whats wrong with my code it works in pycharm 3.6

# 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.


dictionary = {"Andrew Chalkley": ['jQuery Basics', 'Node.js Basics'],
              "Kenneth Love": ["Python Basics", "Python Collections",]
              "Jay": ["bbbb", "aaaa", "cccc"]}
def num_teachers(dictionary):
    box1 = 0
    for key in dictionary.keys():
        box1 += 1
    return box1


def num_courses(dictionary):
    box2 = 0
    for dict in dictionary:
        box2 += len(dictionary[dict])
    return box2

def courses(dictionary):
    single_list = []
    for value in dictionary.values():
        single_list.extend(value)
    return single_list


def most_courses(dictionary):
    for key, value in dictionary.items():
        max_count = 3
        if len(value) == max_count:
            return key