Please help me with this.

# 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(teacher):           
    total = 0
    for value in teacher.values():
        for val in value:
            total += 1
    return total

def most_courses(dict):
    max_classes = 0
    for teacher in dict:
        classes = len(dict[teacher])
        if(classes>max_classes):
            max_classes = classes
        most_classes = teacher

    return most_classes