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Your pulumi program is trying to pass a

TextIOWrapper

to something that's probably expecting a

str

. I'd check what parameters your passing in the resource constructors

thanks, that's right, turns out the problem was that i was passing this as the policy argument to the s3.Bucket constructor:

(lambda path: open(path))('policy.json')

when it should have been

(lambda path: open(path).read())('policy.json')