[FIXED] How to assign yield value to variable

Issue

I was trying to create a dynamic decorator function for both sync and async function and it is working fine, but I cannot use yield value further.

def retry(f) -> Any:
    @contextmanager
    def retry_context(*args):
        # response = False
        i = 0
        response_ok = False

        retries = DEFAULT_RETRIES
        status_retries = DEFAULT_STATUS_RETRIES

        retry_count = 0
        while i < retries and response_ok is False:
            retry_count = retry_count+1
            yield response
            i += 1
            if response.status_code not in status_retries:
                response_ok = True
                logger.debug("Response {}".format(response))
        if not response_ok:
            logger.warning("Response ERROR: {}".format(response))
        return response


    def wrapper(*args, **kwargs) -> Any:
        with retry_context(*args):
            return f(*args, **kwargs)

    async def async_wrapper(*args, **kwargs) -> Any:
        with retry_context(*args):
            return await f(*args, **kwargs)

    if asyncio.iscoroutinefunction(f):
        return async_wrapper
    return wrapper

I have seen many other answers for assigning value to yield but none is solving my issue, as I also want to use it further. Any other solution is also welcome.

Solution

The Context Manager protocol (i.e., the with statement ant its associated special methods and helper functions in the contextlib module), or "async context manager" as well, in this case - is not designed and cannot be made to work as a "retry" mechanism by itself.

That means: the context manager, either a generator decorated with the contextlib.contextmanager decorator, or a full-fledged class with an __enter__ and __exit__ methods will only, and can only by the way the language works, pass control to the body of the with statement a single time. For a contextmanager decorated generator, that means it must run a yield expression a single time in its lifetime.

You should either use an outer while loop with a differently designed class, or a ready-made retry library to achieve your goals there.

As for a nice 3rd party library implementing retries with a lot of options and care for edgecases, you can try "tenacity": https://github.com/jd/tenacity

Answered By - jsbueno