returning name of the teacher with the most number of 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(tutors):
    count = len(tutors.keys())
    return count

def num_courses(tutors):
    count = 0
    course_list = []
    for name in tutors.keys():
        for course in tutors[name]:
            if course not in course_list:
                course_list.append(course)
    return len(course_list)

def courses(tutors):
    avail_courses = []
    for courses in tutors.values():
        avail_courses.extend(courses)

    return avail_courses

def most_courses(tutors):
    course_count = 0
    teacher_name = ''
    for name, courses in tutors.items():
        lf len(courses) > course_count:
            course_count = len(courses)
            teacher_name = name
        else:
            continue
    return teacher_name