code: def get_structures(self, chemsys_formula_id, final=True):
          
          prop = "final_structure" if final else "initial_structure"
          data = self.get_data(chemsys_formula_id, prop=prop)
          return [d[prop] for d in data]
docs: Get a list of Structures corresponding to a chemical system, formula,
          or materials_id.
  
          Args:
              chemsys_formula_id (str): A chemical system (e.g., Li-Fe-O),
                  or formula (e.g., Fe2O3) or materials_id (e.g., mp-1234).
              final (bool): Whether to get the final structure, or the initial
                  (pre-relaxation) structure. Defaults to True.
  
          Returns:
              List of Structure objects.