economy_industries = [] accepted_by = self.industry_find_industries_active_in_economy_for_cargo(cargo, economy, 'accept_cargo_types') produced_by = self.industry_find_industries_active_in_economy_for_cargo(cargo, economy, 'prod_cargo_types') for industry in accepted_by: economy_industries.append(industry) for industry in produced_by: economy_industries.append(industry) accepted_by = self.industry_find_industries_active_in_economy_for_cargo(cargo, economy, 'accept_cargo_types') produced_by = self.industry_find_industries_active_in_economy_for_cargo(cargo, economy, 'prod_cargo_types') economy_industries = accepted_by + produced_by