def __init__(self, template_name, attr=None):
        for template_dir in settings.TEMPLATE_DIRS:
            if os.path.exists(os.path.join(template_dir, template_name) + ".mustache"):
                break
        else:
            raise IOError((template_name, str(settings.TEMPLATE_DIRS)) % "failed to find %s in %s")

        self.template_path = template_dir
        self.template = template_name
        self.attr = attr
dataset/ETHPy150Open open-cloud/xos/xos/core/xoslib/templatetags/mustache.py/MustacheNode.__init__/swapped operands of `%`