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

SUDHARSAN CHAKRAVARTHI
PLUS
SUDHARSAN CHAKRAVARTHI
Courses Plus Student 2,434 Points
Posted by SUDHARSAN CHAKRAVARTHI
SUDHARSAN CHAKRAVARTHI
Courses Plus Student 2,434 Points

Dictionary - to find the count of values for particular key

is there better way to find the count of number of values for particular key in dictionary:

for key,value in my_dict.items():
    temp_count = len(list(filter(bool, value)))
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.

my_dict = {'Jason Seifer': ['Ruby Foundations', 'Ruby on Rails Forms', 'Technology Foundations'],'Kenneth Love': ['Python Basics', 'Python Collections']}

def most_classes(my_dict):
    max_count = 0
    max_class_teacher = ""
    for key,value in my_dict.items():
        temp_count = len(list(filter(bool, value)))
        if max_count < temp_count:
            max_count = temp_count
            max_class_teacher = key
    return max_class_teacher

2 Answers

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,441 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points

If the assumption is the values in the dictionary are lists, couldn't you simply use len()?:

temp_count = len(value)