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

Siddharth Pande
Siddharth Pande
9,046 Points

tried everything but in vain

Wow, I just can't stump you! OK, two more to go. I think this one's my favorite, though.

Create a function named most_courses that takes our good ol' teacher dictionary.

most_courses should return the name of the teacher with the most courses. You might need to hold onto some sort of max count variable.

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(tree_dict):
    intr = len(tree_dict)
    return intr
def num_courses(tree_dict):
    values = list(tree_dict.values())
    count = 0
    for item in values:
        for i in item:
            count += 1
    return count
def courses(tree_dict):
    final_list =[]
    values = tree_dict.values()
    for item in values:
        for i in item:
            print(i)
            final_list.append(i)
    return final_list
def most_courses(tree_dict):
    value_list = []
    key_list = []
    for item in tree_dict.values():
        value_list.append(item)
    for item in tree_dict.keys():
        key_list.append(item)
    if len(value_list[0]) > len(value_list[1]):
        return key_list[0]
    elif len(value_list[0]) < len(value_list[1]):
        return key_list[1]
    else:
        return (key_list[0], key_list[1])

1 Answer

Steven Parker
Steven Parker
231,269 Points

Here's a few hints:

  • you don't need to create any additional lists
  • you should only need one loop
  • you've already counted courses in "num_courses"
  • this time, you can do something similar but also keep track of the highest count (and associated teacher)
  • after checking them all, return only the name of the teacher that had the most courses