Create a printable text table string in Python

pretty_table.py

def pretty_table(rows, sep=' | '):
    rows = [[str(item) for item in row] for row in rows]
    columns = zip(*rows)
    widths = [max(len(item) for item in column) for column in columns]
    padded = [
        [item.ljust(width) for (item, width) in zip(row, widths)]
        for row in rows
    ]
    return '\n'.join(sep.join(row) for row in padded)