def isVariableDefined(self, varID):
        
        for i in range(self.varList.count()):
            item = self.varList.item(i)
            if varID == item.getVariable().id and not item.isQuickplotItem():
                return True
        return False
Return true if a variable with the given id is defined (this does
dataset/ETHPy150Open VisTrails/VisTrails/contrib/cdat/cdat_window.py/QDefinedVariable.isVariableDefined