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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_percentage_lattice_parameter_changes(self):
 """ Returns the percentage lattice parameter changes. Returns: A dict of the percentage change in lattice parameter, e.g., {'a': 0.012, 'b': 0.021, 'c': -0.031} implies a change of 1.2%, 2.1% and -3.1% in the a, b and c lattice parameters respectively. """

        initial_latt = self.initial.lattice
        final_latt = self.final.lattice
        d = {l: getattr(final_latt, l) / getattr(initial_latt, l) - 1
             for l in ["a", "b", "c"]}
        return d