List Methods

Python provides list methods that allow us to work with lists.

Let’s learn few among them

• append()
• extend()
• insert()
• pop()
• clear()
• remove()
• sort()
• index()

Append

list.append(value)

Adds an element to the end of the list.

Code

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list_a = []

for x in range(1,4):

list_a.append(x)

print(list_a)

PYTHON

Output

[1, 2, 3]

Extend

list_a.extend(list_b)

Adds all the elements of a sequence to the end of the list.

Code

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list_a = [1, 2, 3]

list_b = [4, 5, 6]

list_a.extend(list_b)

print(list_a)

PYTHON

Output

[1, 2, 3, 4, 5, 6]

Insert

list.insert(index,value)

Element is inserted to the list at specified index.

Code

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list_a = [1, 2, 3]

list_a.insert(1,4)

print(list_a)

PYTHON

Output

[1, 4, 2, 3]

Pop

list.pop()

Removes last element.

Code

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list_a = [1, 2, 3]

list_a.pop()

print(list_a)

PYTHON

Output

[1, 2]

Remove

list.remove(value)

Removes the first matching element from the list.

Code

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list_a = [1, 3, 2, 3]

list_a.remove(3)

print(list_a)

PYTHON

Output

[1, 2, 3]

Clear

list.clear()

Removes all the items from the list.

Code

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list_a = [1, 2, 3]

list_a.clear()

print(list_a)

PYTHON

Output

[]

Index

list.index(value)

Returns the index at the first occurrence of the specified value.

Code

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list_a = [1, 3, 2, 3]

index =list_a.index(3)

print(index)

PYTHON

Output

1

Count

list.count(value)

Returns the number of elements with the specified value.

Code

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list_a = [1, 2, 3]

count = list_a.count(2)

print(count)

PYTHON

Output

1

Sort

list.sort()

Sorts the list.

Code

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list_a = [1, 3, 2]

list_a.sort()

print(list_a)

PYTHON

Output

[1, 2, 3]

Sort & Sorted

sort()

Modifies the list

Code

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list_a = [1, 3, 2]

list_a.sort()

print(list_a)

PYTHON

Output

[1, 2, 3]

sorted()

Creates a new sorted list

Code

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list_a = [1, 3, 2]

sorted(list_a)

print(list_a)

PYTHON

Output

[1, 3, 2]