{"id":2864,"date":"2023-07-20T08:32:04","date_gmt":"2023-07-20T08:32:04","guid":{"rendered":"https:\/\/statorials.org\/pl\/pandy-zamien-pusty-ciag-nan\/"},"modified":"2023-07-20T08:32:04","modified_gmt":"2023-07-20T08:32:04","slug":"pandy-zamien-pusty-ciag-nan","status":"publish","type":"post","link":"https:\/\/statorials.org\/pl\/pandy-zamien-pusty-ciag-nan\/","title":{"rendered":"Pandy: jak zast\u0105pi\u0107 puste ci\u0105gi znak\u00f3w nan"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Mo\u017cesz u\u017cy\u0107 nast\u0119puj\u0105cej sk\u0142adni, aby zast\u0105pi\u0107 puste ci\u0105gi warto\u015bciami NaN w pandach:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>df = df. <span style=\"color: #3366ff;\">replace<\/span> ( <span style=\"color: #ff0000;\">r'^\\s*$'<\/span> , np. <span style=\"color: #3366ff;\">nan<\/span> , regex= <span style=\"color: #008000;\">True<\/span> )<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Poni\u017cszy przyk\u0142ad pokazuje, jak zastosowa\u0107 t\u0119 sk\u0142adni\u0119 w praktyce.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Powi\u0105zane:<\/strong> <a href=\"https:\/\/statorials.org\/pl\/pandy-zastepuja-nan-stringami\/\" target=\"_blank\" rel=\"noopener\">Jak zast\u0105pi\u0107 warto\u015bci NaN ci\u0105giem w Pandach<\/a><\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Przyk\u0142ad: Zamie\u0144 puste ci\u0105gi na NaN<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Za\u0142\u00f3\u017cmy, \u017ce mamy nast\u0119puj\u0105c\u0105 ramk\u0119 danych pand, kt\u00f3ra zawiera informacje o r\u00f3\u017cnych koszykarzach:<\/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', ' ', 'D', 'E', ' ', 'G', 'H'],\n                   ' <span style=\"color: #ff0000;\">position<\/span> ': [' ', 'G', 'G', 'F', 'F', ' ', 'C', 'C'],\n                   ' <span style=\"color: #ff0000;\">points<\/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>df\n\n\tteam position points rebounds\n0 to 5 11\n1 B G 7 8\n2 G 7 10\n3 D F 9 6\n4 E F 12 6\n5 9 5\n6 G C 9 9\n7 H C 4 12<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Zwr\u00f3\u0107 uwag\u0119, \u017ce w kolumnach <strong>zespo\u0142u<\/strong> i <strong>pozycji<\/strong> znajduje si\u0119 kilka pustych ci\u0105g\u00f3w znak\u00f3w.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Mo\u017cemy u\u017cy\u0107 nast\u0119puj\u0105cej sk\u0142adni, aby zast\u0105pi\u0107 te puste ci\u0105gi warto\u015bciami NaN:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008000;\">import<\/span> numpy <span style=\"color: #008000;\">as<\/span> np<\/span>\n\n<span style=\"color: #000000;\"><span style=\"color: #008080;\">#replace empty values with NaN\n<\/span>df = df. <span style=\"color: #3366ff;\">replace<\/span> ( <span style=\"color: #ff0000;\">r'^\\s*$'<\/span> , np. <span style=\"color: #3366ff;\">nan<\/span> , regex= <span style=\"color: #008000;\">True<\/span> )\n<\/span>\n#view updated DataFrame\n<span style=\"color: #000000;\">df\n<\/span>\n<span style=\"color: #000000;\">team position<\/span> <span style=\"color: #000000;\">points rebounds\n0 A NaN<\/span> <span style=\"color: #000000;\">5 11\n1 B G<\/span> <span style=\"color: #000000;\">7 8\n2 NaN G<\/span> <span style=\"color: #000000;\">7 10\n3 D F<\/span> <span style=\"color: #000000;\">9 6\n4 E F<\/span> <span style=\"color: #000000;\">12 6\n5 NaN NaN<\/span> <span style=\"color: #000000;\">9 5\n6 G C<\/span> <span style=\"color: #000000;\">9 9\n7 H C<\/span> <span style=\"color: #000000;\">4 127<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><span style=\"color: #000000;\">Zauwa\u017c, \u017ce ka\u017cdy z pustych ci\u0105g\u00f3w zosta\u0142 zast\u0105piony przez NaN.<\/span><\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Uwaga<\/strong> : Pe\u0142n\u0105 dokumentacj\u0119 funkcji <strong>zamiany<\/strong> w pandach znajdziesz <a href=\"https:\/\/pandas.pydata.org\/docs\/reference\/api\/pandas.DataFrame.replace.html\" target=\"_blank\" rel=\"noopener\">tutaj<\/a> .