{"id":10163,"date":"2026-10-29T10:40:00","date_gmt":"2026-10-29T07:40:00","guid":{"rendered":"https:\/\/www.yunuskaytan.com\/?p=10163"},"modified":"2026-10-29T10:40:00","modified_gmt":"2026-10-29T07:40:00","slug":"python-da-lambda-ve-list-comprehension","status":"publish","type":"post","link":"https:\/\/www.yunuskaytan.com\/en\/yk\/python-da-lambda-ve-list-comprehension\/","title":{"rendered":"Python&#8217;da Lambda ve List Comprehension"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Python ile geli\u015ftirme yaparken kodun yaln\u0131zca \u00e7al\u0131\u015fmas\u0131 de\u011fil, ayn\u0131 zamanda temiz, okunabilir ve Python standartlar\u0131na (Pythonic) uygun olmas\u0131 hedeflenir. Geleneksel d\u00f6ng\u00fcler ve standart fonksiyon tan\u0131mlamalar\u0131 baz\u0131 durumlarda kod bloklar\u0131n\u0131 gereksiz yere uzatabilir. Bu noktada devreye giren lambda ifadeleri ve liste \u00fcrete\u00e7leri, geli\u015ftiricilerin veri \u00fczerinde h\u0131zl\u0131 d\u00f6n\u00fc\u015f\u00fcmler yapmas\u0131n\u0131 sa\u011flar. Bu yaz\u0131da, tek sat\u0131rl\u0131k anonim fonksiyonlar\u0131 ve veri manip\u00fclasyonunda s\u0131kl\u0131kla ba\u015fvurulan python list comprehension yap\u0131s\u0131n\u0131 t\u00fcm detaylar\u0131yla inceleyece\u011fiz.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tek Sat\u0131rl\u0131k Anonim Fonksiyonlar: Lambda Nedir?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Python&#8217;da standart bir fonksiyon <code>def<\/code> anahtar kelimesiyle tan\u0131mlan\u0131r, bir isme sahip olur ve genellikle birden fazla sat\u0131rdan olu\u015fur. Ancak bazen bir fonksiyona yaln\u0131zca tek bir i\u015flem i\u00e7in, ge\u00e7ici olarak ihtiya\u00e7 duyulur. Bu gibi senaryolarda <code>lambda<\/code> anahtar kelimesi kullan\u0131larak isimsiz (anonim) fonksiyonlar olu\u015fturulur.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lambda fonksiyonlar\u0131 tek bir sat\u0131rda yaz\u0131l\u0131r, s\u0131n\u0131rs\u0131z say\u0131da parametre alabilir fakat yaln\u0131zca tek bir ifade (expression) i\u00e7erebilir. Bu ifade \u00e7al\u0131\u015ft\u0131r\u0131ld\u0131\u011f\u0131nda sonucu do\u011frudan geri d\u00f6nd\u00fcr\u00fcr.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Temel s\u00f6zdizimi \u015fu \u015fekildedir:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>lambda parametreler: ifade<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Basit bir toplama i\u015flemini lambda ile nas\u0131l ifade etti\u011fimize bakal\u0131m:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>topla = lambda x, y: x + y\nprint(topla(5, 7))<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Yukar\u0131daki \u00f6rnekte <code>topla<\/code> ad\u0131nda bir de\u011fi\u015fkene atanan lambda fonksiyonu iki parametre al\u0131r ve bunlar\u0131n toplam\u0131n\u0131 \u00fcretir. Konsola 12 \u00e7\u0131kt\u0131s\u0131 yazd\u0131r\u0131l\u0131r. Bununla birlikte, lambda fonksiyonlar\u0131n\u0131 de\u011fi\u015fkenlere atamak Python toplulu\u011funda \u00e7ok \u00f6nerilen bir y\u00f6ntem de\u011fildir; \u00e7\u00fcnk\u00fc bu durum standart bir <code>def<\/code> fonksiyonundan farks\u0131z hale gelir. Lambda as\u0131l g\u00fcc\u00fcn\u00fc ba\u015fka fonksiyonlar\u0131n i\u00e7ine parametre olarak verildi\u011finde g\u00f6sterir.