Updated April 20, 2023
Introduction to Python Array Length
In this article array length in Python is defined as the array consisting of a set of elements or items that can also be considered as a list of items in the given array. And the length of the array which is computed as the total number of elements or items in the given array using various methods or functions such as len() method that returns the total number of elements of the given array as the length of the array where it is always one more than the highest array index which is in integer format that is indexing starting from 0, not 1 and this is known as array length.
Working of Python Array Length
In the below section we will see how to compute array length for the given array using Python programming language. In Python, the array length is calculated using len() method and in the below program let us demonstrate it.
Let us see the syntax of the method len() in python:
len( given_arr_name )
In the above syntax, we can see we have passed the array name of which the array length needs to be computed. This function returns the integer value that is equal to the total number of elements present in the array that is passed as an argument to the function.
Examples of Python Array Length
Below are the different examples to calculate the length of an array using Python:
print("Program to demonstrate the len() method in Python")
arr1 = [2,'educba', 3, 4.5]
print("The given array is as follow:")
print("The length of the given array arr1 is: ")
In the above program, we can see we have declared array using square brackets, also known as Python lists. In the given list or array named arr1, we have different elements of different data types like integer, string, float, etc. In the above program, we are trying to print the length of the given array arr1 by passing it to the len() method. This method returns the number of elements present in the given array. In the screenshot, we can see the output showing the output of the len() method as 4 which means there are 4 elements present in the given array before it prints the entire array declared.
In Python, the array is helpful to reduce the overall size of the code by just declaring the array name and array size or length explicitly which can be easy to save any number of elements in the array and Python, there is a module named array that can be imported for working with array and its length or size.
In Python, it provides a module named array where it holds different methods and it is easy for declaring array also. In the below section, let us see how to use an array module for declaring array and finding its length using len() function. Below is the program to demonstrate how to find array length using the array module.
import array as arr1
print("Program to demonstrate array length using array module")
a=arr1.array('i', [1, 8, 4] )
print("The array created is as follows:")
print("The length of the given array is as follows:")
In the above program, we can see that first, we have imported array module and then we are using an array object arr1 to define array we can see in the line 6 we are defining array where “i” refers to integer data type, where we can use “d” for floating point, etc. Then we are printing the array that is created using array object arr1 and then we are using len() function by passing the created array to this function which is stored in the variable “a”. When we print the result of the len() function then it returns the integer value of the number of elements present in the given array. From the above screenshot, we can see that the length of the given array is 3 as there are 3 items in the given array in the above program.
In Python, the array length is a concept that can be used in various applications where we want to store data of the same data types and also can store any number of items in the array and can also access any element of the array by using its index. In Python, the array length is can be used for defining the array capacity, which means when we know the fixed data to be defined or if the users are not able to find the data capacity declared for the array then we can use this array length concept to find the number of elements present in the given or declared array.
In this article, we conclude that in Python array and list data structures are two different things. Therefore, in this article, we saw the definition of array length used to find the total number of items present in the given array. In this, we also saw how we can compute array length in the Python program using len() function, for example. In this, we also saw how len() function is available in array module in Python in this article we saw how it can be demonstrated and we also the examples. We can conclude that array length is a concept of finding the array size of the given or declared array.
This is a guide to Python Array Length. Here we discuss working of the len() in python to calculate the total number of items present in the given array along with examples and its code implementation. You may also have a look at the following articles to learn more –