Inserting an element at a particular place into a list is one of the essential operations when working with lists. Python’s insert() function makes it simple to carry out this action. An in-depth discussion of the insert() function’s syntax, parameters, applications, and examples will be provided in this article.
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.
List insert() in Python Example
Python List insert() method inserts a given element at a given index in a list using Python. Here is an example of Python insert() methods with string in Python.
Python3
list = ['Sun', 'rises', 'in', 'the', 'east']list.insert(0, "The")print(list) |
Output
['The', 'Sun', 'rises', 'in', 'the', 'east']
Inserting an Element to a specific index 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 indexlist1.insert(4, 10)print(list1) |
Output:
[1, 2, 3, 4, 10, 5, 6, 7]
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 errorstring = "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'
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() methodlist1 = [ 1, 2, 3, 4, 5, 6 ]# Element to be insertedelement = 13# Element to be inserted before 3beforeElement = 3# Find indexindex = list1.index(beforeElement)# Insert element at beforeElementlist1.insert(index, element)print(list1) |
Output:
[1, 2, 13, 3, 4, 5, 6]
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 numbersnum_tuple = (4, 5, 6)# inserting a tuple to the listlist1.insert(2, num_tuple)print(list1) |
Output:
[1, 2, (4, 5, 6), 3, 4, 5, 6]
Add an Element to the Beginning of a List
In this example, we are inserting the “orange” string at the 0 index of the fruits list.
Python3
fruits = ['apple', 'banana', 'cherry']fruits.insert(0, 'orange')print(fruits) # Output: ['orange', 'apple', 'banana', 'cherry'] |
Output :
['orange', 'apple', 'banana', 'cherry']
Inserting an Element at the end of the List
In this example, we are inserting the “cherry” at the end of the list.
Python3
fruits = ['apple', 'banana', 'cherry']fruits.insert(-1, 'orange')print(fruits)# Output: ['apple', 'banana', 'orange', 'cherry'] |
Output :
['apple', 'banana', 'orange', 'cherry']
Appending a dictionary to a list in Python
Here we are inserting a dictionary in a list using the insert() function in Python.
Python3
my_list = [{'name': 'Alice', 'age': 30}, {'name': 'Bob', 'age': 25}]new_dict = {'name': 'Charlie', 'age': 40}my_list.append(new_dict)print(my_list) |
Output :
[{'name': 'Alice', 'age': 30}, {'name': 'Bob', 'age': 25},
{'name': 'Charlie', 'age': 40}]
Python Insert List in Another List
Here we are inserting a list in a list using the insert() function in Python.
Python3
list1 = [1, 2, 3]list2 = [4, 5, 6]list1=list1+list2print(list1) |
Output :
[1, 2, 3, 4, 5, 6]
Append elements of a set to a list in Python
Here we are inserting a set in a list using the insert() function in Python.
Python3
list1 = [1, 2, 3]s= {4,5,6}list1.insert(3,s)print(list1) |
Output :
[1, 2, 3, {4, 5, 6}]
