def show_docs() -> None:
    """
    Print the column ``doc`` attributes from the :class:`Postcode` class, in
    tabular form, to stdout.
    """
    # noinspection PyUnresolvedReferences
    table = Postcode.__table__
    columns = sorted(table.columns.keys())
    pt = prettytable.PrettyTable(
        ["postcode field", "Description"],
        # header=False,
        border=True,
        hrules=prettytable.ALL,
        vrules=prettytable.NONE,
    )
    pt.align = 'l'
    pt.valign = 't'
    pt.max_width = 80
    for col in columns:
        doc = getattr(Postcode, col).doc
        doc = wordwrap(doc, width=70)
        ptrow = [col, doc]
        pt.add_row(ptrow)
    print(pt.get_string())