Couldn't find '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(dict): 
    count= 0
    for key in dict:
        count +=1
    return count



def num_courses(dict):
    course_count = []
    for teachers in dict:
        for courses in dict[teachers]:
            course_count.append(courses)
    return len(course_count)

def courses(dict):
    course_count = []
    for teachers in dict:
        for courses in dict[teachers]:
            course_count.append(courses)
    return course_count

def most_courses(dict):
    most_teacher = ''
    max_count = 0
    for teacher, courses in teacher.items():
        if len(courses) > max_count:
            most_teacher = teacher
            max_count = len(courses)
    return most_teacher