import random
import time
from collections import deque

from celery import Celery, Task
from celery.result import AsyncResult

app = Celery(__name__, broker="redis://", backend="redis://")


@app.task(bind=True)
def divide(self: Task, a: float, b: float) -> float:
    self.update_state(
        state="PROGRESS",
        meta={
            "step": "divide",
            "message": "Dividing numbers...",
            "info": {"a": a, "b": b},
        },
    )
    time.sleep(random.random() * 5)
    return a / b


if __name__ == "__main__":
    num_reqs = 10

    requests = [
        {"a": random.random() * 100, "b": random.random() * 100}
        for _ in range(num_reqs)
    ]
    ids: deque[str] = deque()

    print("Submitting requests...")
    for i, req in enumerate(requests):
        print(f"Request {i}: {req}")
        result: AsyncResult = divide.delay(**req)
        ids.append((i, result.id))

    # Polling the result in the queue
    while ids:
        idx, task_id = ids.popleft()
        result: AsyncResult = divide.AsyncResult(task_id)
        # Show the result if state is `SUCCESS`
        if result.state == "SUCCESS":
            result = result.get(task_id)
            print(f"Request {idx} is complete with result {result}")
        # Show the error if state is `FAILURE`
        elif result.state == "FAILURE":
            print(f"Request {idx} failed with error: {result.traceback}")
        # Show the progress if state is `PROGRESS`
        elif result.state == "PROGRESS":
            print(
                f"Request {idx} is in progress",
                f"{result.info['step']=}",
                f"{result.info['message']=}",
                f"{result.info['info']=}",
            )
            ids.append((idx, task_id))
        else:
            ids.append((idx, task_id))
    print("All requests are complete.")

Traceback (most recent call last):
  File "/main.py", line 54, in <module>
    f"{result.info['message']=}",
       ~~~~~~~~~~~^^^^^^^^^^^
TypeError: 'float' object is not subscriptable