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

Posted by eliamani seushi
eliamani seushi
5,782 Points

stats should return a list of lists where the first item in each inner list is the teacher's name and the second item is

need help on task 5 of 5

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(dict):
    return len(dict)
def num_courses(dict):
    cnt=0
    for value in dict.values():
        cnt = cnt+len(value)
    return cnt
def courses(dict):
    courselist=[]
    for value in dict.values():
        for x in value:
            courselist.append(x)
    return courselist
def most_courses(dict):
    values = dict.values()
    keys = dict.keys()
    clist = max(values)

    for key in dict.keys():
        for value in values:
            if value == max(values):
                hold = key

    return hold
def stats(dict):
    keys = dict.keys()
    coursecnt=[]

    for key in dict.keys():
        for value in dict.values():
        #for v in value:
            coursecnt.append(len(value))

    statsdict = list(zip(keys, coursecnt))        
    return statsdict

2 Answers

ursaminor
ursaminor
11,271 Points

The challenge says to return a list of lists. Your code returns a list of tuples because zip() returns a list of tuples. You would have to turn each tuple into a list before returning it. For example:

    statsdict = zip(keys, coursecnt) 
    statsdict = [list(item) for item in statsdict]
    return statsdict

Here's a simpler way:

def stats(dict):
    course_list = []
    for key, value in dict.items():
        course_list.append([key, len(value)])
    return course_list
eliamani seushi
eliamani seushi
5,782 Points
eliamani seushi
eliamani seushi
5,782 Points

thanks