code: def search_meta_specific(self, **avargs):
          
          
          qry = self.ses.query(Symbol).join(SymbolMeta.symbol)
  
  
          for attr, value in avargs.iteritems():
              SMA = aliased(SymbolMeta)
              if "%" in value:
                  acrit = SMA.value.like(value)
              else:
                  acrit = SMA.value == value
              
              crit = and_(acrit, SMA.attr == attr)
  
              qry = qry.filter(crit).join(SMA, SMA.symname == SymbolMeta.symname)
  
          qry = qry.order_by(Symbol.name)
          return qry.all()
docs: Search list of Symbol objects by by querying specific 
          meta attributes and their respective values.
          
          Parameters
          ----------
          avargs
              The attributes and values passed as key word arguments.
              If more than one criteria is specified, AND logic is applied.
              Appending '%' to values will use SQL's "LIKE" functionality.
          
          Example
          -------
          >>> sm.search_meta(geography='Canada', sector='Gov%')
              
          Returns
          -------
          List of Symbols or empty list