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How to call Prefect Python APIs within Prefect Orion? Also, how to call Prefect Orion Python APIs from a Java application? Do we have any tutorial or doc for both cases?

Are you talking about using the “flow development” APIs like `@flow` and `@task` or the orchestration API via HTTP?

Especially I would like to deploy ABC.py which has flows, subflows and tasks, via Python Orion REST API. I don't see flow_location attribute in the Orion API doc. I am not sure how to pass the ABC.py and deploy the workflow.

If I only send the name, how do API know which python file to use and deploy?

The `DeploymentSpec` expands a `flow_location` into the `flow_data` document e.g. `{"encoding": "file", "blob": b"/path/to/ABC.py"}`

The python API contains conveniences to construct the objects the orchestration API requires