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Lambda Fonksiyonlar\u0131n\u0131n Yerle\u015fik Ara\u00e7larla Kullan\u0131m\u0131<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Lambda ifadeleri \u00e7o\u011funlukla <code>map()<\/code>, <code>filter()<\/code> ve <code>sorted()<\/code> gibi \u00fcst d\u00fczey fonksiyonlarla birlikte kullan\u0131l\u0131r.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>map()<\/code>: Bir veri koleksiyonundaki her bir \u00f6\u011feye belirli bir i\u015flemi uygulamak i\u00e7in kullan\u0131l\u0131r.<\/li>\n\n<li><code>filter()<\/code>: Belirtilen ko\u015fulu sa\u011flayan (True d\u00f6nen) \u00f6\u011feleri se\u00e7erek yeni bir k\u00fcme olu\u015fturur.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u00d6rne\u011fin, bir say\u0131 listesindeki \u00e7ift say\u0131lar\u0131 filtrelemek i\u00e7in lambda \u015fu \u015fekilde kullan\u0131l\u0131r:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sayilar = [12, 17, 24, 35, 40, 51]\ncift_sayilar = list(filter(lambda sayi: sayi % 2 == 0, sayilar))\nprint(cift_sayilar)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu kod blo\u011funda <code>filter()<\/code> fonksiyonu, <code>sayilar<\/code> listesindeki her bir eleman\u0131 <code>sayi % 2 == 0<\/code> mant\u0131ksal s\u0131namas\u0131na tabi tutar. Yaln\u0131zca kalans\u0131z b\u00f6l\u00fcnen say\u0131lar se\u00e7ilir ve sonu\u00e7 <code>[12, 24, 40]<\/code> listesi olur.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Python List Comprehension Temelleri<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Geleneksel programlama dillerinde bir liste \u00fczerinde i\u015flem yap\u0131p yeni bir liste olu\u015fturmak i\u00e7in bo\u015f bir liste tan\u0131mlan\u0131r, <code>for<\/code> d\u00f6ng\u00fcs\u00fc ba\u015flat\u0131l\u0131r ve her ad\u0131mda <code>append()<\/code> metodu \u00e7a\u011fr\u0131l\u0131r. Python toplulu\u011fu bu s\u00fcreci daha zarif ve h\u0131zl\u0131 bir hale getirmek i\u00e7in python list comprehension y\u00f6ntemini geli\u015ftirmi\u015ftir.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">List comprehension, mevcut bir yinelenebilir (iterable) nesneden tek sat\u0131rda yeni bir liste t\u00fcretme y\u00f6ntemidir. S\u00f6zdizimi k\u00f6\u015feli parantezler i\u00e7erisine yaz\u0131l\u0131r:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>[ifade for eleman in yinelenebilir]<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Ayn\u0131 i\u015flemi geleneksel y\u00f6ntemle ve list comprehension ile kar\u015f\u0131la\u015ft\u0131ral\u0131m:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sayilar = [1, 2, 3, 4, 5]\n\nkareler_klasik = []\nfor sayi in sayilar:\n    kareler_klasik.append(sayi ** 2)\n\nkareler_modern = [sayi ** 2 for sayi in sayilar]<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130ki yakla\u015f\u0131m da <code>[1, 4, 9, 16, 25]<\/code> sonucunu verir. Ancak list comprehension y\u00f6ntemi <code>append()<\/code> metodunu s\u00fcrekli \u00e7a\u011f\u0131rmak yerine i\u015flemi do\u011frudan C seviyesinde optimize ederek \u00e7al\u0131\u015ft\u0131r\u0131r. Bu durum b\u00fcy\u00fck veri setlerinde belirgin bir performans avantaj\u0131 sa\u011flar.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ko\u015fullu \u0130fadelerle List Comprehension<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">List comprehension yap\u0131s\u0131na mant\u0131ksal ko\u015fullar ekleyerek veri filtreleme ve d\u00f6n\u00fc\u015ft\u00fcrme i\u015flemleri tek bir \u00e7at\u0131 alt\u0131nda birle\u015ftirilebilir.