>>> x = 42
>>> xs = [1, 2, 3]
>>> xs.insert(0, x)
>>> xs
[42, 1, 2, 3]
How it works:
list.insert(index, value)
Insert an item at a given position. The first argument is the index of the element before which to insert, so xs.insert(0, x) inserts at the front of the list, and xs.insert(len(xs), x) is equivalent to xs.append(x). Negative values are treated as being relative to the end of the list.
Top answer 1 of 10
1323
>>> x = 42
>>> xs = [1, 2, 3]
>>> xs.insert(0, x)
>>> xs
[42, 1, 2, 3]
How it works:
list.insert(index, value)
Insert an item at a given position. The first argument is the index of the element before which to insert, so xs.insert(0, x) inserts at the front of the list, and xs.insert(len(xs), x) is equivalent to xs.append(x). Negative values are treated as being relative to the end of the list.
2 of 10
612
>>> x = 42
>>> xs = [1, 2, 3]
>>> [x] + xs
[42, 1, 2, 3]
Note: don't use list as a variable name.
GeeksforGeeks
geeksforgeeks.org › python › python-perform-append-at-beginning-of-list
Perform Append at Beginning of List - Python - GeeksforGeeks
However, all the existing elements have to be shifted to accommodate the new one, which can make it less efficient for large lists. ... Explanation: insert(0, 6) method is used to add the value 6 at index 0, which places it at the beginning ...
Published July 11, 2025
Videos
00:59
Python short video | Insert elements in an array #shorts - YouTube
04:56
Adding 1 to each item in an Array (List) in Python. - YouTube
03:50
How to Insert an element at specific index in Array in Python | ...
L10- Adding elements in an array| On-Campus Placement | Python ...
03:47
How to add element at the beginning of a list in Python - example ...
DEV Community
dev.to › ra1nbow1 › 8-ways-to-add-an-element-to-the-beginning-of-a-list-and-string-in-python-925
8 ways to add an element to the beginning of a list and string in Python - DEV Community
June 3, 2022 - The insert() method takes two ... to insert an element at the beginning of the list , you need to specify 0, and not, as the first parameter 1....
GeeksforGeeks
geeksforgeeks.org › dsa › insert-element-at-the-beginning-of-an-array
Insert Element at the Beginning of an Array - GeeksforGeeks
November 7, 2024 - Time Complexity: O(n), where n is the size of the array. To insert an element at the beginning of an array, first shift all the elements of the array to the right by 1 index and after shifting insert the new element at 0th position.
Iditect
iditect.com › faq › python › python-numpy--how-to-insert-element-at-the-start-of-an-array.html
Python numpy - How to insert element at the start of an array
Alternatively, you can also use concatenation to add an element at the beginning of a NumPy array: import numpy as np # Create a NumPy array my_array = np.array([2, 3, 4, 5]) # Element to insert at the start element_to_insert = 1 # Insert the element at the start of the array using concatenation my_array = np.concatenate(([element_to_insert], my_array)) print(my_array) This code will produce the same result, inserting the element 1 at the beginning of the array. "Python numpy insert element at beginning example"
NumPy
numpy.org › doc › stable › reference › generated › numpy.insert.html
numpy.insert — NumPy v2.4 Manual
If axis is None, out is a flattened array. ... Append elements at the end of an array.
Note.nkmk.me
note.nkmk.me › home › python › numpy
NumPy: append() to add values to an array | note.nkmk.me
February 4, 2024 - In NumPy, the np.append() function allows you to add values (elements, rows, or columns) to either the end or the beginning of an array (ndarray).
DigitalOcean
digitalocean.com › community › tutorials › python-add-to-array
Python Array Add: How to Append, Extend & Insert Elements | DigitalOcean
April 15, 2025 - Learn how to add elements to an array in Python using append(), extend(), insert(), and NumPy functions. Compare performance and avoid common errors.
Programiz
programiz.com › python-programming › methods › list › insert
Python List insert()
# create a list of vowels vowel = ['a', 'e', 'i', 'u'] # 'o' is inserted at index 3 (4th position) vowel.insert(3, 'o') print('List:', vowel) # Output: List: ['a', 'e', 'i', 'o', 'u'] ... Here, elem is inserted to the list at the ith index. All the elements after elem are shifted to the right. ... If index is 0, the element is inserted at the beginning of the list.
Machinelearninghelp
machinelearninghelp.org › programming-for-machine-learning › how-to-add-element-to-beginning-of-array-python
Adding Elements to the Beginning of an Array in Python
Here, we use np.insert() to add a new element at the beginning of our NumPy array. This approach is generally more memory-efficient for large datasets. While not directly applicable in this context, understanding how arrays work under the hood can enhance your programming skills. In Python, lists (arrays) are implemented as dynamic arrays, which means they store elements in a contiguous block of memory.
Top answer 1 of 4
36
Another way to do that would be to use numpy.concatenate . Example -
np.concatenate([[88],a,[77]])
Demo -
In [62]: a = np.array([2, 56, 4, 8, 564])
In [64]: np.concatenate([[88],a,[77]])
Out[64]: array([ 88, 2, 56, 4, 8, 564, 77])
2 of 4
8
You can pass the list of indices to np.insert :
>>> np.insert(a,[0,5],[88,77])
array([ 88, 2, 56, 4, 8, 564, 77])
Or if you don't know the length of your array you can use array.size to specify the end of array :
>>> np.insert(a,[0,a.size],[88,77])
array([ 88, 2, 56, 4, 8, 564, 77])
AskPython
askpython.com › home › python add elements to an array
Python add elements to an Array - AskPython
January 16, 2024 - import array s1 = array.array('i', [1, 2, 3]) s2 = array.array('i', [4, 5, 6]) print(s1) print(s2) s3 = s1 + s2 print(s3) s1.append(4) print(s1) s1.insert(0, 10) print(s1) s1.extend(s2) print(s1) ... By using append() function: It adds the elements ...
Centron
centron.de › startseite › how to add elements to an array in python
How To Add Elements to an Array in Python – Step-by-Step Guide
December 6, 2024 - Learn how to add elements to an array in Python with array and NumPy modules. Simple examples for efficient array manipulation.
Index.dev
index.dev › blog › prepend-an-element-to-a-short-python-list
How to Prepend an Element to a Short Python List
The deque class from the collections module provides an appendleft() method that efficiently adds an element to the beginning of the deque. Converting the deque back to a list with list(my_deque) gives you a regular Python list.
Vultr Docs
docs.vultr.com › python › third-party › numpy › insert
Python Numpy insert() - Insert Elements | Vultr Docs
November 15, 2024 - Explore various examples that ... of your original data array. Import the NumPy library. Define an initial array. Use numpy.insert() to add an element at a desired index....
Delft Stack
delftstack.com › home › howto › python › python insert into list
How to Append to Front of a List in Python | Delft Stack
February 20, 2025 - Inserting an element at the beginning of a Python list is a common operation that can be efficiently accomplished using the list’s insert() method. This method inserts an element to the first index in the list, and by specifying the index ...
NumPy
numpy.org › doc › 2.1 › reference › generated › numpy.insert.html
numpy.insert — NumPy v2.1 Manual
A copy of arr with values inserted. Note that insert does not occur in-place: a new array is returned. If axis is None, out is a flattened array. ... Append elements at the end of an array.
W3Schools
w3schools.com › python › gloss_python_array_add.asp
Python Add Array Item
Python Examples Python Compiler Python Exercises Python Quiz Python Challenges Python Server Python Syllabus Python Study Plan Python Interview Q&A Python Bootcamp Python Certificate Python Training ... You can use the append() method to add an ...
PhoenixNAP
phoenixnap.com › home › kb › devops and development › add elements to python array
Add Elements to Python Array (3 Methods)
December 15, 2025 - The old list extends with the new elements, which all append to the end of the list. 4. Add an element to an exact location in a list with the insert() method. Provide the location index and the value to insert.
NumPy
numpy.org › doc › 2.2 › reference › generated › numpy.insert.html
numpy.insert — NumPy v2.2 Manual
If axis is None, out is a flattened array. ... Append elements at the end of an array.