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

Rabih Atallah
Rabih Atallah
3,405 Points

Script not not working

it tells me my code is returning 5 classes instead of 18. Please anyone has a suggestion

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.
def most_classes(teachers):
  max_count = 0
  L = []
  for k in teachers.keys():
    L.append(len(teachers[k]))

  for i in teachers.keys():
    if len(teachers[i]) == max(L):
      return i

def num_teachers(teachers):
  G = []
  for Y in teachers.keys():
    G.append(Y)
  return len(G)

def stats(teachers):
  A = []
  B = []
  for t in teachers.keys():
    A.append(t)
    A.append(len(teachers[t]))
  n = 0
  while n < (len(A) - 1):
    B.append(A[n:n+2])
    n = n + 2
  return B

def courses(teachers):
  X = []
  for v in teachers.values():
    X.append(v)
  return X

2 Answers

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,423 Points

So VERY close! You got 5 because you were appending the value of each teacher[key], which is a string. 5 teachers gives 5 strings gives 5 returned items. The method you need is extend() in place of append():

def courses(teachers):
  X = []
  for v in teachers.values():
    X.extend(v)
  return X
Rabih Atallah
Rabih Atallah
3,405 Points

Thanks very much Chris!! it worked