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">#### 1. Yaln\u0131zca Filtreleme (If Kullan\u0131m\u0131)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">E\u011fer sadece belirli \u015fartlar\u0131 sa\u011flayan elemanlar\u0131 yeni listeye almak istiyorsan\u0131z, ko\u015ful ifadesi d\u00f6ng\u00fcn\u00fcn en sa\u011f\u0131na eklenir:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sayilar = [5, 12, 19, 24, 31, 42]\non_uzeri_ciftler = [x for x in sayilar if x &gt; 10 and x % 2 == 0]\nprint(on_uzeri_ciftler)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu \u00f6rnekte liste \u00f6nce taran\u0131r, yaln\u0131zca 10&#8217;dan b\u00fcy\u00fck VE \u00e7ift olan de\u011ferler se\u00e7ilir. \u00c7\u0131kt\u0131 <code>[12, 24, 42]<\/code> olacakt\u0131r.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">#### 2. D\u00f6n\u00fc\u015ft\u00fcrme ve Alternatif De\u011fer (If-Else Kullan\u0131m\u0131)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">E\u011fer ko\u015fula uymayan elemanlar i\u00e7in farkl\u0131 bir de\u011fer \u00fcretilmek isteniyorsa, <code>if-else<\/code> yap\u0131s\u0131 <code>for<\/code> d\u00f6ng\u00fcs\u00fcn\u00fcn soluna, yani ifade k\u0131sm\u0131na yaz\u0131l\u0131r:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sinav_notlari = [45, 78, 92, 30, 55]\ndurumlar = [\"Gecti\" if not_ &gt;= 50 else \"Kaldi\" for not_ in sinav_notlari]\nprint(durumlar)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Burada her bir not kontrol edilir; 50 ve \u00fczeri i\u00e7in &#8220;Gecti&#8221;, aksi durumda &#8220;Kaldi&#8221; de\u011feri listeye yaz\u0131l\u0131r. \u00c7\u0131kt\u0131 <code>['Kaldi', 'Gecti', 'Gecti', 'Kaldi', 'Gecti']<\/code> olur.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Lambda ve List Comprehension Kar\u015f\u0131la\u015ft\u0131rmas\u0131<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Python d\u00fcnyas\u0131nda s\u0131k\u00e7a tart\u0131\u015f\u0131lan konulardan biri <code>map()<\/code> ve <code>lambda<\/code> kombinasyonunun mu, yoksa list comprehension yap\u0131s\u0131n\u0131n m\u0131 tercih edilmesi gerekti\u011fidir.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Okunabilirlik: \u00c7o\u011fu senaryoda python list comprehension s\u00f6zdizimi insan diline daha yak\u0131nd\u0131r ve Python toplulu\u011funda daha yayg\u0131n kabul g\u00f6r\u00fcr.<\/li>\n\n<li>Performans: K\u00fc\u00e7\u00fck ve orta \u00f6l\u00e7ekli veri setlerinde list comprehension genellikle <code>map() + lambda<\/code> ikilisine k\u0131yasla biraz daha h\u0131zl\u0131d\u0131r; \u00e7\u00fcnk\u00fc fazladan fonksiyon \u00e7a\u011fr\u0131s\u0131 maliyeti olu\u015fturmaz.<\/li>\n\n<li>Karma\u015f\u0131kl\u0131k: Lambda fonksiyonlar\u0131 karma\u015f\u0131kla\u015ft\u0131k\u00e7a kodun anla\u015f\u0131l\u0131rl\u0131\u011f\u0131 h\u0131zla d\u00fc\u015fer. E\u011fer birden fazla sat\u0131rl\u0131k mant\u0131k gerekiyorsa mutlaka <code>def<\/code> ile tan\u0131mlanm\u0131\u015f bir fonksiyon tercih edilmelidir.