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

list_a = []
for x in range(1,4):
    list_a.append(x)
print(list_a)

Output

[1, 2, 3]

Extend

list_a.extend(list_b) Adds all the elements of a sequence to the end of the list.

Code

list_a = [1, 2, 3]
list_b = [4, 5, 6]
list_a.extend(list_b)
print(list_a)

Output

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

Insert

list.insert(index,value) Element is inserted to the list at specified index.

Code

list_a = [1, 2, 3]
list_a.insert(1,4)
print(list_a)

Output

[1, 4, 2, 3]

Pop

list.pop() Removes last element.

Code

list_a = [1, 2, 3]
list_a.pop()
print(list_a)

Output

[1, 2]

Remove

list.remove(value) Removes the first matching element from the list.

Code

list_a = [1, 3, 2, 3]
list_a.remove(3)
print(list_a)

Output

[1, 2, 3]

Clear

list.clear() Removes all the items from the list.

Code

list_a = [1, 2, 3]
list_a.clear()
print(list_a)

Output

[]

Index

list.index(value) Returns the index at the first occurrence of the specified value.

Code

list_a = [1, 3, 2, 3]
index =list_a.index(3)
print(index)

Output

1

Count

list.count(value) Returns the number of elements with the specified value.

Code

list_a = [1, 2, 3]
count = list_a.count(2)
print(count)

Output

1

Sort

list.sort() Sorts the list.

Code

list_a = [1, 3, 2]
list_a.sort()
print(list_a)

Output

[1, 2, 3]

Sort & Sorted

sort() Modifies the list

Code

list_a = [1, 3, 2]
list_a.sort()
print(list_a)

Output

[1, 2, 3]

sorted() Creates a new sorted list

Code

list_a = [1, 3, 2]
sorted(list_a)
print(list_a)

Output

[1, 3, 2]