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!

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

Posted by Elijah Newell
Elijah Newell
3,355 Points

I have trouble starting challenges like this, can someone please help quickly?

I just need help getting started.

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():

2 Answers

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,332 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,332 Points

The argument passed in will be a dict will looking something like:

{'Andrew Chalkley': ['jQuery Basics', 'Node.js Basics'],
'Kenneth Love': ['Python Basics', 'Python Collections']}

Let’s call the argument teachers.

  • To get a list of teacher (the dict keys), you could use teachers.keys()
  • the number of teachers would be len(teachers.keys()) or len(teachers) since without a method, it is assumed you are referring to the dict keys.

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

Elijah Newell
Elijah Newell
3,355 Points
Elijah Newell
Elijah Newell
3,355 Points

I solved it! Thanks Chris, really appreciate it!