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In this tutorial, we will learn about the Python List insert() method with the help of examples.
Nội dung chính
- Syntax of List insert()
- insert() Parameters
- Return Value from insert()
- Example 1: Inserting an Element to the List
- Example 2: Inserting a Tuple (as an Element) to the List
- Python List insert() Syntax
- Python List insert() Example
- Example 1: Inserting an Element into the List
- Example 2: Error of insert() Method
- Example 3: Insertion in a List Before any Element
- Example 4: Inserting a Tuple into the List
- What is use of insert () method in list?
- What does the insert function do?
- What is the difference between Insert () and append () method in Python?
- What is insert () and append () function give examples?
The insert() method inserts an element to the list the specified index.
Example
# create a list of vowels
vowel = [‘a’, ‘e’, ‘i’, ‘u’]
# ‘o’ is inserted index 3 (4th position)
vowel.insert(3, ‘o’)
print(‘List:’, vowel)
# Output: List: [‘a’, ‘e’, ‘i’, ‘o’, ‘u’]
Syntax of List insert()
The syntax of the insert() method is
list.insert(i, elem)
Here, elem is inserted to the list the ith index.
All the elements after elem are shifted to the right.
insert() Parameters
The insert() method takes two parameters:
- index – the index where the element needs to be inserted
- element – this is the element to be inserted in the list
Notes:
- If index is 0, the element is inserted the beginning of the list.
- If index is 3, the index of the inserted
element will be 3 (4th element in the list).
Return Value from insert()
The insert() method doesn’t return anything; returns None. It only updates the current list.
Example 1: Inserting an Element to the List
# create a list of prime numbers
prime_numbers = [2, 3, 5, 7]
# insert 11 index 4
prime_numbers.insert(4, 11)
print(‘List:’, prime_numbers)
Output
List: [2, 3, 5, 7, 11]
Example 2: Inserting a Tuple (as an Element) to the List
mixed_list = [1, 2, [5, 6, 7]]
# number tuple
number_tuple = (3, 4)
# inserting a tuple to the list
mixed_list.insert(1, number_tuple)
print(‘Updated List:’, mixed_list)
Output
Updated List: [1, 2, (3, 4), [5, 6, 7]]
Python List insert() method inserts a given element a given index in a list using Python.
Python List insert() Syntax
Syntax: list_name.insert(index, element)
Parameters:
- index: the index 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 the 5th position(4th index) in a Python list.
Python3
list1 = [ 1, 2, 3, 4, 5, 6, 7 ]
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 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
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 the 3rd position before 3 in a Python list.
Python3
list1 = [ 1, 2, 3, 4, 5, 6 ]
element = 13
beforeElement = 3
index = list1.index(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 ]
num_tuple = (4, 5, 6)
list1.insert(2, num_tuple)
print(list1)
Output:
[1, 2, (4, 5, 6), 3, 4, 5, 6]
What is use of insert () method in list?
The insert() method inserts an element to the list the specified index.
What does the insert function do?
The INSERT( ) function inserts specified characters or spaces into a character string, beginning a specified position in the string.
What is the difference between Insert () and append () method in Python?
The only difference between append() and insert() is that insert function allows us to add a specific element a specified index of the list unlike append() where we can add the element only end of the list.
What is insert () and append () function give examples?
Difference between Append, Extend and Insert.
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