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I not sure how Pulumi handle this case, I did my trick by convert `program_subnet.py` into Class and create a function like `vpc_subnet(vpc_id,cidr)`then at program_vpc.py just import this class and call function after vpc create

other way is using
```pulumi.export("vpc1_id", vpc1.id)
pulumi.export("vpc2_id", vpc2.id)```
as array export, so in next python file you can refer value without write so many export line