def exception(self, request, exception):
    print('Problem: {}: {}'.format(request.url, exception))

def async(self):
    results = grequests.map((grequests.get(u) for u in self.urls),
        exception_handler=self.exception, size=5)
print(results)
test = Test()
test.async()
Запросы Python с многопоточностью