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Gelişmiş Veri İşleme (Python)
Vebende Akademi · 2026-06-21 · via DEV Community

Gelişmiş Veri İşleme (Python)

Sıralama, Filtreleme ve Arama – Profesyonel Veri Manipülasyonu Rehberi

Python’da veri işleme, sadece döngülerden ibaret değildir. Modern Python yaklaşımı; fonksiyonel programlama araçları, yüksek seviyeli built-in fonksiyonlar ve lambda ifadeleri ile daha kısa, daha okunabilir ve daha performanslı çözümler üretmeyi hedefler.

Bu bölümde dört kritik alanı derinlemesine inceleyeceğiz:

  • sorted() ile gelişmiş sıralama
  • lambda ile karmaşık veri yapıları üzerinde sıralama
  • filter() ve map() ile fonksiyonel veri dönüşümü
  • any() ve all() ile toplu doğrulama (validation)

Her bölümde gerçek dünya senaryoları ve hands-on örnekler olacak.


1. sorted() Fonksiyonu — Gelişmiş Sıralama Motoru

1.1 Temel Yapı

sorted(iterable, key=None, reverse=False)

Parametreler:

  • iterable: Liste, tuple, set vb.
  • key: Sıralama kriteri (fonksiyon)
  • reverse: True → büyükten küçüğe

1.2 Basit Sıralama

```python id="s1"
sayilar = [5, 1, 9, 3, 7]

sonuc = sorted(sayilar)

print(sonuc)




---

## 1.3 Ters Sıralama



```python id="s2"
sayilar = [5, 1, 9, 3, 7]

print(sorted(sayilar, reverse=True))


1.4 Tuple Sıralama

```python id="s3"
veri = (10, 5, 20, 15)

print(sorted(veri))




---

## 1.5 String Sıralama (ASCII mantığı)



```python id="s4"
kelimeler = ["python", "ai", "data", "backend"]

print(sorted(kelimeler))


2. key Parametresi — Sıralamanın Beyni

sorted() fonksiyonunun gerçek gücü burada başlar.


2.1 String Uzunluğuna Göre Sıralama

```python id="k1"
kelimeler = ["python", "ai", "veri", "makineöğrenmesi"]

sonuc = sorted(kelimeler, key=len)

print(sonuc)




---

## 2.2 Sayıların Moduna Göre Sıralama



```python id="k2"
sayilar = [10, 3, 7, 21, 14, 9]

sonuc = sorted(sayilar, key=lambda x: x % 5)

print(sonuc)


2.3 Tuple Sıralama (Gerçek Dünya)

```python id="k3"
urunler = [
("Laptop", 45000),
("Mouse", 500),
("Monitör", 12000)
]

sonuc = sorted(urunler, key=lambda x: x[1])

print(sonuc)




---

## 2.4 Çok Katmanlı Sıralama

Fiyat → sonra isim



```python id="k4"
urunler = [
    ("Laptop", 45000),
    ("Mouse", 500),
    ("Monitör", 12000),
    ("Laptop Pro", 45000)
]

sonuc = sorted(
    urunler,
    key=lambda x: (x[1], x[0])
)

print(sonuc)


2.5 Dictionary Sıralama

```python id="k5"
urunler = {
"Laptop": 45000,
"Mouse": 500,
"Monitör": 12000
}

sonuc = sorted(
urunler.items(),
key=lambda x: x[1]
)

print(sonuc)




---

# 3. Lambda ile Karmaşık Sıralama

Lambda = isimsiz fonksiyon

---

## 3.1 Temel Lambda



```python id="l1"
f = lambda x: x * 2

print(f(5))


3.2 Sıralamada Lambda Kullanımı

```python id="l2"
ogrenciler = [
{"ad": "Ali", "not": 80},
{"ad": "Ayşe", "not": 95},
{"ad": "Mehmet", "not": 70}
]

print(sorted(ogrenciler, key=lambda x: x["not"]))




---

## 3.3 En Yüksek Not



```python id="l3"
print(sorted(ogrenciler, key=lambda x: x["not"], reverse=True))


3.4 Çok Alanlı Sıralama

```python id="l4"
data = [
{"ad": "Ali", "not": 80, "yas": 22},
{"ad": "Ayşe", "not": 80, "yas": 20},
{"ad": "Mehmet", "not": 70, "yas": 25}
]

sonuc = sorted(
data,
key=lambda x: (-x["not"], x["yas"])
)

print(sonuc)




---

# 4. filter() — Veri Filtreleme Motoru

## 4.1 Temel Yapı



```python
filter(function, iterable)


4.2 Çift Sayıları Filtreleme

```python id="f1"
sayilar = [1, 2, 3, 4, 5, 6]

ciftler = list(filter(lambda x: x % 2 == 0, sayilar))

print(ciftler)




---

## 4.3 Boş Değer Temizleme



```python id="f2"
veri = ["Ali", "", "Ayşe", None, "Mehmet"]

temiz = list(filter(None, veri))

print(temiz)