<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Dodatkowe zasoby<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Poni\u017csze samouczki wyja\u015bniaj\u0105, jak wykonywa\u0107 inne typowe zadania w pandach:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/pl\/pandy-przypisuje-brakujace-wartosci\/\" target=\"_blank\" rel=\"noopener\">Jak przypisa\u0107 brakuj\u0105ce warto\u015bci w pandach<\/a><br \/> <a href=\"https:\/\/statorials.org\/pl\/pandy-licza-brakujace-wartosci\/\" target=\"_blank\" rel=\"noopener\">Jak policzy\u0107 brakuj\u0105ce warto\u015bci w pandach<\/a><br \/> <a href=\"https:\/\/statorials.org\/pl\/pandy-fillna-ze-srednia\/\" target=\"_blank\" rel=\"noopener\">Jak wype\u0142ni\u0107 warto\u015bci NaN \u015bredni\u0105 w pandach<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Mo\u017cesz u\u017cy\u0107 nast\u0119puj\u0105cej sk\u0142adni, aby zast\u0105pi\u0107 puste ci\u0105gi warto\u015bciami NaN w pandach: df = df. replace ( r&#8217;^\\s*$&#8217; , np. nan , regex= True ) Poni\u017cszy przyk\u0142ad pokazuje, jak zastosowa\u0107 t\u0119 sk\u0142adni\u0119 w praktyce. Powi\u0105zane: Jak zast\u0105pi\u0107 warto\u015bci NaN ci\u0105giem w Pandach Przyk\u0142ad: Zamie\u0144 puste ci\u0105gi na NaN Za\u0142\u00f3\u017cmy, \u017ce mamy nast\u0119puj\u0105c\u0105 ramk\u0119 danych pand, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-2864","post","type-post","status-publish","format-standard","hentry","category-przewodnik"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Pandy: Jak zast\u0105pi\u0107 puste ci\u0105gi znak\u00f3w NaN \u2013 Statorials<\/title>\n<meta name=\"description\" content=\"W tym samouczku wyja\u015bniono, jak zast\u0105pi\u0107 puste ci\u0105gi znak\u00f3w NaN w pandach, podaj\u0105c kilka przyk\u0142ad\u00f3w.\" \/>\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\/pl\/pandy-zamien-pusty-ciag-nan\/\" \/>\n<meta property=\"og:locale\" content=\"pl_PL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pandy: Jak zast\u0105pi\u0107 puste ci\u0105gi znak\u00f3w NaN \u2013 Statorials\" \/>\n<meta property=\"og:description\" content=\"W tym samouczku wyja\u015bniono, jak zast\u0105pi\u0107 puste ci\u0105gi znak\u00f3w NaN w pandach, podaj\u0105c kilka przyk\u0142ad\u00f3w.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pl\/pandy-zamien-pusty-ciag-nan\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-20T08:32:04+00:00\" \/>\n<meta name=\"author\" content=\"Benjamin Anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Napisane przez\" \/>\n\t<meta name=\"twitter:data1\" content=\"Benjamin Anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Szacowany czas czytania\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minuta\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pl\/pandy-zamien-pusty-ciag-nan\/\",\"url\":\"https:\/\/statorials.org\/pl\/pandy-zamien-pusty-ciag-nan\/\",\"name\":\"Pandy: Jak zast\u0105pi\u0107 puste ci\u0105gi znak\u00f3w NaN \u2013 Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pl\/#website\"},\"datePublished\":\"2023-07-20T08:32:04+00:00\",\"dateModified\":\"2023-07-20T08:32:04+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pl\/#\/schema\/person\/6484727a4612df3e69f016c3129c6965\"},\"description\":\"W tym samouczku wyja\u015bniono, jak zast\u0105pi\u0107 puste ci\u0105gi znak\u00f3w NaN w pandach, podaj\u0105c kilka przyk\u0142ad\u00f3w.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pl\/pandy-zamien-pusty-ciag-nan\/#breadcrumb\"},\"inLanguage\":\"pl-PL\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pl\/pandy-zamien-pusty-ciag-nan\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pl\/pandy-zamien-pusty-ciag-nan\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Dom\",\"item\":\"https:\/\/statorials.org\/pl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Pandy: jak zast\u0105pi\u0107 puste ci\u0105gi znak\u00f3w nan\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/pl\/#website\",\"url\":\"https:\/\/statorials.org\/pl\/\",\"name\":\"Statorials\",\"description\":\"Tw\u00f3j przewodnik po kompetencjach statystycznych!\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/pl\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"pl-PL\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/pl\/#\/schema\/person\/6484727a4612df3e69f016c3129c6965\",\"name\":\"Benjamin Anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"pl-PL\",\"@id\":\"https:\/\/statorials.org\/pl\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/statorials.org\/pl\/wp-content\/uploads\/2023\/11\/Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"https:\/\/statorials.org\/pl\/wp-content\/uploads\/2023\/11\/Benjamin-Anderson-96x96.jpg\",\"caption\":\"Benjamin Anderson\"},\"description\":\"Cze\u015b\u0107, jestem Benjamin i jestem emerytowanym profesorem statystyki, kt\u00f3ry zosta\u0142 oddanym nauczycielem Statorials. 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