code: def set_public_lan(lan_id):
      '''
      Enables public Internet access for the specified public_lan. If no public
      LAN is available, then a new public LAN is created.
      '''
      conn = get_conn()
      datacenter_id = get_datacenter_id()
  
      try:
          lan = conn.get_lan(datacenter_id=datacenter_id, lan_id=lan_id)
          if not lan['properties']['public']:
              conn.update_lan(datacenter_id=datacenter_id,
                              lan_id=lan_id,
                              public=True)
          return lan['id']
      except Exception:
          lan = conn.create_lan(datacenter_id,
                                LAN(public=True,
                                    name='Public LAN'))
          return lan['id'f set_public_lan(lan_id):
      '''
      Enables public Internet access for the specified public_lan. If no public
      LAN is available, then a new public LAN is created.
      '''
      conn = get_conn()
      datacenter_id = get_datacenter_id()
  
      try:
          lan = conn.get_lan(datacenter_id=datacenter_id, lan_id=lan_id)
          if not lan['properties']['public']:
              conn.update_lan(datacenter_id=datacenter_id,
                              lan_id=lan_id,
                              public=True)
          return lan['id']
      except Exception:
          lan = conn.create_lan(datacenter_id,
                                LAN(public=True,
                                    name='Public LAN'))
          return lan['id']
docs: Enables public Internet access for the specified public_lan. If no public
      LAN is available, then a new public LAN is created.