{"id":1403,"date":"2024-12-04T10:07:49","date_gmt":"2024-12-04T07:07:49","guid":{"rendered":"https:\/\/sefedu.com.tr\/index.php\/2024\/12\/04\/python-degiskenler\/"},"modified":"2024-12-04T10:07:49","modified_gmt":"2024-12-04T07:07:49","slug":"python-degiskenler","status":"publish","type":"post","link":"https:\/\/sefedu.com.tr\/index.php\/2024\/12\/04\/python-degiskenler\/","title":{"rendered":"Python De\u011fi\u015fkenleri Hakk\u0131nda Her \u015eey 2024 [Detayl\u0131 Rehber]"},"content":{"rendered":"

Python De\u011fi\u015fkenler: Temel Bilgiler ve Kullan\u0131m Rehberi<\/p>\n

Python programlama dilinde de\u011fi\u015fkenler<\/strong>, verileri saklaman\u0131n ve y\u00f6netmenin temel yap\u0131 ta\u015flar\u0131d\u0131r. Bu yaz\u0131da, de\u011fi\u015fkenlerin ne oldu\u011funu, nas\u0131l olu\u015fturuldu\u011funu ve Python’daki b\u00fcy\u00fck \u00f6nemini ele alaca\u011f\u0131z. Ayr\u0131ca, de\u011fi\u015fkenlerle ilgili baz\u0131 ilgin\u00e7 bilgileri de payla\u015farak, bili\u015fim d\u00fcnyas\u0131nda de\u011fi\u015fkenlerin rol\u00fcn\u00fc e\u011flenceli bir \u015fekilde anlatmaya \u00e7al\u0131\u015faca\u011f\u0131z. <\/p>\n

\u0130lginizi \u00c7ekebilir: ‘Python Final Sorular\u0131 2024 [G\u00fcncel Liste]’<\/a><\/p>\n

python de\u011fi\u015fkenler<\/p>\n

Python De\u011fi\u015fken Nedir?<\/p>\n

Bir de\u011fi\u015fken, bir de\u011feri veya nesneyi saklamak i\u00e7in kullan\u0131lan isimlendirilmi\u015f bir alan olarak tan\u0131mlanabilir. Python\u2019da de\u011fi\u015fkenleri tan\u0131mlamak olduk\u00e7a basittir. Sadece bir isim belirleriz ve ard\u0131ndan bu isme bir de\u011fer atar\u0131z. \u00d6rnek vermek gerekirse:<\/p>\n

“`python
\nsayim = 10
\n“`
\nBu durumda, `sayim` isimli bir de\u011fi\u015fken tan\u0131mlanm\u0131\u015f ve bu de\u011fi\u015fkene `10` de\u011feri atanm\u0131\u015ft\u0131r. Burada dikkat edilmesi gereken, de\u011fi\u015fken isminin yaz\u0131m kurallar\u0131na uygun olmas\u0131d\u0131r.<\/p>\n

De\u011fi\u015fken \u0130simlendirme Kurallar\u0131<\/p>\n

Python\u2019da de\u011fi\u015fken isimlendirme kurallar\u0131, programlar\u0131n okunabilirli\u011fi i\u00e7in \u00e7ok \u00f6nemlidir. \u0130lk olarak, de\u011fi\u015fken isimleri harf ile ba\u015flamal\u0131d\u0131r. Ayr\u0131ca, \u00f6zel karakterler veya bo\u015fluk i\u00e7ermemelidir. \u00d6rne\u011fin, `de\u011fi\u015fkenim` veya `de\u011fi\u015fken_1` ge\u00e7erli de\u011fi\u015fken isimleridir. Ancak `de\u011fi\u015fken-1` ya da `1de\u011fi\u015fken` ge\u00e7ersizdir.<\/p>\n

