Trouble with teachers.py task 4 of 5

# 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):
    return len(dict)

def num_courses(dict):
    list = []
    for v in dict.values():
        list += v
    return len(list)

def courses(dict):
    new_list = []
    for v in dict.values():
        for v in v:
            new_list.append(v)
    return new_list

def most_courses(dict):
    most_list = []
    for k in dict():
        for max_courses in dict[k]:
            most_list.append(max_courses)
    return (most_list)