code: def __getitem__(self, key: int):
      if not isinstance(key, int):
          raise SyftException(f"Key: {key} must be an integer")
  
      nodes = self.retrieve_nodes()
  
      if key >= len(nodes):
          raise SyftException(
              f"Index {key} out of range for retrieved nodes"
          )
  
      return self.routing_client.proxy_to(nodes[key])
  
imports: from typing import Any
  from typing import List
  from typing import Optional
  from typing import Union
  from typing_extensions import Self
  from ..abstract_node import NodeSideType
  from ..abstract_node import NodeType
  from ..img.base64 import base64read
  from ..node.credentials import SyftSigningKey
  from ..serde.serializable import serializable
  from ..service.network.node_peer import NodePeer
  from ..service.response import SyftError
  from ..service.response import SyftException
  from ..types.syft_object import SYFT_OBJECT_VERSION_1
  from ..types.syft_object import SyftObject
  from ..util.fonts import fonts_css
  from .client import SyftClient
label_desc: Use image node_id 4 for calling the ProxyClient obj's underlying member method code with example usage: obj.__getitem__(key) and returns: self