code: def __str__(self):
      classname = CLASS_NAME.get(self.op, self.op)
      return "(%s %s)" % (classname, self.arg)
  
file_path: catboost/contrib/python/cffi/py3/cffi/cffi_opcode.py
imports: from .error import VerificationError
label_desc: Use image node_id 4 for calling the CffiOp obj's underlying member method code with example usage: obj.__str__() and returns: unknown