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Python Python Collections (Retired) Dictionaries Teacher Stats

treehouse IDE incorrectly grading function?

So the treehouse IDE states that my function returns the wrong value. However, when I try the function outside of the IDE it works as expected. Any help here?


# 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.
def most_classes (teacher_dict):
    copy_dict = teacher_dict
    max_teacher = ""
    max_count = 0

    for teacher, classes in copy_dict.items():
        if len(classes) > max_count:
            max_teacher = teacher
    return max_teacher

1 Answer

Chris Freeman
Chris Freeman
Treehouse Moderator 68,423 Points

You are very close. How are you keeping track of the current value of max_count? It doesn't seem to be getting updated anywhere.

Also, it is not necessary to make a copy of the teacher_dict. In this challenge you can use teacher_dict directly. In reality, the copy you've attempted is not actually a copy of the dict, but rather just a reference copy. Both copy_dict and teacher_dict point to the same object. Checking this in the REPL:

$ pythonPython 3.4.0 (default, Jun 19 2015, 14:20:21) 
[GCC 4.8.2] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> teacher_dict = {'Anne': ['course1', 'course2']}
>>> copy_dict = teacher_dict
>>> copy_dict is teacher_dict