In Prefect 3.x, the

load_flow_from_script

function has been replaced with a more streamlined approach using the

from_source()

method. Instead of loading a flow directly from a script, you'll want to use the following pattern:

python
from prefect import flow

# Deploy a flow from a local script
flow.from_source(
    source="path/to/your/script.py",
    entrypoint="script.py:flow_function_name"
).deploy(name="your-deployment-name")

This new approach is part of Prefect 3.x's broader redesign that emphasizes more robust deployment mechanisms and better integration with modern infrastructure patterns. The

from_source()

method is more flexible and can handle both local scripts and remote sources. For example, if you previously had:

python
# Prefect 2.x (old way)
from prefect.utilities.load import load_flow_from_script
flow = load_flow_from_script(path="path/to/script.py", flow_name="my_flow")

You would now use:

python
# Prefect 3.x (new way)
from prefect import flow
deployment = flow.from_source(
    source="path/to/script.py",
    entrypoint="script.py:my_flow"
).deploy(name="my-deployment")

This change aligns with Prefect 3.x's shift toward work pools and workers (replacing the older agent-based system) and provides a more consistent way to handle flow deployments.