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A\u015fa\u011f\u0131daki iki sat\u0131r birebir ayn\u0131 \u00e7\u0131kt\u0131y\u0131 \u00fcretir, ancak ikinci kullan\u0131m \u00e7ok daha a\u00e7\u0131kt\u0131r:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>kelimeler = [\"python\", \"guvenlik\", \"yazilim\"]\n\nbuyuk_lambda = list(map(lambda k: k.upper(), kelimeler))\nbuyuk_comp = [k.upper() for k in kelimeler]<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">G\u00fcvenlik ve Sistem Y\u00f6netiminden Pratik Bir \u00d6rnek<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Bir sistem y\u00f6neticisi veya siber g\u00fcvenlik analisti olarak elinizde bir sunucunun a\u011f trafi\u011finden toplanm\u0131\u015f port numaralar\u0131 listesi oldu\u011funu varsayal\u0131m. Bu listedeki ge\u00e7ersiz portlar\u0131 eleyip standart web ve y\u00f6netim portlar\u0131n\u0131 (\u00f6rne\u011fin 22, 80, 443) ay\u0131klamak istiyorsunuz:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ham_portlar = [-1, 21, 22, 80, 443, 8080, 70000, 22, 80]\n\nkritik_portlar = {22, 80, 443}\n\nizlenen_portlar = [\n    port for port in set(ham_portlar) \n    if 1 &lt;= port &lt;= 65535 and port in kritik_portlar\n]\n\nprint(izlenen_portlar)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu \u00f6rnekte \u00f6nce <code>set()<\/code> ile kopyalar temizlenmi\u015f, ard\u0131ndan list comprehension i\u00e7inde hem port s\u0131n\u0131rlar\u0131 (1-65535) do\u011frulanm\u0131\u015f hem de sadece kritik olarak belirlenen portlar filtrelenmi\u015ftir. \u00c7\u0131kt\u0131 do\u011frudan <code>[80, 443, 22]<\/code> gibi temiz bir liste olacakt\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sonu\u00e7 ve Sonraki Ad\u0131mlar<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Lambda ifadeleri ve list comprehension yap\u0131lar\u0131, Python&#8217;da veri d\u00f6n\u00fc\u015ft\u00fcrme ad\u0131mlar\u0131n\u0131 sadele\u015ftirmenin en temel iki yoludur. Lambda anonim ve anl\u0131k i\u015flemler i\u00e7in ideal bir se\u00e7enek sunarken, python list comprehension yap\u0131s\u0131 veri filtreleme ve haritalama s\u00fcre\u00e7lerinde kodun okunabilirli\u011fini \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131r\u0131r.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bu iki tekni\u011fi kavrad\u0131ktan sonraki ad\u0131m olarak s\u00f6zl\u00fck \u00fcrete\u00e7lerini (dictionary comprehension), k\u00fcme \u00fcrete\u00e7lerini (set comprehension) ve b\u00fcy\u00fck veri k\u00fcmelerinde bellek tasarrufu sa\u011flayan \u00fcrete\u00e7 ifadelerini (generator expressions) inceleyerek Python yetkinli\u011finizi bir \u00fcst seviyeye ta\u015f\u0131yabilirsiniz.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Python&#8217;da daha temiz, k\u0131sa ve okunabilir kodlar yazmak i\u00e7in kullan\u0131lan lambda ifadelerini ve list comprehension yap\u0131s\u0131n\u0131 pratik \u00f6rneklerle \u00f6\u011frenin.<\/p>","protected":false},"author":1,"featured_media":10164,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[207],"tags":[320,319,215,298,266],"class_list":["post-10163","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python","tag-lambda-fonksiyonu","tag-list-comprehension","tag-python","tag-python-temelleri","tag-yazilim-gelistirme"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Python&#039;da Lambda ve List Comprehension - Yunus KAYTAN<\/title>\n<meta name=\"description\" content=\"Python list comprehension ve lambda fonksiyonlar\u0131n\u0131n mant\u0131\u011f\u0131n\u0131, farklar\u0131n\u0131 ve pratik kod \u00f6rneklerini bu rehberde ayr\u0131nt\u0131lar\u0131yla ke\u015ffedin.\" \/>\n<meta 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