human
Solve the following python programming problem given the following code:
def _getTransitiveDepClosure(self, targets = None) : 
    def isTroveTarget(trove) : 
        if (targets is None) : 
            return True 
return (trove.getName () in targets) 
db = database.Database (self.cfg.root, self.cfg.dbPath) 
    reqList = [req for req in self.getBuildRequirementTroves (db) if isTroveTarget (req)] 
    reqNames = set ((req.getName () for req in reqList)) 
    depSetList = [req.getRequires () for req in reqList] 
    d = db.getTransitiveProvidesClosure (depSetList) 
    for depSet in d : 
        reqNames.update (set ((depSet [0] for troveTup in d [depSet]))) 
return reqNames 

    
    

    Fix the buggy line: reqNames.update (set ((depSet [0] for troveTup in d [depSet])))
assistant
#Here is Python code to fix the buggy line: reqNames.

reqNames.update (set ((troveTup [0] for troveTup in d [depSet])))