Python List insert()

Python List insert() method inserts a given element at a given index in a list using Python. 

Python List insert() Syntax

Syntax: list_name.insert(index, element)

Parameters:

• index: the index at which the element has to be inserted.
• element: the element to be inserted in the list.

Returns: Does not return any value.

Python List insert() Example

Python insert() methods with string in Python.

Python3

lis = ['Geeks', 'Geeks']
lis.insert(1, "For")
print(lis)

Output:

['Geeks', 'For', 'Geeks']

Example 1: Inserting an Element into the List

Here, we are inserting 10 at the 5th position(4th index) in a Python list.

Python3

list1 = [ 1, 2, 3, 4, 5, 6, 7 ]

# insert 10 at 4th index
list1.insert(4, 10)
print(list1)

Output:

[1, 2, 3, 4, 10, 5, 6, 7]

Example 2: Error of insert() Method

Here, we are inserting 1 at the 10th position in a Python list, we will get an error, If we try to insert anything in a string because the string doesn’t have attribute insert().

Python3

# attribute error
string = "1234567"

string.insert(10, 1)
print(string)

Output:

Traceback (most recent call last):
  File "/home/2fe54bd8723cd0ae89a17325da8b2eb5.py",
   line 7, in 
    string.insert(10, 1)
AttributeError: 'str' object has no attribute 'insert'

Example 3: Insertion in a List Before any Element

Here, we are inserting 13 at the 3rd position before 3 in a Python list.

Python3

# Python3 program for Insertion in a list
# before any element using insert() method

list1 = [ 1, 2, 3, 4, 5, 6 ]

# Element to be inserted
element = 13

# Element to be inserted before 3
beforeElement = 3

# Find index
index = list1.index(beforeElement)

# Insert element at beforeElement
list1.insert(index, element)
print(list1)

Output:

[1, 2, 13, 3, 4, 5, 6]

Example 4: Inserting a Tuple into the List

Here we are inserting a tuple in a list using the insert() function in Python.

Python3

list1 = [ 1, 2, 3, 4, 5, 6 ]

# tuple of numbers
num_tuple = (4, 5, 6)

# inserting a tuple to the list
list1.insert(2, num_tuple)

print(list1)

Output:

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