code: def __str__(self):
      if self.failure_point == "failure_point_str":
          raise ValueError("triggered_failure_point_str")
      return "FlakyException.__str__"
  
imports: import sys
  import pytest
  import env
  import pybind11_cross_module_tests
  import pybind11_tests
  from pybind11_tests import exceptions
label_desc: Use image node_id 2 for calling the FlakyException obj's underlying member method code with example usage: obj.__str__() and returns: str