{"id":2046,"date":"2023-07-23T22:48:45","date_gmt":"2023-07-23T22:48:45","guid":{"rendered":"https:\/\/statorials.org\/pl\/pandy-lub\/"},"modified":"2023-07-23T22:48:45","modified_gmt":"2023-07-23T22:48:45","slug":"pandy-lub","status":"publish","type":"post","link":"https:\/\/statorials.org\/pl\/pandy-lub\/","title":{"rendered":"Jak korzysta\u0107 z funkcji where() w pandach (z przyk\u0142adami)"},"content":{"rendered":"

<\/p>\n

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Funkcji Where()<\/strong> mo\u017cna u\u017cy\u0107 do zast\u0105pienia okre\u015blonych warto\u015bci w ramce DataFrame pandy.<\/span><\/p>\n

Ta funkcja wykorzystuje nast\u0119puj\u0105c\u0105 podstawow\u0105 sk\u0142adni\u0119:<\/span><\/p>\n

 df. where<\/span> (cond, other=nan)\n<\/strong><\/pre>\n
 Dla ka\u017cdej warto\u015bci w ramce danych pandy, gdzie cond<\/strong> ma warto\u015b\u0107 True, zachowywana jest oryginalna warto\u015b\u0107.<\/span><\/p>\n
 Dla ka\u017cdej warto\u015bci, gdzie cond<\/strong> ma warto\u015b\u0107 False, oryginalna warto\u015b\u0107 jest zast\u0119powana warto\u015bci\u0105 okre\u015blon\u0105 przez drugi<\/strong> argument.<\/span><\/p>\n
 Poni\u017csze przyk\u0142ady pokazuj\u0105, jak w praktyce u\u017cywa\u0107 tej sk\u0142adni z nast\u0119puj\u0105c\u0105 ramk\u0105 DataFrame pand:<\/span><\/p>\n
 import<\/span> pandas as<\/span> pd\n\n#define DataFrame\ndf = pd. DataFrame<\/span> ({' points<\/span> ': [25, 12, 15, 14, 19, 23, 25, 29],\n                   ' assists<\/span> ': [5, 7, 7, 9, 12, 9, 9, 4],\n                   ' rebounds<\/span> ': [11, 8, 10, 6, 6, 5, 9, 12]})<\/span>\n\n#view DataFrame<\/span>\ndf\n\npoints assists rebounds\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
 Przyk\u0142ad 1: Zamie\u0144 warto\u015bci w ca\u0142ej DataFrame<\/strong><\/span><\/h3>\n
 Poni\u017cszy kod pokazuje, jak u\u017cy\u0107 funkcji Where()<\/strong> do zast\u0105pienia wszystkich warto\u015bci, kt\u00f3re nie spe\u0142niaj\u0105 okre\u015blonego warunku w ca\u0142ej ramce DataFrame pandy, warto\u015bci\u0105 NaN.<\/span><\/p>\n
 #keep values that are greater than 7, but replace all others with NaN<\/span>\ndf. where<\/span> (df>7)\n\n\tpoints assists rebounds\n0 25 NaN 11.0\n1 12 NaN 8.0\n2 15 NaN 10.0\n3 14 9.0 NaN\n4 19 12.0 NaN\n5 23 9.0 NaN\n6 25 9.0 9.0\n7 29 NaN 12.0\n<\/strong><\/pre>\n
 Drugiego<\/strong> argumentu mo\u017cemy tak\u017ce u\u017cy\u0107 do zast\u0105pienia warto\u015bci czym\u015b innym ni\u017c NaN.<\/span><\/p>\n
 #keep values that are greater than 7, but replace all others with 'low'<\/span>\ndf. where<\/span> (df>7, other=' low<\/span> ')\n\n\tpoints assists rebounds\n0 25 low 11\n1 12 low 8\n2 15 low 10\n3 14 9 low\n4 19 12 low\n5 23 9 low\n6 25 9 9\n7 29 low 12\n<\/strong><\/pre>\n
 Przyk\u0142ad 2: Zamie\u0144 warto\u015bci w okre\u015blonej kolumnie DataFrame<\/strong><\/span><\/h3>\n
 Poni\u017cszy kod pokazuje, jak u\u017cy\u0107 funkcji Where()<\/strong> do zamiany wszystkich warto\u015bci, kt\u00f3re nie spe\u0142niaj\u0105 okre\u015blonego warunku w okre\u015blonej kolumnie DataFrame.<\/span><\/p>\n
 #keep values greater than 15 in 'points' column, but replace others with 'low'<\/span>\ndf[' points<\/span> '] = df[' points<\/span> ']. where<\/span> (df[' points<\/span> ']>15, other=' low<\/span> ')\n\n#view DataFrame<\/span>\ndf\n\n\tpoints assists rebounds\n0 25 5 11\n1 low 7 8\n2 low 7 10\n3 low 9 6\n4 19 12 6\n5 23 9 5\n6 25 9 9\n7 29 4 12<\/strong><\/pre>\n
