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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_structures(self, chemsys_formula_id, final=True):
 """ 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. """

        prop = "final_structure" if final else "initial_structure"
        data = self.get_data(chemsys_formula_id, prop=prop)
        return [d[prop] for d in data]