List Methods ใน Python: คู่มือครบครั้งพร้อมตัวอย่าง

Python List มี Built-in Methods มากมายที่ช่วยจัดการข้อมูลได้สะดวก บทความนี้รวบรวมทุกเมธอดพร้อมตัวอย่างโค้ดและผลลัพธ์

Methods ที่แก้ไขลิสต์ต้นฉบับ (In-place)

append(x)

>> lst = ['Hello', 'Python']
>>> lst.append('Tutorialspoint')
>>> lst
['Hello', 'Python', 'Tutorialspoint']

clear()

>> lst.clear()
>>> lst
[]

copy()

>> lst = ['Hello', 'Python', 'Tutorialspoint']
>>> lst1 = lst.copy()
>>> lst1.append('Java')
>>> lst
['Hello', 'Python', 'Tutorialspoint']
>>> lst1
['Hello', 'Python', 'Tutorialspoint', 'Java']

extend(iterable)

>> lst = ['Hello', 'Python']
>>> lst.extend(['Java', 'CSharp'])
>>> lst
['Hello', 'Python', 'Java', 'CSharp']

insert(i, x)

>> lst = ['Hello', 'Python', 'Tutorialspoint']
>>> lst.insert(0, 'CPlusPlus')
>>> lst
['CPlusPlus', 'Hello', 'Python', 'Tutorialspoint']

pop([i])

>> lst = ['CPlusPlus', 'Hello', 'Python', 'Java', 'Tutorialspoint', 'Python']
>>> lst.pop()
'Python'
>>> lst.pop(3)
'Java'

remove(x)

>> lst.remove('Python')
>>> lst
['CPlusPlus', 'Hello', 'Java', 'Tutorialspoint', 'Python']

reverse()

>> lst.reverse()
>>> lst
['Python', 'Tutorialspoint', 'Java', 'Python', 'Hello', 'CPlusPlus']

sort(key=None, reverse=False)

>> lst = [2, 3, 7, 1, 13, 8, 49]
>>> lst.sort()
>>> lst
[1, 2, 3, 7, 8, 13, 49]
>>> lst.sort(reverse=True)
>>> lst
[49, 13, 8, 7, 3, 2, 1]

Methods ที่ไม่แก้ไขลิสต์ (Read-only)

count(x)

>> lst = ['Hello', 'Python', 'Tutorialspoint', 'Python']
>>> lst.count('Python')
2

index(x[, start[, end]])

>> lst.index('Python')
1
>>> lst.index('Python', 2)
3

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