most_courses should return the name of the teacher with the most courses.

# 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(string):
    return len(string)

def num_courses(string):
    courses = 0
    for value in string.values():
        courses += len(value)
    return courses

def courses(teachers):
    course_list = []
    for value in teachers.values():
        for course in value:
            course_list.append(course)
    return course_list

def most_courses (string):
    max_name = None
    max_count = 0
    for teacher in string.keys():
        for course_list in string.values():
            if len(course_list) > max_count:
                max_count = len(course_list)
                max_name = teacher
            else:
                continue

    return max_name