Pyyaml：修改aws-auth-cm.yaml，保留多行字符串

问题描述

我正在尝试用python加载一个YAML文件，对其进行修改并将其转储回来。 YAML如下所示：

data:
  mapRoles: |
    - username: system:node:{{EC2PrivateDNSName}}
      groups:
      - system:bootstrappers
      - system:nodes
kind: ConfigMap
metadata:
  name: aws-auth
  namespace: kube-system

我要修改它，以便输出文件在mapRoles：

data:
  mapRoles: |
    - username: system:node:{{EC2PrivateDNSName}}
      groups:
        - system:bootstrappers
        - system:nodes
      rolearn: awsarn
kind: ConfigMap
metadata:
  name: aws-auth
  namespace: kube-system

但是我得到一个输出，其中mapRoles值像字符串一样被引用，并且包括文字 ：

apiVersion: v1
data:
  mapRoles: "- username: system:node:{{EC2PrivateDNSName}}
  groups:
    - system:bootstrappers

        - system:nodes
  rolearn: arnaws"
kind: ConfigMap
metadata:
  name: aws-auth
  namespace: kube-system

我使用的代码：

with open ('/tmp/aws-auth-cm.yaml') as f:
  content = yaml.safe_load(f)
  content['data']['mapRoles'] = content['data']['mapRoles'] + '  rolearn: awsarn' 
with open("/tmp/aws-auth-cm.yaml", "w") as f:
  yaml.safe_dump(content, f, default_flow_style=False)

我还尝试使用yaml.safe_dump(content, f, default_flow_style=False, default_style='|')，然后所有值都有|-，键用双引号引起来：

"apiVersion": |-
  v1
"data":
  "mapRoles": |-
    - username: system:node:{{EC2PrivateDNSName}}
      groups:
        - system:bootstrappers
        - system:nodes
      rolearn: arnaws
"kind": |-
  ConfigMap
"metadata":
  "name": |

是否可以将style=‘|’仅应用于字符串，并确保键不带引号？

PyYAML

您可以尝试使用推荐答案执行此操作，但您需要加载挡路样式文字标量 (这就是|指示的这种多行构造的名称) 字符串子类，请确保可以修改它，然后在转储时使用特殊的表示符 对于再次转储为文字标量的子类。

import sys
import ruamel.yaml


yaml = ruamel.yaml.YAML()
with open('aws-auth-cm.yaml') as f:
    content = yaml.load(f)
content['data']['mapRoles'] += '  rolearn: awsarn
'
with open('aws-auth-cm.yaml', 'w') as f:
    yaml.dump(content, f)

这提供了：

data:
  mapRoles: |
    - username: system:node:{{EC2PrivateDNSName}}
      groups:
      - system:bootstrappers
      - system:nodes
      rolearn: awsarn
kind: ConfigMap
metadata:
  name: aws-auth
  namespace: kube-system

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