code: def region_for(self, location: str) -> str:
      # location = zone
      return region_from_location(location)
  
file_path: hail/batch/batch/cloud/gcp/instance_config.py
imports: from typing import List, Union
  from ...driver.billing_manager import ProductVersions
  from ...instance_config import InstanceConfig
  from .resource_utils import gcp_machine_type_to_parts, machine_family_to_gpu
  from .resources import GCPAcceleratorResource, GCPComputeResource, GCPDynamicSizedDiskResource, GCPIPFeeResource, GCPLocalSSDStaticSizedDiskResource, GCPMemoryResource, GCPResource, GCPServiceFeeResource, GCPStaticSizedDiskResource, GCPSupportLogsSpecsAndFirewallFees, gcp_resource_from_dict
label_desc: Use image node_id 4 for calling the GCPSlimInstanceConfig obj's underlying member method code with example usage: obj.region_for(location) and returns: region_from_location