[[2021-06-17_Thu]] #argo
Argoは、withItemsでループできる。
```yaml
spec:
entrypoint: loop-example
templates:
- name: loop-example
steps:
- - name: print-message
template: whalesay
arguments:
parameters:
- name: message
value: "{{item}}"
withItems:
- hello world
- goodbye world
```
[argo-workflows/loops.yaml at master · argoproj/argo-workflows · GitHub](https://github.com/argoproj/argo-workflows/blob/master/examples/loops.yaml)
withItems以外にも似たような設定項目がある。
- withItems: stepを並列実行stepに分解
- withParam: JSON リストを渡す？
- withSequence: stepをnumeric sequenceへ
withSequenceの使い方は [argo-workflows/loops-sequence.yaml at master · argoproj/argo-workflows · GitHub](https://github.com/argoproj/argo-workflows/blob/master/examples/loops-sequence.yaml)
#### templateの出力をもとにループ
```yaml
templates:
- name: loop-param-result-example
steps:
- - name: generate
template: gen-number-list
# Iterate over the list of numbers generated by the generate step above
- - name: sleep
template: sleep-n-sec
arguments:
parameters:
- name: seconds
value: "{{item}}"
withParam: "{{steps.generate.outputs.result}}"
# Generate a list of numbers in JSON format
- name: gen-number-list
script:
image: python:alpine3.6
command: [python]
source: |
import json
import sys
json.dump([i for i in range(20, 31)], sys.stdout)
```