Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

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

Sohail Mirza
seal-mask
.a{fill-rule:evenodd;}techdegree
Sohail Mirza
Python Web Development Techdegree Student 5,158 Points

why my code does not work.total number of teachers in a dictionary

I need to get the total number of teachers but the following code does not work def num_teachers(teacher): for item in teacher.keys(): print(len(item))

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.

1 Answer

diogorferreira
diogorferreira
19,363 Points

When you loop through the item, each separate item would be something like Andrew Chalkley or Kenneth Love, so by calling len() on the items, you are getting the number of characters each string has not the number of teachers there are. Try to create a count variable, and increase it every time you loop and then return it.

Hope it helps.