Python List insert()
The Python List insert() method is an inbuilt function in Python that inserts a given element at a given index in a list.
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:
This method does not return any value but it inserts the given element at the given index.
Error:
If anything other than a list is used with insert(), then it returns an AttributeError.
Note:
If given index >= length(list) is given, then it inserts at the end of the list.
Example1: Inserting an Element to the List
# Python3 program for use # of insert() method list1 = [ 1, 2, 3, 4, 5, 6, 7 ] # insert 10 at 4th index list1.insert(4, 10) print(list1) list2 = ['a', 'b', 'c', 'd', 'e'] # insert z at the front of the listlist2.insert(0, 'z')print(list2) |
Output:
[1, 2, 3, 4, 10, 5, 6, 7] ['z', 'a', 'b', 'c', 'd', 'e']
Example 2: Error of insert() Method
- Python3
# Python3 program for error # of insert() method # 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
- 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 3beforeElement = 3 # Find indexindex = 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 to the List
- 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]
Last Updated on October 24, 2021 by admin