How to declare an array in python

An array is a linear data structure that stores values of the same data type. To use arrays in python language, you need to import the standard array module.

The array is not a fundamental data type like strings, integers, etc. so we need to import the array module in python.

Arrays

#Syntax for import array

from array import *

Once you have imported the array module, you can declare an array.

#Syntax for declaring array

arrayName = array(typecode, [Initializers])

• array_name –> name of array
• typecode –> the type of array
• Initializers –> values

Example

#Example for an array

from array import *
my_array = array('i', [1,2,3,4,5])
for i in my_array:
    print(i)

#Output
1
2
3
4
5

Here is a simple example of an array containing 5 integers.

The main difference between arrays and lists

In python, lists can contain values corresponding to different data types but arrays in python can only contain values corresponding to same data type

append values

The append() function is used to adds a value at the end of an array.

#append value 6 at the end of an array

from array import *
my_array = array('i', [1,2,3,4,5])
my_array.append(6)
print(my_array)

#Output
array('i', [1, 2, 3, 4, 5, 6])

insert values

The insert() function inserts a value at the specified index in an array.

#append value 6 at the end of an array

from array import *
my_array = array('i', [1,2,3,4,5])
my_array.insert(0,0)
print(my_array)

#Output
array('i', [0,1, 2, 3, 4, 5])

extend values

extend() is used to adds the elements in a list to the end of another list. That is concatenated (+ or +=) both lists.

#extend an array

from array import *
my_array = array('i', [1,2,3,4,5])
my_array1 = array('i', [6,7,8,9,10])
my_array.extend(my_array1)
print(my_array)

#Output
array('i', [1, 2, 3, 4, 5, 6, 7, 8, 9, 10])

Add items using fromlist() method

Add items from list into array using fromlist() method

#extend an array

from array import *
my_array = array('i', [1,2,3,4,5])
array = [6,7,8]
my_array.fromlist(array)
print(my_array)

#Output
array('i', [1, 2, 3, 4, 5, 6, 7, 8])

Read also

10 Python shortcuts you need to know: https://cybrblog.tech/10-python-shortcuts-you-need-to-know/

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