def header(table):
    """
    Return the header row for the given table. E.g.::
    
        >>> from petl import header
        >>> table = [['foo', 'bar'], ['a', 1], ['b', 2]]
        >>> header(table)
        ['foo', 'bar']
    
    See also :func:`fieldnames`.
        
    """
    
    it = iter(table)
    return next(it)