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Python Python Collections (2016, retired 2019) Dictionaries Teacher Stats

Posted by Tristan Rodgers
Tristan Rodgers
8,137 Points

cant get number of courses

Trying to get the total number of courses, not most courses. Can't find a solution

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(dictionary):
    return len(dictionary)

def num_courses(dictionary):
    courses = []
    num = len(courses)
    for value in dictionary.values():
        courses.extend(value)
    return (num)

1 Answer

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

You are close. The value of num is set while the courses list is still empty and not updated later. One fix would be to move the num assignment to after the for loop.

You have a unique approach. Alternatively, you could init num to 0, then increase the value by the length of value in each loop.

Post back if you need more help. Good luck!!!

Tristan Rodgers
Tristan Rodgers
8,137 Points

ahh, I see now, thank you Chris for the feedback!