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# Python Program to Find Sum of Array

Last Updated on June 18, 2024 by Abhishek Sharma

Python is a versatile and powerful programming language widely used for various applications, including data analysis, web development, automation, and more. One common task in programming is working with arrays (or lists in Python) and performing operations on them. Calculating the sum of all elements in an array is a fundamental task that demonstrates the basics of array manipulation and iteration in Python. This article will explore a Python program designed to find the sum of an array, providing a detailed explanation of the code and its functionality.

## What are Arrays in Python

Python arrays are data structures like lists, which store homogenous data. Arrays store objects of the same datatype. Arrays are mutable, meaning that the data in an array can be changed and iterative, meaning each element in an array can be accessed one by one.

### Method 1: Using a For Loop

One straightforward way to find the sum of all elements in an array is by using a for loop. This approach involves iterating over each element in the array and adding it to a running sum.

Example to find the sum of an Array using for Loop:

``````def array_sum(arr):
total = 0
for num in arr:
total += num

# Example usage
array = [1, 2, 3, 4, 5]
print(array_sum(array))  ``````

Output:

``15``

### Method 2: Using the sum() Function

Python provides a built-in sum() function that simplifies the process of calculating the sum of all elements in an array. This function takes an iterable (such as a list) as its argument and returns the sum of its elements.

Example to find the sum of an array using the sum() function:

``````array = [1, 2, 3, 4, 5]
total = sum(array)
print(total) ``````

Output:

``15``

### Method 3: Using the numpy Library

If you are working with large arrays or need to perform complex numerical operations, using the numpy library can be beneficial. Numpy provides an efficient sum() function that works on arrays and offers additional functionality for scientific computing.

Example to find the sum of an array using numpy library:

``````import numpy as np
array = np.array([1, 2, 3, 4, 5])
total = np.sum(array)
print(total)  ``````

Output:

``15``

Conclusion
In this article, we explored how to write a Python program to find the sum of an array. This simple yet essential task highlights the basics of working with arrays in Python and introduces fundamental programming concepts such as loops and built-in functions. Understanding these concepts is crucial for any aspiring programmer, as they form the foundation for more complex operations and algorithms. By mastering array manipulation, you can efficiently handle and process data, paving the way for more advanced programming challenges.

Note: Remember to choose the most appropriate method based on the size of your array and any additional requirements you may have.

## FAQ’s related to Python Program to Find Sum of Array

Here are some of the FAQs related to Python Program to Find Sum of Array:

Q1: What is an array in Python?
In Python, an array is a collection of elements, typically of the same data type, stored in a single variable. The most commonly used array type in Python is the list, which can hold elements of different data types and allows for dynamic resizing.

Q2: How do you create an array in Python?
You can create an array in Python using the list data type. For example:

``my_array = [1, 2, 3, 4, 5]``

This creates a list named my_array with five elements.

Q3: How can you find the sum of elements in an array?
You can find the sum of elements in an array using a loop to iterate through the elements and accumulate the sum or by using Python’s built-in sum() function. For example:

``````my_array = [1, 2, 3, 4, 5]
total = sum(my_array)
print(total)  # Output: 15``````

Q4: What is the time complexity of finding the sum of an array?
The time complexity of finding the sum of an array is O(n), where n is the number of elements in the array. This is because you need to iterate through each element once to calculate the sum.

Q5: Can the sum() function be used with arrays containing non-numeric elements?
No, the sum() function can only be used with arrays containing numeric elements. If the array contains non-numeric elements, Python will raise a TypeError.