# Finding the Product of a List in Python Made Easy

Finding the product of all elements in a list can be a useful operation for many purposes like calculating total, interest, discount etc. In this tutorial we will learn how to calculate the product of …

Updated November 21, 2023

Finding the product of all elements in a list can be a useful operation for many purposes like calculating total, interest, discount etc. In this tutorial we will learn how to calculate the product of an array or a list using python programming language.

In Python, finding the product of all elements in a list is straightforward with the use of built-in `reduce()` function from `functools` module and a lambda function. The reduce() function applies binary function passed to it to each element of sequence(list) in order so as to reduce the sequence to single output.

Here’s an example:

``````from functools import reduce
product_list = [1, 2, 3, 4, 5]
print(reduce((lambda x, y: x * y), product_list)) # Output: 120
``````

In the above example, for each number in our list `product_list`, we are multiplying them together. The final result is printed out to be `120`.

Please note that this method may not be efficient on large lists because it requires going through the entire list multiple times. To find the product of a large list, you may want to use a loop or other methods optimized for speed and memory usage.

Alternatively, you can also calculate the product using numpy:

``````import numpy as np
product_list = [1, 2, 3, 4, 5]
print(np.prod(product_list)) # Output: 120
``````