Python - Array append() Method

Python Arrayappend() method is used to add an element to the existing array. It accepts the desired element as a parameter and adds it at the end of the current array.

In general, an array is a collection of similar datatypes. Unlike in other technologies we cannot create an array by default. The Pythonarray module provides a set of methods to create and manipulate arrays.

Syntax

Following is the syntax of the Python Arrayappend() method −

array_name.append(element)

Parameters

This method accepts the element that has to be appended.

Return Value

This method does not return any value.

Example 1

The following is the basic example of the Python Arrayappend() method −

import array as arrmy_array = arr.array('i',[1, 2, 3, 4])#Appending a new elementnew_element = 100my_array.append(new_element)print("Array Elements After Append : ", my_array)

Output

The new_element is added at the end of my_array. Here is the output −

Array Elements After Append :  array('i', [1, 2, 3, 4, 100])

Example 2

If the datatype of the element we are trying to append is different from the datatype of the array we will get aTypeError.

In the following example we have created an array ofint data type, when we try to append a floating point value (5.6) to it, we will get an error −

import array as arrmy_array = arr.array('i',[1,2,3,4])#Appending a new elementnew_element = 5.6my_array.append(new_element)print("Array Elements After Append : ", my_array)

Output

Traceback (most recent call last):  File "E:\pgms\arr.py", line 15, in <module>    my_array.append(new_element)TypeError: 'float' object cannot be interpreted as an integer

Example 3

Lets try another example. Here we have createddouble float data type array. We try to append double float96.6 to my_array1.

import array as arr#Creating an array my_array1 = arr.array('d',[22.5,26.7,35.6,4.5])#Printing the elements of an arrayprint("Array Elements Before Appending : ", my_array1)element=96.9my_array1.append(element)print("Array Elements After Appending: ",my_array1)

Output

Array Elements Before Appending :  array('d', [22.5, 26.7, 35.6, 4.5])Array Elements After Appending:  array('d', [22.5, 26.7, 35.6, 4.5, 96.9])

Example 4

In the following example we are appending a new element to a Python list using the append() method of the array module.

import array as arrmy_array = arr.array('i',[])my_list = [109, 909, 809, 209]my_array.extend(my_list)my_array.append(928772)print(my_array)

Output

array('i', [109, 909, 809, 209, 928772])