yaml 中的嵌套列表

问题描述

如何在 YAML 中创建嵌套列表?我想得到:

How can I create nested lists in YAML? I want to get:

 {"Hello": ["as", ["http://", ["cat"]]]}

这是我的 YAML 不起作用(使用 pyYaml):

Here's my YAML that doesn't work (with pyYaml):

  Hello:
    - "as"
      - "http://"
        - cat

我做错了什么?

具体来说，我正在尝试从 YAML 生成以下 JSON:

Specifically, I'm trying to generate the following JSON from YAML:

"URL" : {
  "Description" : "URL of the website",
  "Value" :  { "Fn::Join" : [ "", [ "http://", { "Fn::GetAtt" : [ "ElasticLoadBalancer", "DNSName" ]}]]}
}

这是我使用过的最接近的 YAML，但它不能完全满足我的需求.

Here's the closest YAML I've got working, but it doesn't give quite what I need.

YAML 是:

  Outputs:
    URL:
      Description: URL of the website
      Value:
        "Fn::Join":
        - ""
        - "http://"
        - "Fn::GetAtt":
          - ElasticLoadBalancer
          - DNSName

结果:

    "URL": {
        "Description": "URL of the website", 
        "Value": {
            "Fn::Join": [
                "", 
                "http://", 
                {
                    "Fn::GetAtt": [
                        "ElasticLoadBalancer", 
                        "DNSName"
                    ]
                }
            ]
        }
    }

这几乎是正确的，但是在 "" 之后应该有一个嵌套列表，而不仅仅是另一个列表项.我该如何解决这个问题?

This is almost correct, but after "" there should be a nested list, not just another list item. How can I fix this?

这将被送入 API，因此输出必须完全匹配.

This is going to be fed into an API, so the output must match completely.

推荐答案

答案是:

URL:
  Description: URL of the website
  Value:
    "Fn::Join":
      - ""
      - - "http://"
        - "Fn::GetAtt":
            - ElasticLoadBalancer
            - DNSName

(见 http://pyyaml.org/wiki/PyYAMLDocumentation#YAMLsyntax - "block序列可以嵌套")

(see http://pyyaml.org/wiki/PyYAMLDocumentation#YAMLsyntax - "block sequences can be nested")

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