Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python

Carlos Guzman
Carlos Guzman
1,300 Points
Posted by Carlos Guzman
Carlos Guzman
1,300 Points

Code Improvement - Stats Challenge

Looking to improve my code. It's definitely messy and this is the first problem that gave me a good challenge.

    my_dict = {'Jason Seifer': ['Ruby Foundations', 'Ruby on Rails Forms', 'Technology Foundations'], 
    'Kenneth Love': ['Python Basics', 'Python Collections', 'Python Stuff', 'Python other stuff']}

    def most_classes(dicts):
        max_count = 0
        teacher_name = None
        for key in dicts:
            if len(dicts[key]) > max_count:
                max_count = len(dicts[key])
                teacher_name = key
        return teacher_name

    print(most_classes(my_dict))


    def num_teachers(dicts):
        teacher_number = len(dicts.keys())
        return teacher_number

    print(num_teachers(my_dict))

    def stats(dicts):
        the_list = []
        for key in dicts:
            teacher_name = key
            num_classes = len(dicts[key])
            new_list = [teacher_name, num_classes]
            the_list.append(new_list)
        return the_list

    print(stats(my_dict))

    def courses(dicts):
        courses = []
        for key in dicts:
            courses += dicts[key]
        return courses

    print(courses(my_dict))

1 Answer

Steven Parker
Steven Parker
231,275 Points
Steven Parker
Steven Parker
231,275 Points

These functions can be compacted into one-liners, using list comprehension, lambda, and reduce (which are probably concepts that are introduced later or in more advanced courses):

from functools import reduce

def stats(dicts):
    return [ [key, len(dicts[key])] for key in dicts ]

def most_classes(dicts):
    return reduce(lambda x,y: x if x[1] > y[1] else y, stats(dicts))[0]

def num_teachers(dicts):
    return len(dicts.keys())

def courses(dicts):
    return [ dicts[key] for key in dicts ]
Carlos Guzman
Carlos Guzman
1,300 Points
Carlos Guzman
Carlos Guzman
1,300 Points

Thanks! I was kind of hoping to compact the code without having to import any libraries. But this at least gives me a library to look into.

Steven Parker
Steven Parker
231,275 Points
Steven Parker
Steven Parker
231,275 Points

Reduce used to be a built in, in older Python versions. They moved it to functools in the newer versions.

All these concepts are introduced at some point on the Python track.