Skip to content

Default Param Overwrite

This example showcases how a Python source can be scheduled with default parameters as kwargs but overwritten conditionally.

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
from hera.workflows import DAG, Workflow, script


@script()
def generator():
    print("Another message for the world!")


@script()
def consumer(message: str = "Hello, world!"):
    print(message)


with Workflow(generate_name="default-param-overwrite-", entrypoint="d") as w:
    with DAG(name="d"):
        g = generator()
        c_default = consumer(name="consumer-default")
        c_param = consumer(name="consumer-param", arguments=g.get_result_as("message"))
        g >> [c_default, c_param]

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: default-param-overwrite-
spec:
  entrypoint: d
  templates:
  - name: d
    dag:
      tasks:
      - name: generator
        template: generator
      - name: consumer-default
        depends: generator
        template: consumer
      - name: consumer-param
        depends: generator
        template: consumer
        arguments:
          parameters:
          - name: message
            value: '{{tasks.generator.outputs.result}}'
  - name: generator
    script:
      image: python:3.9
      source: |-
        import os
        import sys
        sys.path.append(os.getcwd())
        print('Another message for the world!')
      command:
      - python
  - name: consumer
    inputs:
      parameters:
      - name: message
        default: Hello, world!
    script:
      image: python:3.9
      source: |-
        import os
        import sys
        sys.path.append(os.getcwd())
        import json
        try: message = json.loads(r'''{{inputs.parameters.message}}''')
        except: message = r'''{{inputs.parameters.message}}'''

        print(message)
      command:
      - python

Comments