code: def __str__(self):
      return f"R{self.thingy}"
  
file_path: pytensor/tests/graph/test_types.py
imports: import pytest
  from pytensor.graph.basic import Variable
  from pytensor.graph.type import Type
label_desc: Use image node_id 4 for calling the MyType obj's underlying member method code with example usage: obj.__str__() and returns: str, self