def get_template_sources(self, template_name, template_dirs=None):
        """
        Returns the absolute paths to "template_name", when appended to each
        directory in "template_dirs". Any paths that don't lie inside one of the
        template dirs are excluded from the result set, for security reasons.
        """
        if not template_dirs:
            template_dirs = app_template_dirs

        dirs = template_name.split('/')
        if len(dirs) >= 2 and dirs[0] == 'layouts':
            template_name = u'/'.join([dirs[1].replace('.html', ''), 'layout.html'])
            for template_dir in template_dirs:
                try:
                    yield safe_join(template_dir, template_name)
                except __HOLE__:
                    # The template dir name was a bytestring that wasn't valid UTF-8.
                    raise
                except ValueError:
                    # The joined path was located outside of template_dir.
                    pass
dataset/ETHPy150Open ionyse/ionyweb/ionyweb/loaders/layouts_templates.py/Loader.get_template_sources