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New Decorators Basic Script

This example shows a simple “hello world” script using the new decorators.

It uses a single input argument, which is passed through the Workflow. It also uses a plain Output - by setting the result value, it will be printed to stdout and be available to subsequent tasks (if it were in a DAG).

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from hera.shared import global_config
from hera.workflows import Input, Output, Workflow

global_config.experimental_features["decorator_syntax"] = True

w = Workflow(name="hello-world", arguments={"user": "me"})


class MyInput(Input):
    user: str


@w.set_entrypoint
@w.script()
def hello_world(my_input: MyInput) -> Output:
    output = Output()
    output.result = f"Hello Hera User: {my_input.user}!"
    return output

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apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  name: hello-world
spec:
  entrypoint: hello-world
  templates:
  - name: hello-world
    inputs:
      parameters:
      - name: user
    script:
      image: python:3.9
      source: '{{inputs.parameters}}'
      args:
      - -m
      - hera.workflows.runner
      - -e
      - examples.workflows.experimental.new_decorators_basic_script:hello_world
      command:
      - python
      env:
      - name: hera__outputs_directory
        value: /tmp/hera-outputs
      - name: hera__script_pydantic_io
        value: ''
  arguments:
    parameters:
    - name: user
      value: me

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