class_docstr: Adapt msg protocol v5 to v4
class_docstr_tok: ["Adapt","msg","protocol","v5","to","v4"]
docstr: Handle an execute request.
docstr_tok: ["Handle","an","execute","request","."]
code: def execute_request(self, msg: Dict[str, Any]) -> Dict[str, Any]:
      """Handle an execute request."""
      content = msg["content"]
      content.setdefault("user_variables", [])
      return msg
  
imports: import json
  import re
  from typing import Any, Dict, List, Tuple
  from ._version import protocol_version_info
label_desc: Use image node_id 3 for calling the V5toV4 obj's underlying member method code with example usage: obj.execute_request(msg) and returns: msg