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String Metotları #1 - Python Dersleri (Tutorials) by elektroyazilim

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palnet · @elektroyazilim ·
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String Metotları #1 - Python Dersleri (Tutorials)
![yeni.jpg](https://cdn.steemitimages.com/DQmVqEHkajCZyuMfc1Nn7AfRj9QwYTddNmLcySkpi48PD1S/yeni.jpg) 

Merhabalar

Python programlama derslerinin bu bölümünde _stringler_ ve onlarla alakalı metotlara başlayacağız.
 
En çok kullanılan string metotlarını tekere teker ele alacağız. Vereceğimiz metotların dışındaki diğer string metotları ve kullanımlarını aşağıdaki linkten öğrenebilirsiniz :

[string metotları](https://www.tutorialspoint.com/python/python_strings.htm)

## upper() ve lower() metotları

Stringler üzerinde en çok kullanılan metotlarından ikisidir. _upper()_  metodu, stringin tüm karakterlerini büyük harfe çevirirken; _lower()_ fonksiyonu stringin tüm karakterlerini küçük harfe çevirir.

Bu iki fonksiyonu direk string değişkenler üzerinde kullanabilirsiniz. Bunun için string değişken ismini yazdıktan sonra nokta operatörü ile fonksiyonları çağırabilirsiniz :

![](https://cdn.steemitimages.com/DQmZmzgt8FLQzdWAoEnxgQCZAbJYKD76mtdXM3bV1GsoNJc/image.png)

Bunun dışında bir stringi herhangi bir değişkene atamadan direk string üzerinde de aynı işlemleri uygulayabilirsiniz :

![](https://cdn.steemitimages.com/DQmXvcHhZwcB433nxTu5cZQ8LwNda4oWHZVCeSQc9ffNiVh/image.png)

Bu fonksiyonlar özellikle kullanıcı adı alırken ya da herhangi bir form bilgisini çekerken standardizasyonu sağlama için oldukça faydalıdır.

## replace() metodu

_replace()_ metodu normal herhangi bir text editöründe yaptığımız değiştirme işlemini yapmaktadır. İki parametre alır. Birinci parametre metin içerisinde ikincisi ile değiştirir.

Uygulamasını görelim :

![](https://cdn.steemitimages.com/DQmYk7mmDUneg3mijuJr929eNQmrCNwE4qG5jx1sfsUQt6c/image.png)

_Elektroyazılım_  kelimesindeki _"ı"_ harflerini _"i"_ harfi ile değiştirdi.

_replace()_ metodunu bunların dışında boşluk algılatmak için de kullanabilirsiniz. Mesela aşağıdaki örnekte boşluk karakterleri, "-" ile değiştirilmiştir.

![](https://cdn.steemitimages.com/DQme74hQDGCEobjqWJ1dvbm8vg9dEeeEZ91j6GdJKPaAV1f/image.png)

Bu metodu kullanarak şifre ya da kullanıcı isimlerindeki boşlukları kaldırabiliriz :

![](https://cdn.steemitimages.com/DQmRDtSuRDxz7QiEfa6SonekhZvKDgWg8H2nFQWjdfM54gZ/image.png)

Şimdilik bu kadar.

Umarım faydalı bir çalışma olmuştur.

Teşekkürler.

![yesilayrca.png](https://cdn.steemitimages.com/DQmYZw2bhUomeivJwQ8CiLaTzXTbJPLd1PsSGdcoEE1DfKP/yesilayrca.png)

Kaynak belirtilmeyen görseller bana aittir. The pictures without source in the post is belong to me

<hr><center><sub>Posted via <a href="https://www.marlians.com/">Marlians.com</a></sub></center>
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