code: def __str__(self):
      s = ""
      if self.backend:
          s += f"{self.backend}: "
      s += f"{self.elapsed}ms"
      if self.failed:
          s += " (failed!)"
      return s
  
file_path: matplotlib/tools/run_examples.py
imports: from argparse import ArgumentParser
  from contextlib import ExitStack
  import os
  from pathlib import Path
  import subprocess
  import sys
  from tempfile import TemporaryDirectory
  import time
  import tokenize
label_desc: Use image node_id 2 for calling the RunInfo obj's underlying member method code with example usage: obj.__str__() and returns: s