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Kyle Hahnel
Python Web Development Techdegree Student 5,670 PointsError: Returned 5, expected to return 18. Teacher Stats Challenge question.
I am getting a strange error message when attempting to run the code for the 4th part of the Teacher Stats Challenge. As far as I can tell, the code is working. It is returning the correct number of courses available in the dictionary, which is 5. Any help is appreciated!
dict = {'Jason Seifer': ['Ruby Foundations', 'Ruby on Rails Forms', 'Technology Foundations'], 'Kenneth Love':
['Python Basics', 'Python Collections']}
def most_classes(dict):
count = 0
teacher = ""
for items in dict:
classes = len(dict[items])
if classes > count:
count = classes
teacher = items
return teacher
def num_teachers(dict):
return len(dict)
def stats(dict):
lists = []
try:
for item in dict:
new_count = 0
for second_item in dict[item]:
new_count += 1
lists.append([item,new_count])
except:
You = True
return lists
def courses(dict):
all_courses = []
for course in dict:
all_courses.append(dict[course])
return all_courses
3 Answers
Chris Freeman
Treehouse Moderator 68,428 PointsFor the courses() function, the dictionary passed in contains teachers as keys and their courses as a list. Your code is actually building a list of lists. So the top level element count will be equal to the number of teachers in the dict.
The code below uses extend() to add the elements of the teacher's course list to your all_courses list.
def courses(dict):
all_courses = []
for teacher in dict: #<-- change loop variable to "teachers" for clarity
all_courses.extend(dict[teacher]) #<-- changed append to extend
return all_courses
Kenneth Love
Treehouse Guest TeacherYou're appending the list of courses to your returned list. That means the returned list's length will be however many sublists are in it. Look at this:
returned_list = [[1, 2], [3, 4, 5], [6, 7, 8, 9]]
The length of returned_list is 3. You need to .extend() your returned list with the list for each teacher instead of .append()ing it.
Kyle Hahnel
Python Web Development Techdegree Student 5,670 PointsI misunderstood the directions, thanks!