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 Python Collections (2016, retired 2019) Dictionaries Teacher Stats

Posted by behar
behar
10,799 Points

This works in the shell..

This works perfectly fine in the shell, but the checker dosent like it. Anybody?

teachers.py 
# The dictionary will look something like:
# {'Andrew Chalkley': ['jQuery Basics', 'Node.js Basics'],
#  'Kenneth Love': ['Python Basics', 'Python Collections']}
#
# Each key will be a Teacher and the value will be a list of courses.
#
# Your code goes below here.
def num_teachers(var):
    test = 0
    for teachers in var:
        test += 1
    return test

def num_courses(var):
    test1 = []
    for value in var.values():
        test1.append(value)
    return len(test1)

3 Answers

David Dzsotjan
David Dzsotjan
5,929 Points
David Dzsotjan
David Dzsotjan
5,929 Points

Hi! I think the problem is that you append not elements, but whole lists to your original list. Instead, I'd write

def num_courses(var):

    test1 = []

    for value in var.values():
        test1 += value
    return len(test1)

so you just add up your lists and won't have lists nested in lists.

behar
behar
10,799 Points

Thats weird but thank you!

David Dzsotjan
David Dzsotjan
5,929 Points
David Dzsotjan
David Dzsotjan
5,929 Points

No problem :) - does it work this way?

behar
behar
10,799 Points

Yup it passed