Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Python Python Collections (2016, retired 2019) Dictionaries Teacher Stats

the course list

my code is here ,may I ask where is my mistake?

def courses(dictionary): all_class=[] for one_class in dictionary.values(): all_class.extend(one_class) return all_class

teachers.py
# 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 num_teachers(x):
    return len(x)

def num_courses(dictionary):
    count=0
    for teacher in dictionary:
        count+=len(dictionary[teacher])
    return count 


def courses(dictionay):
    all_clss=[]
    for one_class in dictionary.values():
        all_class.extend(one_class)
    return all_class

1 Answer

andren
andren
28,538 Points

Your code is logically sound, but you have two typos in it:

def courses(dictionay):

When defining the function you have misspelled dictionary as dictionay

all_clss=[]

And you define the list as all_clss instead of all_class

You spell these words correctly everywhere else in your code, so If you fix those two typos then your code will work.

oh~sorry I pasted the wrong one!!!