Django中类初始化方法在什么时候执行

class APIRequests(object):

    def __init__(self):
        import pdb;pdb.set_trace()
        request_session = requests.session()
        cookies = cache.get(settings.SSO_SESSION_COOKIES)
        if not cookies:
            request_session.post(settings.SSO_LOGIN_URL, json={
                "username": settings.SSO_USERNAME,
                "password": settings.SSO_PASSWORD
            })
            cookies = dict(request_session.cookies.items())
            cache.set(settings.SSO_SESSION_COOKIES, cookies, timeout=settings.SSO_TIME_OUT)
        self.cookies = cookies

    def get(self, *args, **kwargs):
        return requests.get(cookies=self.cookies, *args, **kwargs)

    def post(self, *args, **kwargs):
        return requests.get(cookies=self.cookies, *args, **kwargs)

    def patch(self, *args, **kwargs):
        return requests.patch(cookies=self.cookies, *args, **kwargs)

api_requests = APIRequests()

答案是：仅在application启动的时候初始化执行一遍，所以上面的代码不正确，当cookies过期后，不会再去重新获取新的cookies。