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

Henrique Costardi
Henrique Costardi
4,883 Points
Posted by Henrique Costardi
Henrique Costardi
4,883 Points

On stage 4 out of 5 Im getting the correct results in my terminal but wont accept in the test. any ideas?

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(arg): count = 0 for key in arg.keys(): count += 1 return count

def num_courses(arg): count = 0 courses = [] for value in arg.values(): courses.extend(value) for course in courses: count += 1 return count

def courses(arg): courses1 = [] for value in arg.values(): courses1.extend(value) return courses1

def most_courses(arg): for key in arg.keys(): temp_list = [] temp_list.extend(arg[key]) arg[key] = len(temp_list) max_count = max(arg.values()) for name, total in arg.items(): if total == max_count: top_teacher = name else: pass return top_teacher

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(arg):
    count = 0
    for key in arg.keys():
        count +=1
    return count

def num_courses(arg):
    count = 0
    courses = []
    for value in arg.values():
        courses.extend(value)
    for course in courses:
        count += 1
    return count

def courses(arg):
    courses1 = []
    for value in arg.values():
        courses1.extend(value)
    return courses1

def most_courses(arg):
    for key in arg.keys():
        temp_list = []
        temp_list.extend(arg[key])
        arg[key] = len(temp_list)
    max_count = max(arg.values())
    for name, total in arg.items():
        if total == max_count:
            top_teacher = name
        else:
            pass
    return top_teacher

1 Answer

Steven Parker
Steven Parker
231,271 Points
Steven Parker
Steven Parker
231,271 Points

Be careful about assuming you are "getting the correct results in my terminal".

There are two things that make this determination difficult:

  1. If you have incorrectly interpreted the challenge instructions in your coding, you will quite likely be applying the same incorrect interpretation to the results.
  2. The challenge will apply multiple test sets to evaluate your function. Your own test set(s) may not be extensive enough to reveal possible issues in the code.

Now, regarding your code, here's a few hints:

  • be sure to perform initializations before a loop
  • you only need one loop for this function
  • remember that each item in the dictionary will have a string and a list of classes
  • you can't compare a collection (like a list) directly to a scalar value (like int)
  • you can omit else entirely if all it does is pass