I have a question. I am trying to write a program that takes as input a list who

Question

I have a question. I am trying to write a program that takes as input a list whose items are lists of three numbers. Each three-number list represents the three grades a particular student received for a course. For example, here is an input list for a class of four students: [[95,92,86], [66,75,54], [89,72,100], [34,0,0]]

this function should print, on the screen, two lines. The first line will contain a list containing every student's average grade. The second line will contain just one number: the average class grade, defined as the average of all students average grades. For instance here is the invoke and the output

>>> avgavg([[95,92,86], [66,75,54], [89,72,100], [34,0,0]])

[91.0,65.0,87.0,11.33333333333334]

63.58333333333

However, my first step is iterating over the lists. My logic is a big flawed. I am having trouble trying to get the function to iterate over each item of the list just once. Here is my code so far as I am breaking the problem down into subproblems-i am stariting with this problem which is iteration over the items:

def avgavg(lst):

    studentAvg = []

    #Avg = sum(lst)/len(lst)

    for row in lst:

        for item in row:

            print(row)

and here is my output:

[95, 92, 86]

[95, 92, 86]

[95, 92, 86]

[66, 75, 54]

[66, 75, 54]

[66, 75, 54]

[89, 72, 100]

[89, 72, 100]

[89, 72, 100]

[34, 0, 0]

[34, 0, 0]

[34, 0, 0]

Does anyone have any hints as to what I am doing wrong?

Thanks

Explanation / Answer

For better readable code see here : http://pastebin.com/KsN2cJSa

def avgavg(lst):

studentAvg = []

for row in lst:

studentTotal=0

for item in row:

studentTotal=studentTotal+item #summing marks of a student

studentTotal=studentTotal/3 #Find student average

studentAvg.append(studentTotal) #add this avg to list of averages

print(studentAvg)

avgTotal=0

for item in studentAvg:

avgTotal=avgTotal+item #now add each avg to get overall average.

avgTotal=avgTotal/len(studentAvg) #divide by number of student

print (avgTotal) #dispaly overall average

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