 Pe\u0142n\u0105 dokumentacj\u0119 online funkcji pandaswhere()<\/strong> mo\u017cna znale\u017a\u0107 tutaj<\/a> .<\/span><\/p>\n
 Dodatkowe zasoby<\/strong><\/span><\/h3>\n
 Poni\u017csze samouczki wyja\u015bniaj\u0105, jak korzysta\u0107 z innych typowych funkcji pand:<\/span><\/p>\n
 Jak korzysta\u0107 z funkcji opisu () w Pandach<\/a>
 Jak korzysta\u0107 z funkcji idxmax() w Pandach<\/a>
 Jak zastosowa\u0107 funkcj\u0119 do wybranych kolumn w Pandach<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
Funkcji Where() mo\u017cna u\u017cy\u0107 do zast\u0105pienia okre\u015blonych warto\u015bci w ramce DataFrame pandy. Ta funkcja wykorzystuje nast\u0119puj\u0105c\u0105 podstawow\u0105 sk\u0142adni\u0119: df. where (cond, other=nan) Dla ka\u017cdej warto\u015bci w ramce danych pandy, gdzie cond ma warto\u015b\u0107 True, zachowywana jest oryginalna warto\u015b\u0107. Dla ka\u017cdej warto\u015bci, gdzie cond ma warto\u015b\u0107 False, oryginalna warto\u015b\u0107 jest zast\u0119powana warto\u015bci\u0105 okre\u015blon\u0105 przez drugi argument. […]<\/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-2046","post","type-post","status-publish","format-standard","hentry","category-przewodnik"],"yoast_head":"\nJak korzysta\u0107 z funkcji Where() w Pandach (z przyk\u0142adami) \u2013 Statologia<\/title>\n<meta name=\"description\" content=\"W tym samouczku wyja\u015bniono, jak u\u017cywa\u0107 funkcji Where() w ramce DataFrame pandy, 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-lub\/\" \/>\n<meta property=\"og:locale\" content=\"pl_PL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Jak korzysta\u0107 z funkcji Where() w Pandach (z przyk\u0142adami) \u2013 Statologia\" \/>\n<meta property=\"og:description\" content=\"W tym samouczku wyja\u015bniono, jak u\u017cywa\u0107 funkcji Where() w ramce DataFrame pandy, podaj\u0105c kilka przyk\u0142ad\u00f3w.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pl\/pandy-lub\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-23T22:48:45+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=\"2 minuty\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pl\/pandy-lub\/\",\"url\":\"https:\/\/statorials.org\/pl\/pandy-lub\/\",\"name\":\"Jak korzysta\u0107 z funkcji Where() w Pandach (z przyk\u0142adami) \u2013 Statologia\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pl\/#website\"},\"datePublished\":\"2023-07-23T22:48:45+00:00\",\"dateModified\":\"2023-07-23T22:48:45+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pl\/#\/schema\/person\/6484727a4612df3e69f016c3129c6965\"},\"description\":\"W tym samouczku wyja\u015bniono, jak u\u017cywa\u0107 funkcji Where() w ramce DataFrame pandy, podaj\u0105c kilka przyk\u0142ad\u00f3w.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pl\/pandy-lub\/#breadcrumb\"},\"inLanguage\":\"pl-PL\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pl\/pandy-lub\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pl\/pandy-lub\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Dom\",\"item\":\"https:\/\/statorials.org\/pl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Jak korzysta\u0107 z funkcji where() w pandach (z przyk\u0142adami)\"}]},{\"@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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