old_contents: from __future__ import absolute_import
  from __future__ import unicode_literals
  
  from .sshfs import SSHFS
  
new_contents: from __future__ import absolute_import
  from __future__ import unicode_literals
  
  from .sshfs import SSHFS
  
  from ..opener import Opener, registry
  
  
  @registry.install
  class SSHOpener(Opener):
      protocols = ['ssh']
  
      def open_fs(self, fs_url, parse_result, writeable, create, cwd):
          #from .sshfs import SSHFS
          ssh_host, _, dir_path = parse_result.resource.partition('/')
          ssh_host, _, ftp_port = ssh_host.partition(':')
          ssh_port = int(ftp_port) if ftp_port.isdigit() else 22
          ssh_fs = SSHFS(
              ssh_host,
              port=ssh_port,
              user=parse_result.username,
              passwd=parse_result.password,
          )
          return ssh_fs.opendir(dir_path) if dir_path else ssh_fs
  
subject: Add fs Opener based on the builtin FTPFS opener