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Hey! Welcome! You can use

ec2.get_subnet_ids

for this, here's a hastily thrown together example

import pulumi
from pulumi_aws import ec2

# get the default vpc
vpc = ec2.get_vpc(default=True)

# get subnets associated with the default vpc
subnets = ec2.get_subnet_ids(vpc_id=vpc.id)

export the subnet ids associated
pulumi.export("subnets", subnets.ids)

Thanks Jaxxstrom. I want to run through all the VPCs so I will try without the default. But if the subnet exists can we quit the pulumi build or is that not best practice. I am struggling to find how to implement IaC based on certain criteria or do they have to be immutable(as best practice). The reason being, I will be deploying my service over a shared infra supported by another team.

sorry for the delay! ideally in this situation, if your VPC doesn't exist, you should create it. In this case, you probably want to filter the VPCs based on something like the tags assigned to it.

no worries on the delay Jaxxstorm.Many thanks for the help. So does the ec2.getvpc return only a single VPC? I wanted to run through all the VPC..I understand that I will have to get a tag assigned to my project.

You can use

get_vpcs

to get all the VPCs in an account and loop through them https://www.pulumi.com/docs/reference/pkg/python/pulumi_aws/ec2/#pulumi_aws.ec2.get_vpcs