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 (Retired) Dictionaries Teacher Stats

Sean Flanagan
Sean Flanagan
33,235 Points

Teacher Stats, Task 4

Hi.

The error message says I returned 11 courses when I should have returned 18.

I'd appreciate any help.

Sean

teachers.py
# The dictionary will be something like:
# {'Jason Seifer': ['Ruby Foundations', 'Ruby on Rails Forms', 'Technology Foundations'],
#  'Kenneth Love': ['Python Basics', 'Python Collections']}
#
# Often, it's a good idea to hold onto a max_count variable.
# Update it when you find a teacher with more classes than
# the current count. Better hold onto the teacher name somewhere
# too!
#
# Your code goes below here.
def most_classes(teachers_dict):
    count = 0
    for key in teachers_dict:
        if len(teachers_dict[key]) > count:
            count = len(teachers_dict[key])
            answer = key

    return answer

def num_teachers(teachers_dict):
    return len(teachers_dict)

def stats(teachers_dict):
    num_of_classes = []
    for teacher_name in teachers_dict:
        new_list = [teacher_name, len(teachers_dict[teacher_name])]
        num_of_classes.append(new_list)
    return num_of_classes

def courses(teachers_dict):
    my_list = []
    for teacher_name in teachers_dict:
        for list_of_courses in teachers_dict[teacher_name]:
            my_list.append(list_of_courses)
    return list_of_courses

1 Answer

Nick Osborne
Nick Osborne
4,612 Points

Hi Sean You need to return my_list, not list_of-courses:

def courses(teachers_dict):
    my_list = []
    for teacher_name in teachers_dict:
        for list_of_courses in teachers_dict[teacher_name]:
            my_list.append(list_of_courses)
    return (my_list)
Sean Flanagan
Sean Flanagan
33,235 Points

Hi Nick.

I've up-voted your solution and given you Best Answer.

Thanks for your help.

Sean :-)