Method headings

Solutions/8_2/tableformat.py:20–24

(self, headers)

    Output data in plain-text format.
    '''
    def headings(self, headers):
        for h in headers:
            print(f'{h:>10s}', end=' ')
        print()
        print(('-'*10 + ' ')*len(headers))

    def row(self, rowdata):
        for d in rowdata: