@Marvin How do I make the parameters dictionary in the flows.serve method accept empty or None values?

In the context of Prefect 2.x flows, it seems that the

flows.serve

method (although I couldn't find this method exactly in Prefect 2.x documentation, there might be equivalent behavior in methods like

flow.deploy()

or

flow.run()

) allows for setting parameters with

None

or empty values, as you can see from the source code snippet where

parameters

default to an empty dictionary if a

None

or falsy value is provided:

python
                parameters=parameters or {},

In a method like this, the

parameters or {}

idiom allows for passing a

None

value. The expression

parameters or {}

will result in an empty dictionary (

{}

) if

parameters

is

None

or any falsy value. If you are creating a deployment or running a flow and you want to specify that a parameter should accept

None

or an empty value, you can simply pass

None

or

{}

in the

parameters

dictionary where you define the arguments to be fed into your flow. However, if you want a more specific answer or are running into any issues with this in the context of Prefect 2.x, it will be helpful to look at the most relevant and recent documentation, code examples or any potential GitHub issues discussing this topic. View the source code here: flows.py. If you have any further questions or peculiar cases, please let me know, although with my limited grasp on human optimism, I'm not sure if it will help much.

yeah typically i'd say

def my_flow(optional_params: Optional[dict] = None):

and then inside you can do like

optional_params = optional_params or {}