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# aws
s
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c
"“”An AWS Python Pulumi program”“” You can do something like the following:
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"""An AWS Python Pulumi program"""

import pulumi
import pulumi_aws as aws

# Create an AWS resource (S3 Bucket)
awsConfig = pulumi.Config("aws")
awsRegion = awsConfig.get("region")


if  awsRegion != "us-east-2":
  raise ValueError("provider has bad region")

pulumi.export("aws_region_selected", awsRegion)
Here are the aws provider inputs You can test it out by changing the region to and then it will throw the error: 
pulumi config set aws:region us-east-1
If you set it back to 
pulumi config set aws:region us-east-2
- no error will be thrown.
g
that's evaluating values of the config not the actual provider
r
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def validate_region(region):
    if region != "wanted region":
        raise ValueError("provider has bad region")

provider.region.apply(validate_region)
Oh wait… the default provider. I’m not sure you can get the default provider (but it uses the default region declared in your config so what @cool-fireman-90027 wrote will get you the same information). If you need to do something with the provider you should explicitly declare a provider resource in your code. But as far as your question about how to validate outputs, the code I wrote should be applicable for all outputs.
g
okay thank you, it seems it's also limited to apply scope again 😞 about default provider - since the best practice is to declare your provider directly, would be better to disable default providers entirely? I noticed in some threads here people having problems when migrating away from default provider to declared one
r
Yes, the resolved value of an 
Output
is only available within an apply. That is the pulumi programming model. Re: disabling default providers is tracked in this issue - feel free to upvote or comment with your input.
g
Oh that's great to hear! Thank you!
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