de volgende waarschuwing in panda&#39;s kunt oplossen:\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/nl\/pandas-instelling-met-kopieerwaarschuwing\/#breadcrumb\"},\"inLanguage\":\"de\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/nl\/pandas-instelling-met-kopieerwaarschuwing\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/nl\/pandas-instelling-met-kopieerwaarschuwing\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Thuis\",\"item\":\"https:\/\/statorials.org\/nl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Hoe op te lossen in panda&#39;s: settingwithcopywarning\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/nl\/#website\",\"url\":\"https:\/\/statorials.org\/nl\/\",\"name\":\"Statorials\",\"description\":\"Uw gids voor statistische competentie\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/nl\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"de\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219\",\"name\":\"Dr.benjamin anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"de\",\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/image\/\",\"url\":\"http:\/\/statorials.org\/nl\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"http:\/\/statorials.org\/nl\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Dr.benjamin anderson\"},\"description\":\"Ik ben Benjamin, een gepensioneerde hoogleraar statistiek die nu een toegewijde Statorials-lesgever is. 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