A challenge in the beginner book "Automate the boring stuff":

#! Python3

# Table printer
# Takes a list of lists of strings and displays in right-justified table
# assumption is inner lists contain same number items
# each inner list must be printed as a column


the_list = [["a", "bbbbbbbbb", "tttt"],
            ["d", "eeee", "ggggggggggg"],
            ["g", "hhh", "kkkkkkkkkkkkkkkk"]]

def print_table(a_list):
    rows = len(the_list[0])
    columns = len(the_list)
    column_widths = [0 for i in range(columns)]
    # find longest string in each inner lists(or column)
    for i in range(len(column_widths)):
        longest = 0
        for item in a_list[i]:
            if len(item) > longest:
                longest = len(item)
        column_widths[i] = longest

    # store strings in list
    print_row = ["" for i in range(rows)]
    # iterate over lists to produce strings with correct formatting
    for a in range(rows):
        for i in range(columns):
            print_row[a] = print_row[a] + a_list[i][a].rjust(column_widths[i]
                                                             + 4)
    for item in print_row:
        print(item)
        
print_table(the_list)

Ok?