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Start your free trialDavid Wright
4,437 Pointsteachers.py - Teachers that teach the most_classes using Dictionaries
Please don't give me the answer, unless I am WAY OFF
Do I need to unpack the dictionary using (**key) or is that not necessary/suggested for this code challenge?
I think I'm having trouble with returning the correct teacher that associates with my max_count variable (which I attempted to create using a nested loop and the 'value in teacher_dict.values()' loop) -- Thank you!
# 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.
teacher_dict = {}
def most_classes(teacher_dict):
max_count = 0
for key in teacher_dict:
teacher_name = key
for value in teacher_dict.values():
if len(value) > max_count:
max_count = len(value)
max_teacher = key
return max_teacher
2 Answers
Chris Freeman
Treehouse Moderator 68,454 PointsThe issue is in the nested for-loops
. With the nesting loops, all of the values
will be evaluated with the first key
. What you want is to grab the key
and value
at the same time using .items()
:
for key in teacher_dict:
teacher_name = key
for value in teacher_dict.values():
becomes
for key, value in teacher_dict.items():
Peter Lynch
946 PointsChris where did the course cover .item()? I would like to go over it again.
Chris Freeman
Treehouse Moderator 68,454 PointsPeter, the dictionary method .items()
wasn't covered in the stage Python Collections. I'm not sure which module it is covered it. I might have picked in up looking at the documentation for .values()
after the video Dictionary Iteration. Sorry for getting ahead of the course material. If I come across the Treehouse lesson on .items()
I'll post back.
Information on dictionary .keys()
, .values()
, and .items()
can be found in the Python docs
David Wright
4,437 PointsThank you so much, Chris! This makes so much sense, If only I knew that I could "grab" both the key and value using a single for loop! But, now I do!
You're Awesome Chris! Once again, thank you for all your help!
Chris Freeman
Treehouse Moderator 68,454 PointsChris Freeman
Treehouse Moderator 68,454 PointsUsing double-asterisks is not needed for this challenge.