code: def clean_frontend_build(self):
      log.info("Removing previous JS nbextension files")
      for filepath in self.target_files:
          try:
              os.remove(filepath)
          except Exception:
              log.info("No file %s, not removing" % filepath)
  
imports: from __future__ import print_function
  from distutils.command.install import install
  from setuptools import setup, find_packages, Command
  from setuptools.command.sdist import sdist
  from setuptools.command.build_py import build_py
  from setuptools.command.egg_info import egg_info
  from setuptools.command.develop import develop
  import atexit
  from distutils import log
  import os
  from shutil import copy
  from subprocess import check_call, check_output
  import sys
label_desc: Use image node_id 3 for calling the FrontendBuild obj's underlying member method code with example usage: obj.clean_frontend_build() without return types