Using Python to Sum Even Numbers in List

To sum the even numbers in a list in Python, the easiest way is with list comprehension and the Python sum() function.

lst = [0, 4, 6, 9, 2, 3, 1]

s = sum([num for num in lst if num % 2 == 0])

print(s)

#Output:
12

You can also use a loop to sum the number of even numbers in a list in Python.

lst = [0, 4, 6, 9, 2, 3, 1]

def sumEvens(l):
    sum = 0
    for num in l:
        if num % 2 == 0:
            sum = sum + num
    return sum

print(sumEvens(lst))

#Output:
12

When working with collections of data, the ability to easily summarize and get statistics about the collection is valuable.

One such case is if you want to sum the even numbers in a list.

To sum the even numbers in a list in Python, the easiest way is with list comprehension and the Python sum() function. To get the even numbers, we just need to check if the number is even or odd.

Below is a simple example showing you how to sum the number of even numbers in a list using Python.

lst = [0, 4, 6, 9, 2, 3, 1]

s = sum([num for num in lst if num % 2 == 0])

print(s)

#Output:
12

Finding Count of Even Numbers Using sum() in Python

You can use other functions to summarize collections of data in Python just like with sum().

One example is if you want to find the count of the even numbers of a list.

In this case, you can use the Python len() function.

Below is an example showing you how to count the even numbers of a list using Python.

lst = [0, 4, 6, 9, 2, 3, 1]

count = len([num for num in lst if num % 2 == 0])

print(count)

#Output:
4

Get Sum of Odd Numbers in List Using Python

If you want to go the other way and get the sum of odd numbers in a list using Python, you can just make a simple adjustment to the code above.

When using % to check if the number is even or odd, for odd numbers we want inequality.

Below is an example showing you how to sum the odd numbers in a list using Python.

lst = [0, 4, 6, 9, 2, 3, 1]

s = sum([num for num in lst if num % 2 != 0])

print(s)

#Output:
13

Hopefully this article has been useful for you to learn how to sum the even numbers in a list using Python.