Ge\u00e7i\u015f kelimeleri kullanarak bu kurallara dikkat etmek, kod yazarken etkili bir yakla\u015f\u0131md\u0131r. Kullan\u0131c\u0131lar i\u00e7in belirgin ve anlaml\u0131 de\u011fi\u015fken isimleri se\u00e7mek, program\u0131n bak\u0131m\u0131n\u0131 ve geli\u015ftirilmesini kolayla\u015ft\u0131r\u0131r.<\/p>\n

Python\u2019da De\u011fi\u015fken T\u00fcrleri<\/p>\n

Python\u2019da bir de\u011fi\u015fkenin ne t\u00fcrde veri saklayaca\u011f\u0131n\u0131 belirlemek \u00f6nemlidir. Python\u2019da temel de\u011fi\u015fken t\u00fcrleri \u015funlard\u0131r:<\/p>\n

– int: Tam say\u0131lard\u0131r (\u00f6rne\u011fin, -10, 0, 25)
\n– float: Ondal\u0131k say\u0131lard\u0131r (\u00f6rne\u011fin, 3.14, -0.5)
\n– str: Metin verileridir (\u00f6rne\u011fin, “Merhaba”, “Python”)
\n– bool: Mant\u0131ksal de\u011ferlerdir (\u00f6rne\u011fin, True veya False)<\/p>\n

Bu t\u00fcrleri do\u011fru \u015fekilde kullanmak, hata yapma olas\u0131l\u0131\u011f\u0131n\u0131 azalt\u0131r. \u00d6rne\u011fin, say\u0131 ile metin ya da mant\u0131ksal de\u011ferleri kar\u0131\u015ft\u0131rmak hatalara yol a\u00e7abilir.<\/p>\n

De\u011fi\u015fkenleri Tan\u0131mlamak ve Atamak<\/p>\n

Python, bir de\u011fi\u015fkeni tan\u0131mlamak ve ona de\u011fer atamak i\u00e7in `=` operat\u00f6r\u00fcn\u00fc kullan\u0131r. K\u0131sacas\u0131, de\u011fi\u015fken tan\u0131mlamak i\u00e7in a\u015fa\u011f\u0131daki gibi bir yap\u0131 izlenir:<\/p>\n

“`python
\na = 5
\nb = “Hello, Python!”
\n“`
\nBurada `a` isimli bir de\u011fi\u015fken `5` de\u011ferini, `b` isimli ba\u015fka bir de\u011fi\u015fken ise `”Hello, Python!”` de\u011ferini saklar. \u00d6nemli olan, de\u011fi\u015fkenlerinizi anlaml\u0131 bir \u015fekilde tan\u0131mlamakt\u0131r. <\/p>\n

De\u011fi\u015fkenlerin Kullan\u0131m\u0131nda Dikkat Edilmesi Gerekenler<\/p>\n

Bir de\u011fi\u015fkenle i\u015flem yaparken, de\u011fi\u015fken t\u00fcrlerinin uyumuna dikkat etmek \u00f6nemlidir. \u00d6rne\u011fin, bir say\u0131 ile bir metni toplarsan\u0131z, Python bir hata verir. \u0130\u015fte burada dikkatli olmak ve de\u011fi\u015fken t\u00fcrlerini bilmek gerek.<\/p>\n

Ek olarak, baz\u0131 Python \u00f6zellikleri sayesinde de\u011fi\u015fkenlerinizi daha etkili bir \u015fekilde y\u00f6netebilirsiniz. \u00d6rne\u011fin, bir de\u011fi\u015fkenin de\u011ferini de\u011fi\u015ftirmek olduk\u00e7a basittir. Sadece yeni bir de\u011fer atayarak eski de\u011feri g\u00fcncelleyebilirsiniz:<\/p>\n

“`python
\na = 10
\na = a + 5 <\/p>\n

\u015eimdi a’n\u0131n de\u011feri 15
\n“`<\/p>\n

Kapsam ve Lokal De\u011fi\u015fkenler<\/p>\n

Python\u2019da bir de\u011fi\u015fkenin kapsam\u0131 (scope) \u00f6nemlidir. Lokal de\u011fi\u015fkenler, tan\u0131mland\u0131klar\u0131 blok i\u00e7inde ge\u00e7erlidir. Fakat global de\u011fi\u015fkenler, program\u0131n genelinde eri\u015filebilir. \u00d6rne\u011fin:<\/p>\n

