Create a function named most_courses that takes our good ol' teacher dictionary.

# 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(dict_teachers):
    return len(dict_teachers)

def num_courses(dict_teachers):
    courses = []
    for course in dict_teachers.values():
        courses += course
    courses = set(courses)
    return len(courses)

def courses(dict_teachers):
    courses = []
    for course in dict_teachers.values():
        courses += course
    return set(courses)

def most_courses(dict_teachers):
    max_length = 0
    longest = ''
    for key, value in dict_teachers.items():
        if max_length = 0:
            max_length = len(value)
            longest = key
        elif len(value) > max_length:
            max_length = len(value)
            longest = key
    return longest