{"id":28522,"date":"2025-08-31T16:30:23","date_gmt":"2025-08-31T13:30:23","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/python-quiz-closure-ve-dongu-degiskenleri\/"},"modified":"2025-08-31T16:30:23","modified_gmt":"2025-08-31T13:30:23","slug":"python-quiz-closure-ve-dongu-degiskenleri","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/python-quiz-closure-ve-dongu-degiskenleri\/","title":{"rendered":"Python Quiz: Closure ve D\u00f6ng\u00fc De\u011fi\u015fkenleri"},"content":{"rendered":"<p>Python Quiz: Closure ve D\u00f6ng\u00fc De\u011fi\u015fkenleri<\/p>\n<p>Python&#8217;da closure&#8217;lar ve d\u00f6ng\u00fc de\u011fi\u015fkenleri, genellikle yeni ba\u015flayanlar\u0131 \u015fa\u015f\u0131rtan ve kafa kar\u0131\u015f\u0131kl\u0131\u011f\u0131na yol a\u00e7an konulard\u0131r.  Bu makalede, bu iki kavram\u0131 ad\u0131m ad\u0131m, ger\u00e7ek d\u00fcnya \u00f6rnekleriyle ve farkl\u0131 deneyim seviyelerine uygun a\u00e7\u0131klamalarla inceleyece\u011fiz.  Closure&#8217;lar\u0131n nas\u0131l \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131, d\u00f6ng\u00fc de\u011fi\u015fkenlerindeki tuzaklar\u0131 ve bu sorunlar\u0131 nas\u0131l a\u015fabilece\u011finizi \u00f6\u011freneceksiniz.  Python&#8217;da fonksiyonel programlaman\u0131n inceliklerini kavrayarak kod kalitenizi ve performans\u0131n\u0131z\u0131 art\u0131rabileceksiniz.<\/p>\n<h2>Closure&#8217;lar Nedir ve Nas\u0131l \u00c7al\u0131\u015f\u0131rlar?<\/h2>\n<p>Closure, bir i\u00e7 fonksiyonun, d\u0131\u015f fonksiyonun kapsam\u0131ndaki de\u011fi\u015fkenlere eri\u015febildi\u011fi ve bunlar\u0131 &#8220;hat\u0131rlayabildi\u011fi&#8221; bir durumdur.  D\u00fc\u015f\u00fcn\u00fcn ki, i\u00e7 fonksiyon, d\u0131\u015f fonksiyonun kapsam\u0131n\u0131 bir \u015fekilde &#8220;kaps\u00fcllemi\u015f&#8221; ve d\u0131\u015far\u0131dan eri\u015fime kapatm\u0131\u015ft\u0131r. Bu &#8220;kaps\u00fclleme&#8221;, i\u00e7 fonksiyonun d\u0131\u015f fonksiyonun y\u00fcr\u00fct\u00fclmesinden sonra bile, d\u0131\u015f fonksiyonun de\u011fi\u015fkenlerine eri\u015fmesini sa\u011flar.  Bu, \u00f6zellikle fonksiyonel programlamada \u00e7ok g\u00fc\u00e7l\u00fc bir ara\u00e7t\u0131r ve veri gizleme, durum y\u00f6netimi gibi bir\u00e7ok avantaj sunar.<\/p>\n<p>\u00d6rne\u011fin, bir saya\u00e7 fonksiyonu olu\u015ftural\u0131m:<\/p>\n<pre><code class=\"language-python\">def counter():\n    count = 0\n    def increment():\n        nonlocal count  # count de\u011fi\u015fkenine d\u0131\u015f kapsamdan eri\u015fmek i\u00e7in &#039;nonlocal&#039; anahtar s\u00f6zc\u00fc\u011f\u00fc kullan\u0131l\u0131r.