code: def exist(name):
      '''
      Return True if the chroot environment is present.
      '''
      dev = os.path.join(name, 'dev')
      proc = os.path.join(name, 'proc')
      return all(os.path.isdir(i) for i in (name, dev, proc)f exist(name):
      '''
      Return True if the chroot environment is present.
      '''
      dev = os.path.join(name, 'dev')
      proc = os.path.join(name, 'proc')
      return all(os.path.isdir(i) for i in (name, dev, proc))
docs: Return True if the chroot environment is present.