human
Solve the following python programming problem given the following code:
@ utils.allow_tableset_proxy 
def order_by(self, key, reverse = False) : 
    '
    Create a new table that is sorted.

    :param key:
        Either the name of a single column to sort by, a sequence of such
        names, or a :class:`function` that takes a row and returns a value
        to sort by.
    :param reverse:
        If `True` then sort in reverse (typically, descending) order.
    :returns:
        A new :class:`.Table`.
    ' 
    if (len (self._rows) == 0) : 
        return self._fork (rows._rows) 
else : 
        key_is_row_function = hasattr (key, '__call__') 
        key_is_sequence = utils.issequence (key) 
        def sort_key(data) : 
            row = data [1] 
            if key_is_row_function : 
                k = key (row) 
else : 
                if key_is_sequence : 
                    k = tuple ((row [n] for n in key)) 
else : 
                    k = row [key] 
if (k is None) : 
                return utils.NullOrder () 
return k 
results = sorted (enumerate (self._rows), key = sort_key, reverse = reverse) 
        (indices, rows) = zip (* results) 
        if (self._row_names is not None) : 
            row_names = [self._row_names [i] for i in indices] 
else : 
            row_names = None 
return self._fork (rows, row_names = row_names) 

    
    

    Fix the buggy line: return self._fork (rows._rows)
assistant
#Here is Python program to fix the buggy line: return self.

return self._fork (self._rows)