# [Tutor] Help with return results statement.

Vusa Moyo soweto at gmail.com
Thu Oct 22 05:31:22 EDT 2015

```Thanks Alan.

Removed that .

=====
def average(numbers):
total = sum(numbers)
total = total / len(numbers)

def get_average(student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])
return 0.1 * homework + 0.3 * quizzes + 0.6 * tests

if score >= 90:
return "A"
elif score >= 80:
return "B"
elif score >= 70:
return "C"
elif score >= 60:
return "D"
else:
return "F"

#Class average

def get_class_average(students):
results = []
for a in students:
b = float(get_average(a))
results.append(b)
return average(results)

# prompt for results.

students = [lloyd, alice, tyler]
print(get_class_average(students))
bother = get_class_average([lloyd, alice, tyler])

=====

Appreciate it.

Regards

Vusa

On Thu, Oct 22, 2015 at 11:14 AM, Alan Gauld <alan.gauld at btinternet.com>
wrote:

> On 22/10/15 10:03, Vusa Moyo wrote:
>
>> Hi Guys. Thanks for the responses and assistance.
>>
>> I came right after-all. The last 2 blocks read the following.
>>
>
> Glad you are happy but there is still something you could improve:
>
> def get_class_average(students):
>>     results = []
>>     for a in students:
>>         b = float(get_average(a))
>>
>
> You really don't need the float() here. get_average() is guaranteed
> to return a float.
>
>         results.append(b)
>>     return average(results)
>>
>>
>> students = [lloyd, alice, tyler]
>> print(get_class_average(students))
>> bother = get_class_average([lloyd, alice, tyler])
>>
>> Worked like a charm.
>>
>> Thanks for the assistance.
>>
>> Regards
>>
>> Vusa
>>
>>
>> On Tue, Oct 20, 2015 at 2:38 PM, Alan Gauld <alan.gauld at btinternet.com
>> <mailto:alan.gauld at btinternet.com>> wrote:
>>
>>     On 20/10/15 12:29, Vusa Moyo wrote:
>>
>>         Hi there. My script is as follows,
>>
>>
>>         alice = {
>>              "name": "Alice",
>>              "homework": [100.0, 92.0, 98.0, 100.0],
>>              "quizzes": [82.0, 83.0, 91.0],
>>              "tests": [89.0, 97.0]
>>         }
>>
>>
>>         def average(numbers):
>>
>>     >    total = sum(numbers)
>>     >    total = float(total)
>>
>>     That line isn't necessary since the inputs are floats already.
>>
>>     >    total = total / len(numbers)
>>     >
>>
>>         def get_average(student):
>>              homework = average(student["homework"])
>>              quizzes = average(student["quizzes"])
>>              tests = average(student["tests"])
>>              return 0.1 * homework + 0.3 * quizzes + 0.6 * tests
>>
>>              if score >= 90:
>>                  return "A"
>>              elif score >= 80:
>>                  return "B"
>>
>>
>>         print get_average(lloyd)
>>
>>         def get_class_average(students):
>>              results = []
>>              for a in students:
>>                  b = int(get_average(a))
>>                  results.append([b])
>>                  return results
>>
>>
>>         get_class_average(alice)
>>
>>         I receive a zero value for results, which doesnt quite make
>>         sense to me.
>>
>>
>>     Nor to me. Are you sure its a zero result? It should be a list of
>>     some kind not a number. Or do you mean you get an empty list back?
>>
>>     Notice that get_class_average() expects your students value to be
>>     some kind of sequence or collection. The for loop will iterate
>>     over that. If you pass Alice as a single student it will iterate
>>     over the keys, trying first of all to get the average of "Alice"
>>     which should fail with an error. Did you get any errors? If so
>>     please let us see them.
>>
>>     Please show us the actual code you execute, the actual output
>>     and the full text of any errors.
>>
>>     One other thing that seems weird to me is that you go to great
>>     pains to produce a float as a result of get_average() but then you
>>     immediately convert it to an int. Why not leave it as a float?
>>
>>
>>     --     Alan G
>>     Author of the Learn to Program web site
>>     http://www.alan-g.me.uk/
>>     http://www.amazon.com/author/alan_gauld
>>     Follow my photo-blog on Flickr at:
>>     http://www.flickr.com/photos/alangauldphotos
>>
>>
>>
>>     _______________________________________________
>>     Tutor maillist  - Tutor at python.org <mailto:Tutor at python.org>
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>>
>>
>
> --
> Alan G
> Author of the Learn to Program web site
> http://www.alan-g.me.uk/
> http://www.amazon.com/author/alan_gauld
> Follow my photo-blog on Flickr at:
> http://www.flickr.com/photos/alangauldphotos
>
>
```