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Script With Default Params

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from hera.workflows import DAG, Workflow, script


@script()
def foo(a, b=42, c=None):
    print(a, b, c)


with Workflow(generate_name="script-default-params-", entrypoint="d") as w:
    with DAG(name="d"):
        foo(name="b-unset-c-unset", arguments={"a": 1})
        foo(name="b-set-c-unset", arguments={"a": 1, "b": 2})
        foo(name="b-unset-c-set", arguments={"a": 1, "c": 2})
        foo(name="b-set-c-set", arguments={"a": 1, "b": 2, "c": 3})

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apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: script-default-params-
spec:
  entrypoint: d
  templates:
  - dag:
      tasks:
      - arguments:
          parameters:
          - name: a
            value: '1'
        name: b-unset-c-unset
        template: foo
      - arguments:
          parameters:
          - name: a
            value: '1'
          - name: b
            value: '2'
        name: b-set-c-unset
        template: foo
      - arguments:
          parameters:
          - name: a
            value: '1'
          - name: c
            value: '2'
        name: b-unset-c-set
        template: foo
      - arguments:
          parameters:
          - name: a
            value: '1'
          - name: b
            value: '2'
          - name: c
            value: '3'
        name: b-set-c-set
        template: foo
    name: d
  - inputs:
      parameters:
      - name: a
      - default: '42'
        name: b
      - default: 'null'
        name: c
    name: foo
    script:
      command:
      - python
      image: python:3.8
      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}}'''
        try: b = json.loads(r'''{{inputs.parameters.b}}''')
        except: b = r'''{{inputs.parameters.b}}'''
        try: c = json.loads(r'''{{inputs.parameters.c}}''')
        except: c = r'''{{inputs.parameters.c}}'''

        print(a, b, c)

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