Array in Python with Examples

In this article we are going to perform array in python with examples, Creating Array in Python, Adding Elements to Array in Python, Updating Elements in Array in Python, Accessing Elements from Array in Python, Slicing of a Array in Python, Removing Elements from Array in Python.

Table of Contents

What is an Array in Python ?

An array is a collection of elements which can stored the elements in memory locations. Array can hold more than one value at a time. And array can hold the same type of items. Array makes easy to calculate the position of items.

#1: Creating Array in Python

To create an array, we need to import array module.

Example of creating array in python:

import array as arr

#creating an array integer type
a = arr.array('i', [1, 3, 5])
print(a)
#creating an array float type
b = arr.array('d', [1.1, 2.2, 3.3])
print(b)

Output:

array('i', [1, 3, 5])
array('d', [1.1, 2.2, 3.3])

Sr. No	Type Code	C Type	Python Type	Min Size in Bytes
1.	‘b’	signed char	int	1
2.	‘B’	unsigned char	int	1
3.	‘u’	Py_UNICODE	Unicode	2
4.	‘h’	signed short	int	2
5.	‘H’	unsigned short	int	2
6.	‘i’	signed int	int	2
7.	‘I’	unsigned int	int	2
8.	‘l’	signed long	int	4
9.	‘L’	Unsigned long	int	4
10.	‘f’	float	float	4
11.	‘d’	double	float	8

#2: Adding Elements to Array in Python

In python, we can add one elements to the Array by using built-in append() function.

And add one or more elements to the Array by using extend() function.

Example of Adding Elements to Array in Python:

import array as arr
a = arr.array('i', [6, 7, 8])
# using append() method
a.append(9)
print(a)     
# using extend() method
a.extend([3, 4, 5])
print(a)

Output:

array('i', [6, 7, 8, 9])
array('i', [6, 7, 8, 9, 3, 4, 5])

#3: Updating Elements in Array in Python

In Python, Arrays are mutable so we can update the elements in array.

Example of updating elements in Array in Python:

import array as arr
a = arr.array('i', [2, 4, 7, 8, 9, 10])
print(a)
a[0] = 3    
print(a)     
a[2:4] = arr.array('i', [5, 6])   
print(a)

Output:

array('i', [2, 4, 7, 8, 9, 10])
array('i', [3, 4, 7, 8, 9, 10])
array('i', [3, 4, 5, 6, 9, 10])

#4: Accessing Elements from Array in Python

In Python, we use index operator ([]) to access an item in a array.

Example of Accessing elements from array in Python:

import array as arr
a = arr.array('i', [1, 2, 3, 4, 5, 6, 7, 8])
print("Element is:", a[0])
print("Element is:", a[4])
print("Element is:", a[-3])

Output:

Element is: 1
Element is: 5
Element is: 6

#5: Slicing of a Array in Python

In Python, we can access a range of elements in an array by using the slicing operator (:).

Example of slicing of a array in python

import array as arr
a = [2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
b = arr.array('i', a)
print(b[4:7])  
print(b[2:])  
print(b[:])
print(b[:-3])

Output:

array('i', [10, 12, 14])
array('i', [6, 8, 10, 12, 14, 16, 18, 20])
array('i', [2, 4, 6, 8, 10, 12, 14, 16, 18, 20])
array('i', [2, 4, 6, 8, 10, 12, 14])

#6: Removing Elements from Array in Python

Using remove() method and

Using pop() method

In Python, Items can be removed from array by using built-in remove() function. Remove() method removes only one element at a time. Pop() method can also used to remove and return elements from array but by default it removes only last element of the array, if remove any specific element from the array, index of the element is passed as an argument to the pop() method.

Example of removing elements from array in python:

import array as arr
a = arr.array('i', [1, 2, 3, 4, 5])
# using remove() method 
a.remove(3)
print(a)
# using pop() method
a.pop(1)  
print(a)
# using pop() method by default remove last element
a.pop()  
print(a)

Output:

array('i', [1, 2, 4, 5])
array('i', [1, 4, 5])
array('i', [1, 4])

Conclusion:

we have covered array in python with examples, Creating Array in Python, Adding Elements to Array in Python, Updating Elements in Array in Python, Accessing Elements from Array in Python, Slicing of a Array in Python, Removing Elements from Array in Python.

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classed and objects in python with examples

Reference:

Python Official page