Header separator. Default to "-".
If header_sep only contains one character,
it will be repeated for each column.
If it contains more than one character,
it will be printed below the first row.
row_begin
Character at the beginning of each row.
Default to col_sep.
row_end
Character at the ending of each row.
Default to col_sep.
table_before
Characters to be printed before the table.
table_after
Characters to be printed after the table.
table_style
Name of pre-defined style.
Possible values are "plain", "md", "latex", or "booktabs".
Default to "plain".