How to use the rpg.utils.path_to_str function in rpg

def setUp(self):
        self._source_loader = SourceLoader()
        self._tar = None
        self._tar_dir = self.test_project_dir / "archives"
        self._tar_gz = self.test_project_dir / "archives" / "sample.tar.gz"
        self._tar_xz = self.test_project_dir / "archives" / "sample.tar.xz"
        self._tar_temp = Path("/var/tmp/rpg_test/")
        self._tar_extracted = self._tar_temp / "extracted"

        self._download = self._tar_temp / "download.tar.gz"

        if path.isdir(path_to_str(self._tar_temp)):
            rmtree(path_to_str(self._tar_temp))
        makedirs(path_to_str(self._tar_temp))
        makedirs(path_to_str(self._tar_extracted))

def md5Tar(self, t):
        mdsum = Command(
            "tar --list -f " + path_to_str(t) + " 2>/dev/null | "
            "awk -F/ '{ if($NF != \"\") print $NF }' | "
            r'sed -e "s/.*\///gm" | sort | md5sum'
        ).execute()
        self.assertNotEqual(self.FNF_MD5, mdsum)
        return mdsum

def tearDown(self):
        if self._tar:
            remove(path_to_str(self._tar))
        if path.isdir(path_to_str(self._tar_temp)):
            rmtree(path_to_str(self._tar_temp))

def setUp(self):
        self._source_loader = SourceLoader()
        self._tar = None
        self._tar_dir = self.test_project_dir / "archives"
        self._tar_gz = self.test_project_dir / "archives" / "sample.tar.gz"
        self._tar_xz = self.test_project_dir / "archives" / "sample.tar.xz"
        self._tar_temp = Path("/var/tmp/rpg_test/")
        self._tar_extracted = self._tar_temp / "extracted"

        self._download = self._tar_temp / "download.tar.gz"

        if path.isdir(path_to_str(self._tar_temp)):
            rmtree(path_to_str(self._tar_temp))
        makedirs(path_to_str(self._tar_temp))
        makedirs(path_to_str(self._tar_extracted))

def md5Dir(self, d):
        md5sum = Command(
            "find " + path_to_str(d) +
            r' -type f | sed -e "s/.*\///gm" | sort | md5sum'
        ).execute()
        self.assertNotEqual(self.FNF_MD5, md5sum)
        return md5sum

def create_archive(self):
        """ Creates archive (archvie_path) from Source folder """
        self.spec.Source = self.spec.Name + "-" + self.spec.Version + ".tar.gz"
        _tar = Command("tar zcf " + path_to_str(self.archive_path) +
                       " -C " + path_to_str(self.extracted_dir) +
                       " . --transform='s/^\./" +
                       self.spec.Name + "-" + self.spec.Version + "/g'")
        _tar.execute()
        logging.debug(str(_tar))

def create_archive(self):
        """ Creates archive (archvie_path) from Source folder """
        self.spec.Source = self.spec.Name + "-" + self.spec.Version + ".tar.gz"
        _tar = Command("tar zcf " + path_to_str(self.archive_path) +
                       " -C " + path_to_str(self.extracted_dir) +
                       " . --transform='s/^\./" +
                       self.spec.Name + "-" + self.spec.Version + "/g'")
        _tar.execute()
        logging.debug(str(_tar))

def _move_files(output, files):
        if not output.exists() and not output.is_dir():
            Command("mkdir " + path_to_str(output)).execute()
        for _out in files:
            try:
                Command("mv " + path_to_str(_out) +
                        " " + path_to_str(output)).execute()
            except:
                pass

def load_sources(self, source_path, extraction_dir):
        """ If source_path is a directory, path tree will be
            copied to extraction_dir. If it is archive
            May raise IOError """

        logging.debug('load_sources({}, {}) called'
                      .format(str(source_path), str(extraction_dir)))
        path = path_to_str(source_path)
        esc_extr_dir = path_to_str(extraction_dir)
        if isfile(path):
            compression = self._get_compression_method(path)
            if not compression:
                raise IOError("Input source archive '{}' is incompatible!"
                              .format(path))
            self._extract(path, esc_extr_dir, compression)
            self._process_dir(esc_extr_dir)
        elif isdir(str(source_path)):
            self._copy_dir(str(source_path), str(extraction_dir))
        else:
            raise IOError("Input source archive/directory '{}' doesn't exists!"
                          .format(path))