单独运行HTMLTestRunner，报错 #3
Description
self.passrate = str("%.2f%%" % (float(result.success_count) / float(result.success_count + result.failure_count + result.error_count) * 100))
{{ message }}
self.passrate = str("%.2f%%" % (float(result.success_count) / float(result.success_count + result.failure_count + result.error_count) * 100))