4.4 10’dan Büyük Sayılar

```python id="f3"
sayilar = [5, 10, 15, 3, 20]

sonuc = list(filter(lambda x: x > 10, sayilar))

print(sonuc)




---

## 4.5 Dictionary Filter



```python id="f4"
urunler = [
    {"ad": "Laptop", "stok": 10},
    {"ad": "Mouse", "stok": 0},
    {"ad": "Monitör", "stok": 5}
]

sonuc = list(
    filter(lambda x: x["stok"] > 0, urunler)
)

print(sonuc)


5. map() — Veri Dönüştürme Motoru

5.1 Temel Yapı

map(function, iterable)


5.2 Sayıları 2 ile Çarpma

```python id="m1"
sayilar = [1, 2, 3, 4]

sonuc = list(map(lambda x: x * 2, sayilar))

print(sonuc)




---

## 5.3 String Uppercase



```python id="m2"
isimler = ["ali", "ayşe", "mehmet"]

sonuc = list(map(str.upper, isimler))

print(sonuc)


5.4 Float → Int Dönüşüm

```python id="m3"
sayilar = [1.2, 3.7, 5.9]

sonuc = list(map(int, sayilar))

print(sonuc)




---

## 5.5 Dictionary Transform



```python id="m4"
urunler = [
    {"ad": "Laptop", "fiyat": 1000},
    {"ad": "Mouse", "fiyat": 50}
]

sonuc = list(
    map(lambda x: x["fiyat"] * 1.2, urunler)
)

print(sonuc)


5.6 map + lambda vs comprehension

```python id="m5"

map

list(map(lambda x: x * 2, range(5)))

comprehension (tercih edilir)

[x * 2 for x in range(5)]




---

# 6. any() — En Az Bir True Var mı?

## 6.1 Temel Kullanım



```python id="a1"
sayilar = [0, 0, 1, 0]

print(any(sayilar))


6.2 Şart Kontrolü

```python id="a2"
sayilar = [2, 4, 6, 7]

print(any(x % 2 == 1 for x in sayilar))




---

## 6.3 Kullanıcı Kontrolü



```python id="a3"
kullanicilar = [
    {"aktif": False},
    {"aktif": False},
    {"aktif": True}
]

print(any(u["aktif"] for u in kullanicilar))


7. all() — Hepsi True mu?

7.1 Temel Kullanım

```python id="al1"
sayilar = [1, 2, 3, 4]

print(all(sayilar))




---

## 7.2 Tüm Sayılar Pozitif mi?



```python id="al2"
sayilar = [1, 2, 3, -1]

print(all(x > 0 for x in sayilar))


7.3 Validation Sistemi

```python id="al3"
form = {
"email": "test@mail.com",
"password": "12345",
"username": "admin"
}

print(all(form.values()))




---

# 8. any() vs all() Karşılaştırma

| Fonksiyon | Anlam        |
| --------- | ------------ |
| any()     | en az 1 True |
| all()     | hepsi True   |

---

# 9. Gerçek Hayat Hands-On Projeler

---

## 9.1 Log Analizi Sistemi



```python id="r1"
loglar = [
    {"level": "INFO"},
    {"level": "ERROR"},
    {"level": "INFO"}
]

errors = list(
    filter(lambda x: x["level"] == "ERROR", loglar)
)

print(errors)


9.2 En Pahalı Ürün

```python id="r2"
urunler = [
("A", 100),
("B", 500),
("C", 300)
]

en_pahali = max(urunler, key=lambda x: x[1])

print(en_pahali)




---

## 9.3 Geçerli Kullanıcı Kontrolü



```python id="r3"
kullanicilar = [
    {"ad": "Ali", "aktif": True},
    {"ad": "Ayşe", "aktif": False}
]

print(any(u["aktif"] for u in kullanicilar))
print(all(u["aktif"] for u in kullanicilar))


9.4 Veri Pipeline

```python id="r4"
data = [10, 15, 20, 25, 30]

sonuc = list(
map(
lambda x: x * 2,
filter(lambda x: x > 15, data)
)
)

print(sonuc)




---

# 10. Performans Perspektifi

* comprehension > map/filter (çoğu durumda)
* sorted() C implementasyonu ile çok hızlıdır
* any/all short-circuit çalışır (erken durur)

---

# 11. Python ve C# Karşılaştırma

## sorted()



```python
sorted(data, key=lambda x: x["not"])

data.OrderBy(x => x.Not);


filter()

list(filter(lambda x: x > 10, data))

data.Where(x => x > 10);


map()

list(map(lambda x: x * 2, data))

data.Select(x => x * 2);


12. Özet

Bu makalede öğrendiklerin:

sorted()

  • Gelişmiş sıralama
  • key parametresi
  • lambda ile multi-sort

filter()

  • veri eleme
  • koşullu filtreleme

map()

  • veri dönüşümü

any / all

  • toplu doğrulama

Sonuç

Bu fonksiyonlar Python’un fonksiyonel programlama çekirdeğini oluşturur.

Modern backend, AI pipeline, data engineering sistemlerinde:

  • sorted → ranking
  • filter → cleaning
  • map → transformation
  • any/all → validation

olarak kritik rol oynar.