human
Solve the following python programming problem given the following code:
def group_comparison(tlist) : 
    def _parts_valid(token) : 
        return ((token.ttype in (T.String.Symbol, T.Name, T.Number, T.Number.Integer, T.Literal, T.Literal.Number.Integer)) or isinstance (token, (sql.Identifier, sql.Parenthesis)) or ((token.ttype is T.Keyword) and (token.value.upper () in ['NULL']))) 
_group_left_right (_parts_valid, T.Operator.Comparison, None, sql.Comparison, check_left = _parts_valid, check_right = _parts_valid) 

    
    

    Fix the buggy line: _group_left_right (_parts_valid, T.Operator.Comparison, None, sql.Comparison, check_left = _parts_valid, check_right = _parts_valid)
assistant
#Here is Python code to fix the buggy line: _group_left_right (_parts_valid, T.

_group_left_right (tlist, T.Operator.Comparison, None, sql.Comparison, check_left = _parts_valid, check_right = _parts_valid)