#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).
#*Tracing a 2D list example with a common logic error



aList = [[1,1,1,1],
         [2,2,2,2],
         [3,3,3,3],
         [4,4,4,4]]

numRows = len(aList)

#List is rectangular and a 2D list consists of rows of 1D lists so the width
#of any row is the number of columns.
numColumns = len(aList[0])

r = 0
while(r<numRows):
    c = 0
    while(c<numColumns):
        #Python automatically adds a newline to the end of the string.
        #end="" overrides this by stating the end of the line is a space
        #  instead of a newline i.e. the newline is 'suppressed'
        print(aList[c][r], end=" ")
        c = c + 1
    print() #Reached end of row, move next tow to the next line
    r = r + 1