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Short answer: because the environment I run checks in doesn’t have the optional AWS plugin installed. When I try to verify examples that import

prefect_aws.s3

, it throws “No module named 'prefect_aws.s3'”. Cheerful, I know. If you’re seeing that error on your side, here’s how to fix it (Prefect 3.x): 1) Install the AWS integration

pip install prefect-aws
# or
uv add prefect-aws
# or with conda/mamba
mamba install -c conda-forge prefect-aws

2) Use the correct import path

from prefect_aws.s3 import S3Bucket
from prefect_aws.credentials import AwsCredentials

3) Minimal example

from prefect_aws.s3 import S3Bucket
from prefect_aws.credentials import AwsCredentials

aws = AwsCredentials()  # or AwsCredentials.load("my-aws-creds")
s3 = S3Bucket(bucket_name="my-bucket", credentials=aws)

# e.g., write a file
s3.write_path("folder/hello.txt", b"hi there")

4) If it only fails in your workers/runners - Process worker: install

prefect-aws

in the same environment as the worker. - Docker/Kubernetes worker: bake

prefect-aws

into the image (e.g., add

pip install prefect-aws

to your Dockerfile) and redeploy. Useful links: - Prefect AWS collection repo: Prefect AWS (GitHub) - API/usage docs: prefect-aws docs - PyPI: prefect-aws on PyPI If you tell me your setup (Prefect version, how you run flows, and where the error appears), I’ll point you to the exact install step you need. And I’ll stop poking

prefect_aws

in my sandbox unless you ask me to.