How to Calculate the Sum of Integers in a List Using Python: Sum() vs. Reduce()?

How to Calculate the Sum of Integers in a List Using Python

Suppose you have a list of integers like [2, 4, 7, 12, 3]. The objective is to find the total sum of these numbers, resulting in 28.

To address this issue in Python, we present two viable solutions:

Solution 1: Using the sum() Function

The sum() function in Python provides a straightforward method for adding all the elements in a list. In our case, we would use it as follows:

<code class="python">x = [2, 4, 7, 12, 3]
sum_of_all_numbers = sum(x)</code>

Solution 2: Utilizing the reduce() Function with a Lambda Function

Alternatively, we can employ the reduce() function in conjunction with a lambda function. Reduce iteratively applies a function to each element of a list, resulting in a single cumulative value:

<code class="python">import functools

x = [2, 4, 7, 12, 3]
sum_of_all_numbers = functools.reduce(lambda q, p: p + q, x)</code>

In this case, the lambda function (lambda q, p: p q) represents an addition operation. Reduce iteratively adds the list elements using this addition function, producing the same result as the sum() function.

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