``` if foo in outputs TypeError argument of type Output is n

Question

``` if foo in outputs TypeError argument of type Output is not iterable```

billowy-army-68599 · Answer

you are running into the async nature of outputs Outputs aren t iterable because they haven t resolved yet You need to do the check inside an `apply` ```stack reference output apply lambda i if i do something```

little-book-13693 · Answer

Ok thanks can i not extract the list of outputs that are currently there

billowy-army-68599 · Answer

can you elaborate what you mean by extract

little-book-13693 · Answer

sure so this works

little-book-13693 · Answer

```outputs = stack reference outputs apply lambda outputs output for output in outputs pulumi export outputs outputs ```

little-book-13693 · Answer

it displays the list of output keys

little-book-13693 · Answer

I would now like to check if a key exists in this list

little-book-13693 · Answer

like would this work ```def stack contains output stack reference output name return outputs apply lambda outputs True if output name in outputs else False ```

billowy-army-68599 · Answer

yes basically if you re inside the `apply` you can treat the object like a standard object because it s now resolved so you can check however you d like

little-book-13693 · Answer

Oh nice yeh it works thank you

billowy-army-68599 · Answer

this might help with some additional context <https leebriggs co uk blog 2021 05 09 pulumi apply>

little-book-13693 · Answer

thanks