human
Solve the following python programming problem given the following code:
def visit_Assign(self, node) : 
    def flatten_targets(tgt, lst) : 
        if isinstance (tgt, list) : 
            for x in tgt : 
                flatten_targets (x, lst) 
else : 
            if isinstance (tgt, (ast.Tuple, ast.List)) : 
                for x in tgt.elts : 
                    flatten_targets (x, lst) 
else : 
                if isinstance (tgt, (ast.Attribute, ast.Name, ast.Subscript)) : 
                    lst.append (tgt) 
else : 
                    from .. ast_helpers import print_simple_ast 
                    print_simple_ast (tgt) 
                    raise Exception ('Unsupported assignment type ({kind})!
Please notify the PyMTL developers!

 {lineno} {srccode}
 File: {filename}
 Function: {funcname}
 Line: {lineno}
'.format (attr = self.attr [0], kind = tgt.__class__, srccode = self.src [(node.lineno - 1)], filename = inspect.getfile (self.func), funcname = self.func.func_name, lineno = ((self.funclineno + node.lineno) - 1))) 
targets = [] 
    flatten_targets (node.targets, targets) 
    for lhs in targets : 
        if ((not isinstance (lhs, ast.Attribute)) or (node.attr not in self.attr)) : 
            try : 
                lhs = ReplaceIndexesWithZero ().visit (lhs) 
                lhs.ctx = ast.Load () 
                _code = compile (ast.Expression (lhs), '<ast>', 'eval') 
                _temp = eval (_code, self.dict_) 
except (NameError, AttributeError) as e : 
                _temp = None 
except IndexError as e : 
                _temp = None 
if isinstance (_temp, Signal) : 
                raise PyMTLError ('Attempting to write a(n) {kind} without .{attr}!

 {lineno} {srccode}
 File: {filename}
 Function: {funcname}
 Line: {lineno}
'.format (attr = self.attr [0], kind = _temp.__class__.__name__, srccode = self.src [(node.lineno - 1)], filename = inspect.getfile (self.func), funcname = self.func.func_name, lineno = ((self.funclineno + node.lineno) - 1))) 

    
    

    Fix the buggy line: if ((not isinstance (lhs, ast.Attribute)) or (node.attr not in self.attr)) :
assistant
#Here is Python program to fix the buggy line: if ((not isinstance (lhs, ast.

if ((not isinstance (lhs, ast.Attribute)) or (lhs.attr not in self.attr)) :