Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Functional Python The Lambda Lambada Reduce

Posted by Kay Pengelly
Kay Pengelly
5,985 Points

Combining reduce and add in functional python

Hi there,

I don't know why this code isn't passing the test - I'm being told that this is not the correct use for reduce, add, product_sales and prices however when I run this in Pycharm it works.

Could someone please help me out here?

prices.py 
from operator import add
from functools import reduce

prices = [
    (6.99, 5),
    (2.94, 15),
    (156.99, 2),
    (99.99, 4),
    (1.82, 102)
]

def product_sales(tpl):
    return tpl[0] * tpl[1]

total = reduce(add, (map(product_sales, prices)))

1 Answer

volhaka
volhaka
9,875 Points
volhaka
volhaka
9,875 Points

reduce ( function, sequence)

you have extra parenthesis

Kay Pengelly
Kay Pengelly
5,985 Points

Thank you!