code: def get_assembly_mapping_data(self, source_assembly, target_assembly):
          
          return self._load_assembly_mapping_data(
              self._get_path_assembly_mapping_data(source_assembly, target_assembly)
          )
docs: 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