How to use the fasteners._utils function in fasteners

def _do_open(self):
        basedir = os.path.dirname(self.path)
        if basedir:
            made_basedir = _ensure_tree(basedir)
            if made_basedir:
                self.logger.log(_utils.BLATHER,
                                'Created lock base path `%s`', basedir)
        # Open in append mode so we don't overwrite any potential contents of
        # the target file. This eliminates the possibility of an attacker
        # creating a symlink to an important file in our lock path.
        if self.lockfile is None or self.lockfile.closed:
            self.lockfile = open(self.path, 'a')