What's wrong on my code on Challenge: Creating a function 'stats'?

# 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.
# Task 1 of 4
# Create a function named 'most_classes' that takes a dictionary
# of teachers and returns the teacher with the most classes.
def most_classes(dct):
    count = 0
    teacher = ""
    for item in dct:
        classes = len(dct[item])
        if classes > count:
            count = classes
            teacher = item
    return teacher


# Task 2 of 4
# Create a function named 'num_teachers' that takes a dictionary
# of teachers and returns the number of teachers.
def num_teachers(dct):
    return len(dct)

# Your code:
def stats(teachersDict):
    theList = [] 
    for key in teachersDict: 
        theList.append([key, len(teachersDict[key])])
    return theList