What’s the correct way to create resources when iterating over a List or Map that is provided as an Output? The Python docs for

Output::apply

say the following:

'func' is not allowed to make resources.

Not an definitive answer but I had the same question and did some DD on this and the consensus seems to be “avoid creating resources in apply if you can, but it is ok to do it if there is no alternative”

Yeah this is kind of a weird one. The best practice is to avoid creating resources in apply _as much as possible (_but it is sometimes unavoidable). FWIW, the advice to "not create resources in apply" is because of the fact that it may not be adequately captured in the

preview

(because some items in the output may not be known at preview time). If you can deal with the "may not have accurate preview" issue, then it's IMO fine to create resources within the apply. That being said, depending on if you know the length of your list or map, you can do things like

list_of_things: Output[List]

for i in range(3):
    resource = MyResource("my-resource", property=list_of_things.apply(lambda args: args[i])

Note: I am no longer an "official"

Pulumi folk

but I was until pretty recently.

In Python, I think there’s a slight problem with the above. The

lambda

will be invoked asynchronously and the value of

i

at that time will always be

2

good callout!

Thanks for your feedback. This is essentially the approach I had started using and was wondering if I’m on the right track. Much appreciated!