#Author:  James Tam
#Version: October 31, 2025 (Boo!)
#Learning objective (extra practice for 2D lists since there haven't been
#a great deal of opportunity to do this with existing graded components).
#*Writing code: Nesting loops and branches in conjunction with a 2D list.
#*Filtering list elements according to a specified condition.


aList = [[2,-2,2,-2],
         [1,-1,1,-1]]

numRows = len(aList)
numColumns = len(aList[0])
r = 0
total = 0
numPositive = 0
while(r<numRows):
    c = 0
    while(c<numColumns):
        if(aList[r][c]>0):
            total = total + aList[r][c]
            numPositive = numPositive + 1
        c = c + 1
    r = r + 1
r = 0

theAverage = total/numPositive
print("Total of positive numbers:",total,"\tAverage of the posities:",theAverage)