code: def leave_OperationTypeDefinition(self, node, *args):
      return "{}: {}".format(node.operation, node.type)
  
imports: import json
  from .visitor import Visitor, visit
label_desc: Use image node_id 25 for calling the PrintingVisitor obj's underlying member method code with example usage: obj.leave_OperationTypeDefinition(node) and returns: str