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Passing Task Result

This example shows how to pass the result output parameter between tasks.

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from hera.workflows import DAG, Task, Workflow, script


@script()
def out():
    print(42)


@script()
def in_(a):
    print(a)


with Workflow(generate_name="script-param-passing-", entrypoint="d") as w:
    with DAG(name="d"):
        t1: Task = out()
        t2 = in_(arguments={"a": t1.result})
        t1 >> t2

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apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: script-param-passing-
spec:
  entrypoint: d
  templates:
  - name: d
    dag:
      tasks:
      - name: out
        template: out
      - name: in-
        depends: out
        template: in-
        arguments:
          parameters:
          - name: a
            value: '{{tasks.out.outputs.result}}'
  - name: out
    script:
      image: python:3.10
      source: |-
        import os
        import sys
        sys.path.append(os.getcwd())
        print(42)
      command:
      - python
  - name: in-
    inputs:
      parameters:
      - name: a
    script:
      image: python:3.10
      source: |-
        import os
        import sys
        sys.path.append(os.getcwd())
        import json
        try: a = json.loads(r'''{{inputs.parameters.a}}''')
        except: a = r'''{{inputs.parameters.a}}'''

        print(a)
      command:
      - python

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