""" Purpose: introductory take on examining a table of values
"""

# define table
table = [ ["A", "B", "C" ], [ "D", "E", "F" ], [ "G", "H", "I" ], [ "J", "K", "L", "M" ] ]

print( "table:", table )

print()

# determine number of rows in table
nrows = len( table )
# len( table ) returns the number of lists in our larger list table, which is the number of rows

print( "the table has", nrows, "rows" )

print()

# print each row of the table along withs number of columns
for row in table : # row is our loop variable that will take on a different list each run of the for loop
    # everywhere that we type row means that is a place that we want to process each row of the table
    ncols = len( row )
    # len( row ) is the number of elements in that list, which is the number of columns
    # note: the column number can vary from row to row
    print( "row", row, "has", ncols, "columns" )

print()

# print each row of the table using row indices
for r in range( 0, nrows ) :
    # processing and printing in a for loop can help with readability, as we want rows to be on different
    # lines of output
    # sometimes the r/index is going to be handy, so remember anytime you're processing a list you can
    # loop through the list or use the range() and access the list using indices
    row = table[ r ]
    # you find rows through indexing your dataset/table data[ row ] is going to be a list
    print( "row", r, ":",  row )