code: def convertnumbers(table, strict=False, **kwargs):
      
  
      return convertall(table, numparser(strict), **kwargs)
docs: Convenience function to convert all field values to numbers where
      possible. E.g.::
  
          >>> import petl as etl
          >>> table1 = [['foo', 'bar', 'baz', 'quux'],
          ...           ['1', '3.0', '9+3j', 'aaa'],
          ...           ['2', '1.3', '7+2j', None]]
          >>> table2 = etl.convertnumbers(table1)
          >>> table2
          +-----+-----+--------+-------+
          | foo | bar | baz    | quux  |
          +=====+=====+========+=======+
          |   1 | 3.0 | (9+3j) | 'aaa' |
          +-----+-----+--------+-------+
          |   2 | 1.3 | (7+2j) | None  |
          +-----+-----+--------+-------+