Python Add Elements To An Array - AskPython

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Python doesn’t have a specific data type to represent arrays.

The following can be used to represent arrays in Python:

  • By using lists
  • By using the array module
  • By using the NumPy module

1. Adding to an array using Lists

If we are using List as an array, the following methods can be used to add elements to it:

  • By using append() function: It adds elements to the end of the array.
  • By using insert() function: It inserts the elements at the given index.
  • By using extend() function: It elongates the list by appending elements from both the lists.

Example 1: Adding elements to an array using append() function

my_input = ['Engineering', 'Medical'] my_input.append('Science') print(my_input)

Output:

['Engineering', 'Medical', 'Science']

Example 2: Adding elements to an array using extend() function

my_input = ['Engineering', 'Medical'] input1 = [40, 30, 20, 10] my_input.extend(input1) print(my_input)

Output:

['Engineering', 'Medical', 40, 30, 20, 10]

Example 3: Adding elements to an array using insert() function

my_input = [1, 2, 3, 4, 5] print(f'Current Numbers List {my_input}') number = int(input("Please enter a number to be added:\n")) index = int(input(f'Enter the index between 0 and {len(my_input) - 1} to add the given number:\n')) my_input.insert(index, number) print(f'Updated List {my_input}')

Output:

Output Insert Function
Output-Insert Function

2. Adding to an array using array module

If we are using the array module, the following methods can be used to add elements to it:

  • By using + operator: The resultant array is a combination of elements from both the arrays.
  • By using append() function: It adds elements to the end of the array.
  • By using insert() function: It inserts the elements at the given index.
  • By using extend() function: It elongates the list by appending elements from both the lists.

Example:

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)

Output:

Output Array Module
Output Array Module

3. Addition of elements to NumPy array

We can add elements to a NumPy array using the following methods:

  • By using append() function: It adds the elements to the end of the array.
  • By using insert() function: It adds elements at the given index in an array.

Example:

import numpy # insert function arr1_insert = numpy.array([1, 23, 33]) arr2_insert = numpy.insert(arr1_insert, 1, 91) print(arr2_insert) # append function arr1_append = numpy.array([4, 2, 1]) arr2_append = numpy.append (arr1_append, [12, 13, 14]) print(arr2_append)

Output:

[ 1 91 23 33][ 4 2 1 12 13 14]

Conclusion

Thus, in this article, we have implemented possible ways to add elements to an array.

References

  • Python add to an array
  • Python array Documentation
  • Python NumPy Documentation

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