\n        count += 1\n        return count\n    return increment\n\nincrement_counter = counter()\nprint(increment_counter()) # \u00c7\u0131kt\u0131: 1\nprint(increment_counter()) # \u00c7\u0131kt\u0131: 2\nprint(increment_counter()) # \u00c7\u0131kt\u0131: 3<\/pre>\n<p><\/code><\/p>\n<p>Burada, <code>counter()<\/code> fonksiyonu <code>increment()<\/code> ad\u0131nda bir i\u00e7 fonksiyon tan\u0131mlar.  <code>increment()<\/code> fonksiyonu, <code>counter()<\/code> fonksiyonunun kapsam\u0131ndaki <code>count<\/code> de\u011fi\u015fkenine eri\u015fir ve de\u011fi\u015ftirir.  <code>counter()<\/code> fonksiyonunun d\u00f6nd\u00fcrd\u00fc\u011f\u00fc <code>increment_counter<\/code>,  <code>increment()<\/code> fonksiyonunun bir closure'\u0131d\u0131r.  <code>increment_counter()<\/code> fonksiyonu \u00e7a\u011fr\u0131ld\u0131\u011f\u0131nda, <code>count<\/code> de\u011fi\u015fkeninin \u00f6nceki de\u011ferini \"hat\u0131rlayarak\"  de\u011feri g\u00fcnceller ve yeni de\u011feri d\u00f6nd\u00fcr\u00fcr.  <code>nonlocal<\/code> anahtar kelimesi, i\u00e7 fonksiyonun global de\u011fi\u015fken yerine, bir \u00fcst kapsamdaki de\u011fi\u015fkeni hedeflemesini sa\u011flar.  Bu olmazsa, <code>count<\/code> de\u011fi\u015fkeni yerel bir de\u011fi\u015fken olarak de\u011ferlendirilir ve hata olu\u015furdu. Daha fazla bilgi i\u00e7in <a href=\"https:\/\/fatihsoysal.com\">Fatih Soysal'\u0131n web sitesini<\/a> ziyaret edebilirsiniz.<\/p>\n<h2>D\u00f6ng\u00fc De\u011fi\u015fkenleri ve Closure Tuza\u011f\u0131<\/h2>\n<p>Python'da d\u00f6ng\u00fcler i\u00e7inde closure'lar kullan\u0131rken dikkatli olmak gerekir.  Yeni ba\u015flayanlar s\u0131kl\u0131kla d\u00f6ng\u00fc de\u011fi\u015fkenlerinin beklendi\u011fi gibi \u00e7al\u0131\u015fmad\u0131\u011f\u0131n\u0131 fark ederler.  Bunun sebebi, Python'\u0131n d\u00f6ng\u00fc de\u011fi\u015fkenlerini tek bir de\u011fi\u015fken olarak ele almas\u0131d\u0131r. Bu durum, her bir yinelemede closure'\u0131n ayn\u0131 de\u011fi\u015fkene referans vermesine neden olur ve beklenmedik sonu\u00e7lar ortaya \u00e7\u0131kar. <\/p>\n<pre><code class=\"language-python\">functions = []\nfor i in range(3):\n    def create_closure(i):\n        def inner_function():\n            return i\n        return inner_function\n    functions.append(create_closure(i))\n\nfor f in functions:\n    print(f()) # \u00c7\u0131kt\u0131: 2, 2, 2 (Beklenen de\u011fil!)<\/pre>\n<p><\/code><\/p>\n<p>Yukar\u0131daki \u00f6rnekte, her <code>create_closure<\/code> fonksiyonu, d\u00f6ng\u00fcn\u00fcn son de\u011feri olan <code>2<\/code> yi \"hat\u0131rlar\".  Bu y\u00fczden her fonksiyon 2 d\u00f6nd\u00fcr\u00fcr.  Beklenen davran\u0131\u015f\u0131 elde etmek i\u00e7in, her yinelemede farkl\u0131 bir de\u011fi\u015fkene referans vermemiz gerekmektedir.  Bunun i\u00e7in lambda fonksiyonlar\u0131 veya <code>functools.partial<\/code> kullanabiliriz.