Python Arrays | Array in Python

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In Python, an array is a data structure that can hold multiple values or elements of the same data type in a single variable. It’s a collection of items of homogeneous data types.

An array is a collection of items stored at contiguous memory locations. Arrays are used to store multiple values in one single variable. An array is a special variable, which can hold more than one value at a time.

Unlike lists, which can hold items of different data types, arrays in Python are typically used to store items of the same data type. This makes them more efficient for numerical computations. Python does not have a built-in array data type, but the ‘array’ module provides an array type that can be used for this purpose.

All elements of the array in Python must be of the same type. Array in Python can be created by importing an array module. array(data_type , value_list ) is used to create array in Python with data type and value list specified in its arguments.

Examples of Array:

Example-1

import array
vals=array.array(‘i’,[1,2,-3,4,5])
print(vals[0])

Output:

1

Example-2

import array
vals=array.array(‘i’,[1,2,-3,4,5])
print(vals.buffer_info())

Output:

(2244425783600, 5)

Example-3:

import array as arr
vals=arr.array(‘i’,[1,2,-3,4,5])
print(vals.typecode)

Output:

i

Reversing Elements in an Array

In order to reverse elements of an array we need to simply use reverse method. The reverse() method reverses the order of the elements.

from array import *
vals=array(‘i’,[1,2,-3,4,5])
vals.reverse()
print(vals)

Output:

array(‘i’, [5, 4, -3, 2, 1])

from array import *
vals=array(‘i’,[1,2,-3,4,5])
vals.reverse()
print(vals[0])

Output:

5

Looping Array Elements

We can use the loop to loop through all the elements of an array.


from array import *
vals=array(‘i’,[1,2,-3,4,5])
for i in range(5):
    print(vals[i],end=’ ‘)

Output:

1 2 -3 4 5

from array import *
vals=array(‘i’,[1,2,-3,4,5])
for i in vals:
    print(i,end=’ ‘)

Output:

1 2 -3 4 5


from array import *
vals=array(‘u’,[‘a’,’e’,’i’,’o’,’u’])
for i in vals:
    print(i,end=’ ‘)

Output:

a e i o u

from array import *
vals=array(‘i’,[1,2,3,4,5])
newArr=array(vals.typecode,(a*a for a in vals))
for i in newArr:
    print(i, end=’ ‘)

Output:

1 4 9 16 25

from array import *
vals=array(‘i’,[1,2,3,4,5])
newArr=array(vals.typecode,(a*a for a in vals))
i=0
while i<len(newArr):
    print(newArr[i], end=’ ‘)
    i+=1

Output:

1 4 9 16 25


from array import *
vals=array(‘i’,[10,20,30,40,50,60])
print(“Elements of the given array: “);
for i in vals:
    print(i, end=’ ‘)

Output:

Elements of the given array:

10 20 30 40 50 60

Length of an Array

Use the len() method to return the length of an array (the number of elements in an array).

from array import *
vals=array(‘i’,[1,2,-3,4,5])
for i in range(len(vals)):
    print(vals[i],end=’ ‘)

Output:

1 2 -3 4 5

FAQ:

What are Python Arrays?

Python Arrays are a data structure that can hold a collection of items. Unlike lists, which can hold items of different data types, arrays in Python are typically used to store items of the same data type. This makes them more efficient for numerical computations. Python does not have a built-in array data type, but the ‘array’ module provides an array type that can be used for this purpose.

How do you create an Array in Python?

To create an array in Python, we can use the ‘array’ module. First, we need to import the module, and then we can create an array by specifying the type code and the initial values.

For example:

import array

arr = array.array(‘i’, [1, 2, 3, 4,5])

Here, ‘i’ indicates integers. This creates an array of integers with the values 1, 2, 3, 4 and 5.

What is the difference between Lists and Arrays in Python?

The main difference between lists and arrays in Python is that lists can hold items of different data types, while arrays are designed to hold items of the same data type. Arrays are more memory efficient and provide better performance for numerical operations. However, lists are more flexible and easier to use for general-purpose programming.

How do you access elements in a Python Array?

We can access elements in a Python array using index, similar to how we would access elements in a list. The index starts at 0 for the first element.

For example:

import array arr = array.array(‘i’, [1, 2, 3, 4,5])

vals = arr[3]   # Accessing the third element

print(vals)   # Output: 4

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