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

Shangyi Zhu
Shangyi Zhu
2,265 Points

Don't understand why this is not letting me pass. My code works...

Don't understand why this is not letting me pass. My code works... It meets all the requirements stated in the objective... total = reduce(add,list(map(product_sales, prices)))

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

def product_sales(price_unit):
    price, unit = price_unit
    return price * unit

from operator import add

from functools import reduce

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

2 Answers

Steven Parker
Steven Parker
229,965 Points

It's not necessary to convert the "map" output to a list, and apparently that's confusing the validator.

But since this shouldn't hurt anything in actual practice, you might want to report it as a bug to the Support folks.