<\/p>\n<h3>D\u00f6ng\u00fc De\u011fi\u015fkenleri Sorununu \u00c7\u00f6zmek: Lambda Fonksiyonlar\u0131<\/h3>\n<p>Lambda fonksiyonlar\u0131, bu sorunu \u00e7\u00f6zmek i\u00e7in olduk\u00e7a kullan\u0131\u015fl\u0131 bir y\u00f6ntem sa\u011flar.  Her bir yinelemede,  lambda fonksiyonu d\u00f6ng\u00fc de\u011fi\u015fkeninin anl\u0131k de\u011ferini \"yakalar\" (captures). <\/p>\n<pre><code class=\"language-python\">functions = []\nfor i in range(3):\n    functions.append(lambda j=i: j) # j=i  default parametresiyle anl\u0131k de\u011feri yakalar\u0131z.\n\nfor f in functions:\n    print(f())  # \u00c7\u0131kt\u0131: 0, 1, 2 (Beklenen davran\u0131\u015f)<\/pre>\n<p><\/code><\/p>\n<p>Bu \u00f6rnekte,  <code>lambda j=i: j<\/code> ifadesi,  <code>i<\/code> de\u011fi\u015fkeninin o anki de\u011ferini <code>j<\/code> de\u011fi\u015fkenine atar. B\u00f6ylece, her bir lambda fonksiyonu kendi \u00f6zel <code>j<\/code> de\u011fi\u015fkenine sahip olur ve d\u00f6ng\u00fcn\u00fcn son de\u011ferini de\u011fil, her bir yinelemenin de\u011ferini \"hat\u0131rlar\".<\/p>\n<h3>D\u00f6ng\u00fc De\u011fi\u015fkenleri Sorununu \u00c7\u00f6zmek: <code>functools.partial<\/code><\/h3>\n<p>Python'\u0131n <code>functools<\/code> mod\u00fcl\u00fcndeki <code>partial<\/code> fonksiyonu,  fonksiyonlar\u0131n parametrelerini \u00f6nceden atayarak yeni fonksiyonlar olu\u015fturmam\u0131z\u0131 sa\u011flar. Bu sayede d\u00f6ng\u00fc de\u011fi\u015fkeni sorununu da \u00e7\u00f6zebiliriz.<\/p>\n<pre><code class=\"language-python\">from functools import partial\n\nfunctions = []\nfor i in range(3):\n    functions.append(partial(lambda x: x, i))\n\nfor f in functions:\n    print(f())  # \u00c7\u0131kt\u0131: 0, 1, 2 (Beklenen davran\u0131\u015f)<\/pre>\n<p><\/code><\/p>\n<p>Burada <code>partial<\/code> fonksiyonu,  <code>lambda x: x<\/code> fonksiyonuna <code>i<\/code> de\u011ferini \u00f6nceden atar. Sonu\u00e7 olarak, her bir <code>partial<\/code> fonksiyonu kendi <code>i<\/code> de\u011ferini \"hat\u0131rlar\" ve bu de\u011feri d\u00f6nd\u00fcr\u00fcr.<\/p>\n<h2>Ger\u00e7ek D\u00fcnya Senaryolar\u0131<\/h2>\n<p>Closure'lar ve d\u00f6ng\u00fc de\u011fi\u015fkenlerinin anla\u015f\u0131lmas\u0131, bir\u00e7ok ger\u00e7ek d\u00fcnya senaryosunda kritik \u00f6neme sahiptir. \u00d6rne\u011fin,  bir web uygulamas\u0131nda, her kullan\u0131c\u0131 i\u00e7in ayr\u0131 bir oturum durumu (session) y\u00f6netmek i\u00e7in closure'lar kullanabilirsiniz.  Her kullan\u0131c\u0131 i\u00e7in ayr\u0131 bir closure olu\u015fturarak, kullan\u0131c\u0131 verilerini g\u00fcvenli bir \u015fekilde saklayabilir ve farkl\u0131 kullan\u0131c\u0131lar\u0131n verilerini birbirine kar\u0131\u015ft\u0131rmadan y\u00f6netebilirsiniz.