What is the meaning of bind = True keyword in celery?

问题

What is the meaning of bind=True in below celery code? When to use it and when not?

@app.task(bind=True)
def send_twitter_status(self, oauth, tweet):
    try:
        twitter = Twitter(oauth)
        twitter.update_status(tweet)
    except (Twitter.FailWhaleError, Twitter.LoginError) as exc:
        raise self.retry(exc=exc)

回答1:

Just a small addition to other answers. As already stated, bound tasks have access to the task instance. One use case when this is needed are retries:

@celery.task(bind=True, max_retries=5)
def retrying(self):
    try:
        return 1/0
    except Exception:
        self.retry(countdown=5)

Another use case is when you want to define custom states for your tasks and be able to set it during task execution:

@celery.task(bind=True)
def show_progress(self, n):
    for i in range(n):
        self.update_state(state='PROGRESS', meta={'current': i, 'total': n})

回答2:

Bound tasks

A task being bound means the first argument to the task will always be the task instance (self), just like Python bound methods:

logger = get_task_logger(__name__)

@task(bind=True)
def add(self, x, y):
    logger.info(self.request.id)

回答3:

The bind argument means that the function will be a “bound method” so that you can access attributes and methods on the task type instance.

See the docs

来源：https://stackoverflow.com/questions/54899320/what-is-the-meaning-of-bind-true-keyword-in-celery