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Coinflip

This example shows a conditional DAG path based on a “coinflip” from the flip task.

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from hera.workflows import DAG, Workflow, script


@script()
def flip():
    import random

    result = "heads" if random.randint(0, 1) == 0 else "tails"
    print(result)


@script()
def heads():
    print("it was heads")


@script()
def tails():
    print("it was tails")


with Workflow(generate_name="coinflip-", entrypoint="d") as w:
    with DAG(name="d") as s:
        f = flip()
        heads().on_other_result(f, "heads")
        tails().on_other_result(f, "tails")

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apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: coinflip-
spec:
  entrypoint: d
  templates:
  - name: d
    dag:
      tasks:
      - name: flip
        template: flip
      - name: heads
        depends: flip
        template: heads
        when: '{{tasks.flip.outputs.result}} == heads'
      - name: tails
        depends: flip
        template: tails
        when: '{{tasks.flip.outputs.result}} == tails'
  - name: flip
    script:
      image: python:3.10
      source: |-
        import os
        import sys
        sys.path.append(os.getcwd())
        import random
        result = 'heads' if random.randint(0, 1) == 0 else 'tails'
        print(result)
      command:
      - python
  - name: heads
    script:
      image: python:3.10
      source: |-
        import os
        import sys
        sys.path.append(os.getcwd())
        print('it was heads')
      command:
      - python
  - name: tails
    script:
      image: python:3.10
      source: |-
        import os
        import sys
        sys.path.append(os.getcwd())
        print('it was tails')
      command:
      - python

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