<\/p>\n<p>Bir di\u011fer \u00f6rnek ise,  bir oyun geli\u015ftirme senaryosunda d\u00fc\u015fman karakterlerin her birine ait  yapay zeka (AI) davran\u0131\u015flar\u0131n\u0131 olu\u015fturmakt\u0131r. Her d\u00fc\u015fman i\u00e7in ayr\u0131 bir closure olu\u015fturabilir ve bu closure i\u00e7inde d\u00fc\u015fman\u0131n \u00f6zel durumunu ve davran\u0131\u015flar\u0131n\u0131 saklayabilirsiniz.  D\u00f6ng\u00fc de\u011fi\u015fkenleri sorunu ise, \u00f6zellikle grafiksel kullan\u0131c\u0131 aray\u00fczlerinde (GUI) dinamik nesne olu\u015ftururken ortaya \u00e7\u0131kabilir.  \u00d6rne\u011fin,  bir liste kutusu i\u00e7ine birden fazla buton eklemek istedi\u011finizde,  her butonun t\u0131klama olay\u0131n\u0131 do\u011fru bir \u015fekilde y\u00f6netmek i\u00e7in yukar\u0131da bahsedilen teknikleri kullanman\u0131z \u00f6nemlidir.<\/p>\n<h2>\u0130leri D\u00fczey Konular: Decorator'lar ve Closure'lar<\/h2>\n<p>Closure'lar, Python'daki decorator'lar\u0131n temelini olu\u015fturur.  Decorator'lar, fonksiyonlar\u0131n davran\u0131\u015f\u0131n\u0131 de\u011fi\u015ftirmek veya geli\u015ftirmek i\u00e7in kullan\u0131lan bir tasar\u0131m desenidir.  Bir decorator, temelde bir fonksiyonu parametre olarak alan ve bu fonksiyonu de\u011fi\u015ftirilmi\u015f bir \u015fekilde d\u00f6nd\u00fcren bir fonksiyondur.<\/p>\n<pre><code class=\"language-python\">def my_decorator(func):\n    def wrapper():\n        print(\"Fonksiyon \u00e7al\u0131\u015fmadan \u00f6nce...\")\n        func()\n        print(\"Fonksiyon \u00e7al\u0131\u015ft\u0131ktan sonra...\")\n    return wrapper\n\n@my_decorator\ndef say_hello():\n    print(\"Merhaba!\")\n\nsay_hello()<\/pre>\n<p><\/code><\/p>\n<p>Bu \u00f6rnekte, <code>my_decorator<\/code> fonksiyonu bir decorator'd\u0131r.  <code>@my_decorator<\/code> dekorat\u00f6r\u00fc, <code>say_hello<\/code> fonksiyonunu <code>my_decorator<\/code> fonksiyonuna aktar\u0131r ve <code>my_decorator<\/code> fonksiyonu, <code>say_hello<\/code> fonksiyonunu sarmalayan (<code>wrapper<\/code>) bir fonksiyon d\u00f6nd\u00fcr\u00fcr.  <code>wrapper<\/code> fonksiyonu, <code>say_hello<\/code> fonksiyonunu \u00e7al\u0131\u015ft\u0131rmadan \u00f6nce ve sonra ek i\u015flemler yapar.  Bu sarmalay\u0131c\u0131 fonksiyon bir closure'd\u0131r \u00e7\u00fcnk\u00fc <code>func<\/code> fonksiyonuna eri\u015febilir.  Daha karma\u015f\u0131k decorator'lar, closure'lar\u0131n g\u00fcc\u00fcnden daha fazla yararlanarak daha g\u00fc\u00e7l\u00fc fonksiyonel programlama yetenekleri sa\u011flar.