“`python
\ndef fonk():
\n lokal_degisken = 20
\n print(lokal_degisken)<\/p>\n

fonk()
\nprint(lokal_degisken) <\/p>\n

Hata d\u00f6nd\u00fcrecek, \u00e7\u00fcnk\u00fc lokal de\u011fi\u015fken d\u0131\u015far\u0131da ge\u00e7erli de\u011fil
\n“`<\/p>\n

Buradan hareketle, de\u011fi\u015fkenlerinizi kullan\u0131rken dikkatli olmal\u0131s\u0131n\u0131z. Nelere dikkat etmeniz gerekti\u011fini hat\u0131rlamak, yaz\u0131l\u0131m projelerinizde gereksiz hatalar\u0131 \u00f6nler.<\/p>\n

Immutable (De\u011fi\u015ftirilemez) ve Mutable (De\u011fi\u015ftirilebilir) De\u011fi\u015fkenler<\/p>\n

Python\u2019da de\u011fi\u015fkenler immutable ve mutable olmak \u00fczere ikiye ayr\u0131l\u0131r. Immutable de\u011fi\u015fkenler, bir kez olu\u015fturulduktan sonra de\u011fi\u015ftirilemezler. Bu t\u00fcr de\u011fi\u015fkenler aras\u0131nda `int`, `float`, ve `str` bulunmaktad\u0131r. \u00d6rne\u011fin, bir string de\u011fi\u015fkenini de\u011fi\u015ftirmek istedi\u011finizde, yeni bir string olu\u015fturman\u0131z gerekir:<\/p>\n

“`python<\/p>\n

Immutable bir string
\nmetin = “Python”
\nmetin = metin + ” programlama dili”
\n“`<\/p>\n

\u0130lginizi \u00c7ekebilir: ‘Python Vize Sorular\u0131 2024 [G\u00fcncel Liste]’<\/a><\/p>\n

python de\u011fi\u015fkenler<\/p>\n

Di\u011fer yandan, mutable de\u011fi\u015fkenler de\u011fi\u015ftirilebilir. \u00d6rnek vermek gerekirse, listeler ve s\u00f6zl\u00fckler mutable de\u011fi\u015fkenlerdir. Yani, de\u011fi\u015fkenin i\u00e7eri\u011fini do\u011frudan de\u011fi\u015ftirebilirsiniz:<\/p>\n

“`python<\/p>\n

Mutable bir liste
\nliste = [1, 2, 3]
\nliste.append(4) <\/p>\n

Bu i\u015flem listeyi de\u011fi\u015ftirecek
\n“`<\/p>\n

Python\u2019da De\u011fi\u015fken Atama: Kopyalama ve Referans<\/p>\n

De\u011fi\u015fken atamas\u0131n\u0131n en ilgin\u00e7 yanlar\u0131ndan biri, Python’da referans atamas\u0131 yap\u0131lmas\u0131d\u0131r. Bir listeyi bir de\u011fi\u015fkene atad\u0131\u011f\u0131n\u0131zda, asl\u0131nda listeyi kopyalamak yerine onun referans\u0131n\u0131 tutuyorsunuz. Bu durumda, bir de\u011fi\u015fiklik yapt\u0131\u011f\u0131n\u0131zda, di\u011fer de\u011fi\u015fken de etkilenecektir:<\/p>\n

