Teacher Stats challenge 5:5. I don't know why it is giving me a "Didn't get the right output" error.

# 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(dictionary):
    count = 0
    for teachers in dictionary:
        count += 1
    return count

def num_courses(dict):
    course_list = []
    count = 0
    for value in dict.values():
        course_list.extend(value)
    count += len(course_list)
    return count

def courses(dict):
    course_list = []
    for value in dict.values():
        course_list.extend(value)
    return course_list

def most_courses(dict):
    maxNum = 0
    name = ''
    for teacher,course in dict.items():
        if len(course) > maxNum:
            name = teacher
            maxNum = len(course)
    return name

def stats(dict):
    teacher_list = []
    for teacher,course in dict.items():
        new_string = '{},{}'.format(teacher, int(len(course))).split(',')
        teacher_list.append(new_string)
    return teacher_list