Flyte enables production-grade orchestration for machine learning workflows and data processing created to accelerate local workflows to production.

Flyte

Hi team, wondering if it's possible to write a for loop in workflow and run tasks? the parameter changes in each loop, i got some type error like: argument 1 must be str, not Promise

```@workflow()
def backfill(end_of_end_date: str = None, start_of_start_date: str=None, look_back: str = None) -&gt; int:
    end_date = datetime.strptime(end_of_end_date, "%Y-%m-%d")
    start_date = datetime.strptime(start_of_start_date, "%Y-%m-%d")
    while start_date &gt;= datetime.strptime(start_of_start_date, "%Y-%m-%d"):

        main(end_date=end_date.strftime("%Y-%m-%d"), look_back=look_back)
        end_date -= timedelta(days=1)
        start_date -= timedelta(days=1)

    return 0```

If you want to change the parameter of hen you have to use recursion in dynamic 

But we have something interesting that might help

also I'm curious if you have example of the recursion