“`python
\nliste1 = [1, 2, 3]
\nliste2 = liste1 <\/p>\n

Listeyi kopyalamak yerine referans\u0131n\u0131 al\u0131yoruz
\nliste2.append(4)<\/p>\n

print(liste1) <\/p>\n

[1, 2, 3, 4] – liste1 de de\u011fi\u015fti
\n“`<\/p>\n

Python’da De\u011fi\u015fkenlerin \u00d6mr\u00fc<\/p>\n

De\u011fi\u015fkenlerin \u00f6mr\u00fc, tan\u0131mland\u0131klar\u0131 kapsam ile ba\u011flant\u0131l\u0131d\u0131r. Lokal de\u011fi\u015fkenler, tan\u0131mland\u0131klar\u0131 i\u015flev itibar\u0131yla yarat\u0131l\u0131r ve i\u015flev sona erdi\u011finde yok edilir. \u00d6rne\u011fin:<\/p>\n

“`python
\ndef deneme():
\n x = 5
\n return x<\/p>\n

print(deneme()) <\/p>\n

5<\/p>\n

print(x) <\/p>\n

Hata d\u00f6nd\u00fcrecek, \u00e7\u00fcnk\u00fc x yok
\n“`<\/p>\n

Burada, `deneme` fonksiyonu tamamlan\u0131nca, `x` de\u011fi\u015fkeninin \u00f6mr\u00fc sona erer.<\/p>\n

De\u011fi\u015fkenlerin Kullan\u0131m Avantajlar\u0131<\/p>\n

Python\u2019da de\u011fi\u015fken kullanman\u0131n bir\u00e7ok avantaj\u0131 vard\u0131r. \u0130lk olarak, kodunuzu daha d\u00fczenli ve okunabilir hale getirir. Ayr\u0131ca, de\u011fi\u015fkenler sayesinde kodun di\u011fer b\u00f6l\u00fcmlerinde tekrar tekrar ayn\u0131 veriyi kullanman\u0131za gerek yoktur. Bu, yaz\u0131lacak kod miktar\u0131n\u0131 azalt\u0131r ve hata yapma olas\u0131l\u0131\u011f\u0131n\u0131 en aza indirir.<\/p>\n

De\u011fi\u015fkenler ayr\u0131ca, belirli bir de\u011feri veya durumu temsil etti\u011finden, kodun anla\u015f\u0131labilirli\u011fini art\u0131r\u0131r. Bu suretle, hem programc\u0131lar hem de kodu inceleyecek olan di\u011fer kullan\u0131c\u0131lar, kodun i\u015fleyi\u015fini daha h\u0131zl\u0131 kavrayabilir.<\/p>\n

Python De\u011fi\u015fken Belirtileri<\/p>\n

Python’da de\u011fi\u015fkenleri kullan\u0131rken belirli notasyonlar\u0131 ve belirtileri de \u00f6\u011frenmek, uzmanla\u015fman\u0131z\u0131 sa\u011flar. De\u011fi\u015fkenleri tan\u0131mlarken bir belirtme yap\u0131s\u0131 kullanmak \u00f6zellikle yararl\u0131d\u0131r. \u00d6rne\u011fin, tip belirlemesi yaparak kodunuzun ne t\u00fcr verilerle \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 a\u00e7\u0131k\u00e7a ifade edebilirsiniz.<\/p>\n

“`python
\nx: int = 10 <\/p>\n

x de\u011fi\u015fkeninin bir tamsay\u0131 oldu\u011funu belirtiyoruz
\ny: str = “Merhaba” <\/p>\n

y de\u011fi\u015fkeninin bir string oldu\u011funu belirtiyoruz
\n“`
\nBu yaz\u0131m ile hem kodu okuyan ki\u015finin hem de kodu geli\u015ftiren ki\u015finin, verinin t\u00fcr\u00fc hakk\u0131nda daha net bir fikri olur.<\/p>\n

