{"id":2590,"date":"2023-07-21T14:33:38","date_gmt":"2023-07-21T14:33:38","guid":{"rendered":"https:\/\/statorials.org\/pl\/pandy-w-pierwszym-rzedzie-kazdej-grupy\/"},"modified":"2023-07-21T14:33:38","modified_gmt":"2023-07-21T14:33:38","slug":"pandy-w-pierwszym-rzedzie-kazdej-grupy","status":"publish","type":"post","link":"https:\/\/statorials.org\/pl\/pandy-w-pierwszym-rzedzie-kazdej-grupy\/","title":{"rendered":"Pandy: jak zdoby\u0107 pierwszy rz\u0105d ka\u017cdej grupy"},"content":{"rendered":"

<\/p>\n

\n

Mo\u017cesz u\u017cy\u0107 nast\u0119puj\u0105cej podstawowej sk\u0142adni, aby uzyska\u0107 pierwszy wiersz ka\u017cdej grupy w ramce DataFrame pandy:<\/span><\/p>\n

 df. groupby<\/span> (' column_name<\/span> '). nth<\/span> ( 0<\/span> )\n<\/strong><\/pre>\n
 Poni\u017cszy przyk\u0142ad pokazuje, jak zastosowa\u0107 t\u0119 sk\u0142adni\u0119 w praktyce.<\/span><\/p>\n
 Przyk\u0142ad: Zdob\u0105d\u017a pierwszy wiersz ka\u017cdej grupy w Pandach<\/strong><\/span><\/h3>\n
 Za\u0142\u00f3\u017cmy, \u017ce mamy nast\u0119puj\u0105c\u0105 ramk\u0119 DataFrame pand:<\/span><\/p>\n
 import<\/span> pandas as<\/span> pd\n\n#createDataFrame\n<\/span>df = pd. DataFrame<\/span> ({' team<\/span> ': ['A', 'A', 'B', 'B', 'B', 'C', 'C', 'C'],\n                   ' points<\/span> ': [18, 22, 19, 14, 14, 11, 20, 29],\n                   ' assists<\/span> ': [5, 19, 14, 8, 9, 12, 13, 8]})\n\n#view DataFrame\n<\/span>df\n\n\tteam points assists\n0 to 18 5\n1 To 22 19\n2 B 19 14\n3 B 14 8\n4 B 14 9\n5 C 11 12\n6 C 20 13\n7 C 29 8\n<\/strong><\/span><\/pre>\n
 Mo\u017cemy u\u017cy\u0107 nast\u0119puj\u0105cego kodu, aby uzyska\u0107 pierwszy wiersz dla ka\u017cdej dru\u017cyny:<\/span><\/p>\n
 #get first row for each team\n<\/span>df. groupby<\/span> (' team<\/span> '). nth<\/span> ( 0<\/span> )\n\n\tassist points\nteam\t\t\nAt 18 5\nB 19 14\nC 11 12<\/span><\/span><\/strong><\/pre>\n
 Mo\u017cemy r\u00f3wnie\u017c okre\u015bli\u0107 as_index=False,<\/strong> aby zachowa\u0107 oryginalne warto\u015bci indeksu:<\/span><\/p>\n
 #get first row for each team, keep original index values<\/span>\ndf. groupby<\/span> (' team<\/span> ', as_index= False<\/span> ). nth<\/span> ( 0<\/span> )\n<\/span>\n        team points assists\n0 to 18 5\n2 B 19 14\n5 C 11 12<\/span><\/span><\/strong><\/pre>\n
 Pami\u0119taj te\u017c, \u017ce mo\u017cesz przekaza\u0107 list\u0119 warto\u015bci do funkcji nth()<\/strong> , je\u015bli chcesz uzyska\u0107 pierwszych n wierszy ka\u017cdej grupy.<\/span><\/p>\n
 Na przyk\u0142ad poni\u017cszy kod pokazuje, jak uzyska\u0107 pierwsze dwa wiersze ka\u017cdej grupy:<\/span><\/p>\n
 #get first two rows for each team, keep original index values\n<\/span>df. groupby<\/span> (' team<\/span> ', as_index= False<\/span> ). nth<\/span> (( 0,1<\/span> )<\/span> )\n<\/span>\nteam points assists\n0 to 18 5\n1 To 22 19\n2 B 19 14\n3 B 14 8\n5 C 11 12\n6 C 20 13<\/span><\/span><\/strong><\/pre>\n
 Uwaga<\/strong> : pe\u0142n\u0105 dokumentacj\u0119 funkcji nth()<\/strong> znajdziesz tutaj<\/a> .<\/span><\/p>\n
 Dodatkowe zasoby<\/strong><\/span><\/h3>\n
