In my terminal the code works, but wont approve in the test.. any ideas? thanks

# 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 most_classes(dicts):
  most_class =""
  max_count =0
  for teacher in dicts:
    if len(dicts[teacher])>max_count:
      max_count = len(dicts[teacher])
      most_class = teacher
  return most_class
def num_teachers(test2):
  return len(test2)
def stats (test3):
  new_list = []
  for key in test3:
    holder = []
    holder.append(key)
    holder.append(len(test3[key]))
    new_list.append(holder)
  return new_list
def courses(teach_dict):
  my_list=[]
  for teachers in teach_dict():
    for courses in teach_dict[teachers]:
      my_list.append(courses)
return my_list