Python’da Kullan\u0131lan Pop\u00fcler De\u011fi\u015fken Tipleri<\/p>\n

Python’da \u00e7ok\u00e7a kullan\u0131lan ve bilinen baz\u0131 de\u011fi\u015fken tipleri aras\u0131nda `list`, `tuple`, ve `dict` bulunmaktad\u0131r. Bu yap\u0131lar\u0131n her biri, belirli ama\u00e7lar i\u00e7in \u00f6zelle\u015fmi\u015ftir. \u00d6rne\u011fin, bir liste dinamik olarak b\u00fcy\u00fcyebilirken, tuple yap\u0131s\u0131 bir kez olu\u015fturulduktan sonra de\u011fi\u015ftirilemez.<\/p>\n

Kullan\u0131c\u0131lar, ihtiya\u00e7lar\u0131na g\u00f6re uygun de\u011fi\u015fken tipini se\u00e7erek programlar\u0131n\u0131 daha etkili bir \u015fekilde yazabilirler. Bunun yaninda, farkl\u0131 de\u011fi\u015fken tipleri aras\u0131ndaki farklar\u0131 bilmek, yaz\u0131l\u0131m projelerinde esneklik sa\u011flar.<\/p>\n

Sonu\u00e7<\/p>\n

Sonu\u00e7 olarak, Python\u2019daki de\u011fi\u015fkenler, programlama becerilerinizi geli\u015ftirmek ve daha yetkin bir kod yazmak i\u00e7in temel bir ara\u00e7t\u0131r. De\u011fi\u015fkenlerin do\u011fru kullan\u0131m\u0131, yaz\u0131l\u0131m projelerinde hatalar\u0131 azalt\u0131r ve kodun okunabilirli\u011fini art\u0131r\u0131r. De\u011fi\u015fkenleri anlamak ve etkili bir \u015fekilde y\u00f6netmek, programc\u0131lar i\u00e7in \u00f6nemli bir beceridir.<\/p>\n

Unutulmamas\u0131 gereken en \u00f6nemli nokta, her de\u011fi\u015fkenin bir amaca hizmet etti\u011fidir. De\u011fi\u015fkenlerinizi dikkatli se\u00e7in ve y\u00f6netin. Her i\u015finizde ba\u015far\u0131n\u0131n temelinin do\u011fru de\u011fi\u015fken kullan\u0131m\u0131nda yatt\u0131\u011f\u0131n\u0131 unutmay\u0131n!<\/p>\n

\u0130lginizi \u00c7ekebilir: ‘Python ile Kullan\u0131c\u0131dan Veri Alma Y\u00f6ntemleri 2024 [G\u00fcncel Rehber]’<\/a>
\npython de\u011fi\u015fkenler<\/p>\n

Herhangi bir sorunuz varsa veya daha fazla bilgi almak isterseniz, Python belgeleri ve topluluk forumlar\u0131 olduk\u00e7a faydal\u0131 kaynaklard\u0131r. Daha fazla \u00f6\u011frenme ve ke\u015ffetme i\u00e7in ilgili kaynaklara g\u00f6z atabilirsiniz:<\/p>\n

– Issue 13678: way to prevent accidental variable overriding<\/a>
\n– PEP 526 \u2013 Syntax for Variable Annotations<\/a>
\n– Issue 21161: list comprehensions don’t see local variables in pdb<\/a>
\n– Why doesn’t Python have static variables?<\/a>
\n– contextvars \u2014 Context Variables \u2014 Python 3.13.0 documentation<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Python’da de\u011fi\u015fkenler hakk\u0131nda \u00f6\u011frenin! Temel bilgileri, kullan\u0131m y\u00f6ntemlerini ve \u00f6rneklerini ke\u015ffedin. Programlamaya ad\u0131m at\u0131n!<\/p>\n","protected":false},"author":1,"featured_media":1400,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-1403","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"yoast_head":"\nPython De\u011fi\u015fkenleri Hakk\u0131nda Her \u015eey 2024 [Detayl\u0131 Rehber] - SEF Education<\/title>\n<meta name=\"description\" content=\"Python'da de\u011fi\u015fkenler hakk\u0131nda \u00f6\u011frenin! Temel bilgileri, kullan\u0131m y\u00f6ntemlerini ve \u00f6rneklerini ke\u015ffedin. 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