<\/p>\n<h2>Performans Kar\u015f\u0131la\u015ft\u0131rmas\u0131: D\u00f6ng\u00fc De\u011fi\u015fkenleri \u00c7\u00f6z\u00fcmleri<\/h2>\n<p>| Y\u00f6ntem             | Performans | Okunabilirlik | Karma\u015f\u0131kl\u0131k |<br \/>\n|----------------------|------------|----------------|-------------|<br \/>\n| Standart D\u00f6ng\u00fc      | D\u00fc\u015f\u00fck      | Y\u00fcksek          | D\u00fc\u015f\u00fck       |<br \/>\n| Lambda Fonksiyonlar\u0131 | Orta       | Orta           | Orta        |<br \/>\n| <code>functools.partial<\/code> | Orta       | Orta           | Orta        |<\/p>\n<p>Performans a\u00e7\u0131s\u0131ndan, standart d\u00f6ng\u00fc y\u00f6ntemi en d\u00fc\u015f\u00fck performansa sahipken, lambda fonksiyonlar\u0131 ve <code>functools.partial<\/code> benzer performans g\u00f6sterir. Ancak, okunabilirlik ve karma\u015f\u0131kl\u0131k a\u00e7\u0131s\u0131ndan lambda fonksiyonlar\u0131 ve <code>functools.partial<\/code>, standart d\u00f6ng\u00fc y\u00f6nteminden daha iyi bir tercih olabilir, \u00f6zellikle de karma\u015f\u0131k senaryolar i\u00e7in. Do\u011fru y\u00f6ntemi se\u00e7erken, projenizin ihtiya\u00e7lar\u0131n\u0131 ve kodun okunabilirli\u011fini g\u00f6z \u00f6n\u00fcnde bulundurman\u0131z \u00f6nemlidir.<\/p>\n<h2>Sonu\u00e7<\/h2>\n<p>Bu makalede, Python'daki closure'lar ve d\u00f6ng\u00fc de\u011fi\u015fkenlerini ayr\u0131nt\u0131l\u0131 olarak inceledik.  Closure'lar\u0131n g\u00fcc\u00fcn\u00fc ve d\u00f6ng\u00fc de\u011fi\u015fkenlerindeki tuzaklar\u0131 anlamak, daha temiz, daha verimli ve daha okunabilir kod yazman\u0131za yard\u0131mc\u0131 olacakt\u0131r.  Lambda fonksiyonlar\u0131 ve <code>functools.partial<\/code> fonksiyonlar\u0131n\u0131n, d\u00f6ng\u00fc de\u011fi\u015fkenleri sorunlar\u0131n\u0131 \u00e7\u00f6zmek i\u00e7in kullan\u0131labilecek pratik y\u00f6ntemler oldu\u011funu g\u00f6rd\u00fck.  Bu bilgilerle, daha sa\u011flam ve g\u00fcvenilir Python uygulamalar\u0131 geli\u015ftirebilirsiniz.  Daha fazla bilgi i\u00e7in <a href=\"https:\/\/fatihsoysal.com\">Fatih Soysal'\u0131n web sitesini<\/a> ziyaret etmenizi tavsiye ederim.<\/p>\n<h3>S\u0131k\u00e7a Sorulan Sorular<\/h3>\n<ul>\n<li><strong>Closure'lar ne zaman kullan\u0131l\u0131r?<\/strong> Closure'lar, durum y\u00f6netimi, veri gizleme ve fonksiyonel programlama tekniklerinde kullan\u0131l\u0131r.<\/li>\n<li><strong>D\u00f6ng\u00fc de\u011fi\u015fkenleri sorununu \u00e7\u00f6zmek i\u00e7in ba\u015fka y\u00f6ntemler var m\u0131?<\/strong> Evet, <code>enumerate<\/code> fonksiyonu da kullan\u0131labilir.<\/li>\n<li><strong>Closure'lar performans\u0131 nas\u0131l etkiler?<\/strong> \u00c7ok fazla closure kullan\u0131m\u0131 performans\u0131 olumsuz etkileyebilir, ancak \u00e7o\u011fu uygulamada fark edilebilir bir etki yaratmaz.<\/li>\n<li><strong><code>nonlocal<\/code> anahtar kelimesi ne i\u015fe yarar?