code: def _public_key(self):
      if not self.public_key:
          return None
      maybe_path = remote_util.config_path(self.public_key)
      if os.path.exists(maybe_path):
          return open(maybe_path, "r").read()
      return self.public_key
  
imports: import json
  import logging
  import os
  import re
  import subprocess
  import sys
  from guild import remote
  from guild import remote_util
  from guild import util
  from guild import var
  from .None import ssh
  from .None import ssh_util
label_desc: Use image node_id 20 for calling the EC2Remote obj's underlying member method code with example usage: obj._public_key() and returns: self, None, open