Tutorial

Python sum()

Published on August 3, 2022
author

Pankaj

Python sum()

While we believe that this content benefits our community, we have not yet thoroughly reviewed it. If you have any suggestions for improvements, please let us know by clicking the “report an issue“ button at the bottom of the tutorial.

Python sum() function is used to get the sum of numbers of an iterable.

Python sum()

Python sum() function syntax is:

sum(iterable[, start])

start is an optional number with default value of 0. If start is provided, then the sum of start and all the numbers in the iterable is returned.

Python sum() list of numbers

s = sum([1, 2, 3])
print(s)

s = sum([1, 2, 3], 10)
print(s)

Output:

6
16

Note that sum() method doesn’t take keyword arguments, so if we write sum([1, 2, 3], start=10) then it will throw exception as TypeError: sum() takes no keyword arguments.

Python sum of a sequence of integers

Since sum accepts iterable as argument, we can pass tuple, bytes of numbers too.

s = sum(bytes([1, 2]))
print(s)

s = sum(bytearray([1, 2]), 10)
print(s)

# sum of integers in different formats, tuple of numbers
s = sum((1, 0b11, 0o17, 0xFF))
print(s)

s = sum((1, 0b11, 0o17, 0xFF), 0xF)
print(s)

Output:

3
13
274
289

Python sum of floats

s = sum([1.5, 2.5, 3])
print(s)

Output: 7.0 If you want to add floating point values with extended precision, you can use math.fsum() function.

Python sum of complex numbers

sum() function works with complex numbers too.

s = sum([1 + 2j, 3 + 4j])
print(s)

s = sum([1 + 2j, 3 + 4j], 2 + 2j)
print(s)

s = sum([1 + 2j, 2, 1.5 - 2j])
print(s)

Output:

(4+6j)
(6+8j)
(4.5+0j)

You can checkout complete python script and more Python examples from our GitHub Repository.

Reference: Official Documentation

Thanks for learning with the DigitalOcean Community. Check out our offerings for compute, storage, networking, and managed databases.

Learn more about our products


About the authors
Default avatar
Pankaj

author

Still looking for an answer?

Ask a questionSearch for more help

Was this helpful?
 

Try DigitalOcean for free

Click below to sign up and get $200 of credit to try our products over 60 days!

Sign up

Join the Tech Talk
Success! Thank you! Please check your email for further details.

Please complete your information!

Featured on Community

Get our biweekly newsletter

Sign up for Infrastructure as a Newsletter.

Hollie's Hub for Good

Working on improving health and education, reducing inequality, and spurring economic growth? We'd like to help.

Become a contributor

Get paid to write technical tutorials and select a tech-focused charity to receive a matching donation.

Welcome to the developer cloud

DigitalOcean makes it simple to launch in the cloud and scale up as you grow — whether you're running one virtual machine or ten thousand.

Learn more
DigitalOcean Cloud Control Panel