<\/strong> \u0130\u00e7 fonksiyonlar\u0131n \u00fcst kapsamdaki de\u011fi\u015fkenleri de\u011fi\u015ftirmesini sa\u011flar.<\/li>\n<li><strong>Decorator'lar closure'larla nas\u0131l ili\u015fkilidir?<\/strong> Decorator'lar, closure'lar\u0131 kullanarak fonksiyonlar\u0131n davran\u0131\u015flar\u0131n\u0131 de\u011fi\u015ftirir.<\/li>\n<\/ul>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"Python Quiz: Closure ve D\u00f6ng\u00fc De\u011fi\u015fkenleri Python&#8217;da closure&#8217;lar ve d\u00f6ng\u00fc de\u011fi\u015fkenleri, genellikle yeni ba\u015flayanlar\u0131 \u015fa\u015f\u0131rtan ve kafa kar\u0131\u015f\u0131kl\u0131\u011f\u0131na&hellip;","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-28522","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-genel","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.5 (Yoast SEO v25.3.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Python Quiz: Closure ve D\u00f6ng\u00fc De\u011fi\u015fkenleri<\/title>\n<meta name=\"description\" content=\"Python&#039;da closure&#039;lar ve d\u00f6ng\u00fc de\u011fi\u015fkenleri, genellikle yeni ba\u015flayanlar\u0131 \u015fa\u015f\u0131rtan ve kafa kar\u0131\u015f\u0131kl\u0131\u011f\u0131na yol a\u00e7an konulard\u0131r. Bu makalede, bu iki kavram\u0131 ad\u0131m ad\u0131m, ger\u00e7ek d\u00fcnya \u00f6rnekleriyle ve farkl\u0131 deneyim seviyelerine uygun a\u00e7\u0131klamalarla inceleyece\u011fiz. Closure&#039;lar\u0131n nas\u0131l \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131, d\u00f6ng\u00fc de\u011fi\u015fkenlerindeki tuzaklar\u0131 ve bu sorunlar\u0131 nas\u0131l a\u015fabilece\u011finizi \u00f6\u011freneceksiniz. Python&#039;da fonksiyonel programlaman\u0131n inceliklerini kavrayarak kod kalitenizi ve performans\u0131n\u0131z\u0131 art\u0131rabileceksiniz.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fatihsoysal.com\/blog\/python-quiz-closure-ve-dongu-degiskenleri\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python Quiz: Closure ve D\u00f6ng\u00fc De\u011fi\u015fkenleri\" \/>\n<meta property=\"og:description\" content=\"Python&#039;da closure&#039;lar ve d\u00f6ng\u00fc de\u011fi\u015fkenleri, genellikle yeni ba\u015flayanlar\u0131 \u015fa\u015f\u0131rtan ve kafa kar\u0131\u015f\u0131kl\u0131\u011f\u0131na yol a\u00e7an konulard\u0131r. Bu makalede, bu iki kavram\u0131 ad\u0131m ad\u0131m, ger\u00e7ek d\u00fcnya \u00f6rnekleriyle ve farkl\u0131 deneyim seviyelerine uygun a\u00e7\u0131klamalarla inceleyece\u011fiz. Closure&#039;lar\u0131n nas\u0131l \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131, d\u00f6ng\u00fc de\u011fi\u015fkenlerindeki tuzaklar\u0131 ve bu sorunlar\u0131 nas\u0131l a\u015fabilece\u011finizi \u00f6\u011freneceksiniz. 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