''' 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 )

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

print()

# print each row of the table along withs number of columns
for row in table :
    ncols = len( row )
    print( "row", row, "has", ncols, "columns" )

print()

# print each row of the table using row indices
for r in range( 0, nrows ) :
    row = table[ r ]
    print( "row", r, ":",  row )

print()

# individually print in people form the cells in the list of rows
for row in table :
    print( "row :", end=" " )
    for cell in row :
        print( cell, end=" " )
    print()

print()

# individually print each row and column of the table using row 
# and column indices to look into the table
for r in range( 0, nrows ) :
    row = table[ r ]
    ncols  = len( row )
    print( "row", r, ":",  row )
    for c in range( 0, ncols ) :
        cell = table[ r ][ c ]
        print( "    column", c, "of row", r, ":", cell )
    print()


# print the table in people form using row and column indices
# to look into the table
for r in range( 0, nrows ) :
    print( "row", r, ":", end=" " )
    ncols  = len( table[ r ] )
    for c in range( 0, ncols ) :
        cell = table[ r ][ c ]
        print( cell, end=" " )
    print()

print()

# print a requested column as a list

reply = input( "Enter column of interest: " )

c = int( reply )

# need to accumulate the cells in the column c
column = []

for row in table :
    # get cell in column c of the row
    cell = row[ c ]
    column.append( cell )
    
    print( "Column", c, "cell:", cell )

print()

print( "Column", c, ":", column )