Why am I getting a syntax error when I try to return the name of the teacher? ive been stuck on this for almost an hour

# The dictionary will be something like:
# {'Jason Seifer': ['Ruby Foundations', 'Ruby on Rails Forms', 'Technology Foundations'],
#  'Kenneth Love': ['Python Basics', 'Python Collections']}
#
# Often, it's a good idea to hold onto a max_count variable.
# Update it when you find a teacher with more classes than
# the current count. Better hold onto the teacher name somewhere
# too!
#
# Your code goes below here.
teach_dict ={'Jason Seifer': ['Ruby Foundations', 'Ruby on Rails Forms', 'Technology Foundations'],
'Kenneth Love': ['Python Basics', 'Python Collections']}
#
def most_classes(teach_dict):
  max_count = 0
  name = ""
  for teacher in teach_dict:
    if len(teach_dict[teacher]) > max_count:
      name = str(teacher)
      max_count = len[teach_dict[teacher]    
  return name


most_classes(teach_dict)