code: def trace_python(
      self, script_file, python_file, optimize_python=None
  ):
      python_flags = []
      if optimize_python:
          python_flags.extend(["-O"] * optimize_python)
      subcommand = " ".join(
          [sys.executable] + python_flags + [python_file]
      )
      return self.trace(script_file, subcommand)
  
imports: import dis
  import os.path
  import re
  import subprocess
  import sys
  import sysconfig
  import types
  import unittest
  from test import support
  from test.support import findfile
label_desc: Use image node_id 4 for calling the TraceBackend obj's underlying member method code with example usage: obj.trace_python(script_file, python_file, optimize_python) and returns: self