code: def get_spec_machine_spec(self, spec):
      if self.format_version < 5:
          return None
      machine_type_spec = spec[4]
      if machine_type_spec:
          return {
              "machine_type": machine_type_spec[0],
              "preemptible": bool(machine_type_spec[1]),
              "storage_gib": machine_type_spec[2],
          }
      return None
  
file_path: hail/batch/batch/batch_format_version.py
imports: from typing import Optional, Tuple
  from hailtop.batch_client.aioclient import Job
label_desc: Use image node_id 11 for calling the BatchFormatVersion obj's underlying member method code with example usage: obj.get_spec_machine_spec(spec) and returns: None, None, dict