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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_assembly_mapping_data(self, source_assembly, target_assembly):
 """ Get assembly mapping data. Parameters source_assembly : {'NCBI36', 'GRCh37', 'GRCh38'} assembly to remap from target_assembly : {'NCBI36', 'GRCh37', 'GRCh38'} assembly to remap to Returns ------- dict dict of json assembly mapping data if loading was successful, else None """

        return self._load_assembly_mapping_data(
            self._get_path_assembly_mapping_data(source_assembly, target_assembly)
        )