 Poni\u017csze samouczki wyja\u015bniaj\u0105, jak wykonywa\u0107 inne typowe operacje na pandach:<\/span><\/p>\n
 Jak zdoby\u0107 pierwszy wiersz Pandas DataFrame<\/a>
 Jak usun\u0105\u0107 pierwszy wiersz w Pandas DataFrame<\/a>
 Jak wstawi\u0107 wiersz do ramki danych Pandas<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
Mo\u017cesz u\u017cy\u0107 nast\u0119puj\u0105cej podstawowej sk\u0142adni, aby uzyska\u0107 pierwszy wiersz ka\u017cdej grupy w ramce DataFrame pandy: df. groupby (’ column_name ’). nth ( 0 ) Poni\u017cszy przyk\u0142ad pokazuje, jak zastosowa\u0107 t\u0119 sk\u0142adni\u0119 w praktyce. Przyk\u0142ad: Zdob\u0105d\u017a pierwszy wiersz ka\u017cdej grupy w Pandach Za\u0142\u00f3\u017cmy, \u017ce mamy nast\u0119puj\u0105c\u0105 ramk\u0119 DataFrame pand: import pandas as pd #createDataFrame df = […]<\/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-2590","post","type-post","status-publish","format-standard","hentry","category-przewodnik"],"yoast_head":"\nPandy: Jak zdoby\u0107 pierwszy rz\u0105d ka\u017cdej grupy \u2013 Statorials<\/title>\n<meta name=\"description\" content=\"W tym samouczku wyja\u015bniono, jak uzyska\u0107 pierwszy wiersz ka\u017cdej grupy 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-w-pierwszym-rzedzie-kazdej-grupy\/\" \/>\n<meta property=\"og:locale\" content=\"pl_PL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pandy: Jak zdoby\u0107 pierwszy rz\u0105d ka\u017cdej grupy \u2013 Statorials\" \/>\n<meta property=\"og:description\" content=\"W tym samouczku wyja\u015bniono, jak uzyska\u0107 pierwszy wiersz ka\u017cdej grupy w ramce DataFrame pandy, podaj\u0105c kilka przyk\u0142ad\u00f3w.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pl\/pandy-w-pierwszym-rzedzie-kazdej-grupy\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-21T14:33:38+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-w-pierwszym-rzedzie-kazdej-grupy\/\",\"url\":\"https:\/\/statorials.org\/pl\/pandy-w-pierwszym-rzedzie-kazdej-grupy\/\",\"name\":\"Pandy: Jak zdoby\u0107 pierwszy rz\u0105d ka\u017cdej grupy \u2013 Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pl\/#website\"},\"datePublished\":\"2023-07-21T14:33:38+00:00\",\"dateModified\":\"2023-07-21T14:33:38+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pl\/#\/schema\/person\/6484727a4612df3e69f016c3129c6965\"},\"description\":\"W tym samouczku wyja\u015bniono, jak uzyska\u0107 pierwszy wiersz ka\u017cdej grupy w ramce DataFrame pandy, podaj\u0105c kilka przyk\u0142ad\u00f3w.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pl\/pandy-w-pierwszym-rzedzie-kazdej-grupy\/#breadcrumb\"},\"inLanguage\":\"pl-PL\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pl\/pandy-w-pierwszym-rzedzie-kazdej-grupy\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pl\/pandy-w-pierwszym-rzedzie-kazdej-grupy\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Dom\",\"item\":\"https:\/\/statorials.org\/pl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Pandy: jak zdoby\u0107 pierwszy rz\u0105d ka\u017cdej grupy\"}]},{\"@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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