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

Einars Vilnis
Einars Vilnis
8,050 Points

Hi. fellow treehouse mates. i get bummer in the last task about courses. that says You returned 5 should be 18. why

i het all the values printed what is wrong with my answer?

# 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.
def most_classes(teachers):
  max_count = 0
  max_teacher = ''
  for key in teachers:
    class_count = len(teachers[key])
    if class_count > max_count:
      max_teacher = key                   #You have to reassign max_count to have the current
      max_count = class_count             #class count here
  return max_teacher

def num_teachers(teachers):
  count = 0
  for keys in teachers:
    count += 1
  return count

def stats(teachers):
  teacher_list = []
  for keys in teachers:
    teacher = [keys, len(teachers[keys])]
  return teacher_list

def courses(teachers):
  course_list = []
  for values in teachers.values():
  return course_list

1 Answer

Hi Einars,

teachers.values() returns a list. When appending a list to another list, you get a list of lists [[], [], []]. This challenge is expecting just one list. Instead of appending, there is an operator you can use to Combine Lists for the desired result.