python:如何在yaml文件中添加新键和值 [英] python: how to add a new key and a value in yaml file

问题描述

我有以下 YAML 文件.我需要使用 python 使用新的键值对更新 YAML 文件.

I have the following YAML file. I need to update the YAML file with a new key-value pair using python.

我正在执行以下操作，但它给了我错误:

I am doing the following but, it gives me error:

pod = mylib.load_yaml("net/pod.yaml")
pod['spec']['nodeSelector']['key']='val'

它给出错误说 KeyError:'nodeSelector'

spec:
  containers:
  - image: ceridwen/networking:v1
    imagePullPolicy: Always
    name: networking
    readinessProbe:
      tcpSocket:
        port: 5000
      initialDelaySeconds: 5
      periodSeconds: 1
    restartPolicy: Always

我需要用新的键值更新它

I need to update it with a new key value

spec:
  containers:
  - image: ceridwen/networking:v1
    imagePullPolicy: Always
    name: networking
    readinessProbe:
      tcpSocket:
        port: 5000
      initialDelaySeconds: 5
      periodSeconds: 1
    restartPolicy: Always
  nodeSelector:
    key: value 

推荐答案

一旦你加载了那个 YAML 文件，你的 pod 就是一个带有单键 spec 的字典.您可以检查该键的值 (print(pod['spec'])，您将看到这是 dict，只有一个键 containers.由于您想要添加一个额外的键 nodeSelector 到那个 dict 你应该添加到 pod['spec']:

Once you load that YAML file, your pod is a dict with a single key spec. You can check the value for that key (print(pod['spec']) and you'll see that that is dict, with a single key containers. Since you want add an extra key nodeSelector to that dict you should add to pod['spec']:

pod['spec']['nodeSelector'] = dict(key='value')

请注意输出中的 key:value(: 后没有空格，key 和 后没有引号)code>value)，不是映射而是单个标量字符串.

Please note that the key:value you had in your output (without a space after the : and without quotes around key and value), is not a mapping but a single scalar string.

@zwer 在评论中给出的解决方案":

The "solution" given by @zwer in his comment:

pod["spec"] = {"nodeSelector": {"key": "val"}}不正确，因为它会转储为:

pod["spec"] = {"nodeSelector": {"key": "val"}} is incorrect, as it will dump as:

spec:
  nodeSelector:
    key: val

即替换 spec 的值，从而使用键 containers 删除现有的字典/映射.

i.e. replacing the value for spec and thereby deleting the existing dict/mapping with the key containers.

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