如何使用ruamel.yaml输出行分隔/格式化的json块？

eagi6jfj 于 2023-10-21 发布在其他

关注(0)|答案(1)|浏览(80)

我目前正在pyyaml中使用这个代码块，但是我想用ruamel.yaml完成同样的事情

import yaml
import json
envList=envList={"env":"development", "region":"us", "tag":"latest", "kubesvcname":"service", "containername":"testcontainer", "namespace":"kubens", "buildid":"1000"}
jsonFile = json.dumps(envList, indent=4)
configMapHeader={ \
    "apiVersion": "v1", \
    "kind":"ConfigMap", \
    "metadata": { \
        "name": f'{envList["kubesvcname"]}_{envList["containername"]}-{envList["tag"]}-{envList["buildid"]}', \
        "namespace": f'{envList["namespace"]}'\
    },
    "data":{"appsettings.json": \
             jsonFile }
}

def str_presenter(dumper, data):
    """configures yaml for dumping multiline strings
    Ref: https://stackoverflow.com/questions/8640959/how-can-i-control-what-scalar-form-pyyaml-uses-for-my-data"""
    if len(data.splitlines()) > 1:  # check for multiline string
        return dumper.represent_scalar('tag:yaml.org,2002:str', data, style='|')
    return dumper.represent_scalar('tag:yaml.org,2002:str', data)

yaml.representer.SafeRepresenter.add_representer(str, str_presenter) 
print(yaml.safe_dump(configMapHeader, sort_keys=False, line_break=True))

它的输出看起来像这样：

apiVersion: v1
kind: ConfigMap
metadata:
  name: service_testcontainer-latest-1000
  namespace: kubens
data:
  appsettings.json: |-
    {
        "env": "development",
        "region": "us",
        "tag": "latest",
        "kubesvcname": "service",
        "containername": "testcontainer",
        "namespace": "kubens",
        "buildid": "1000"
    }

当我尝试对ruamel.yaml执行类似的操作时，我会在输出文件中得到\n换行符。
这是代码：

def initYamlParser():
    import ruamel.yaml as yaml
    yaml = yaml.YAML()
    yaml.preserve_quotes = True
    yaml.explicit_start = True
    return yaml

import sys
import json
yaml=initYamlParser()
envList=envList={"env":"development", "region":"us", "tag":"latest", "kubesvcname":"service", "containerver": "latest", "containername":"testcontainer", "namespace":"kubens", "buildid":"1000"}
jsonFile = json.dumps(envList, indent=4)
configMapHeader={ \
    "apiVersion": "v1", \
    "kind":"ConfigMap", \
    "metadata": { \
        "name": f'{envList["kubesvcname"]}_{envList["containername"]}-{envList["containerver"]}-{envList["buildid"]}', \
        "namespace": f'{envList["namespace"]}'\
    },
    "data":{"appsettings.json": \
            jsonFile }
}
print(configMapHeader)
with open("file.yaml", 'w+') as file:
    yaml.dump(configMapHeader, file)

这是输出：

apiVersion: v1
kind: ConfigMap
metadata:
  name: service_testcontainer-latest-1000
  namespace: kubens
data:
  appsettings.json: "{\n    \"env\": \"development\",\n    \"region\": \"us\",\n \
    \   \"tag\": \"latest\",\n    \"kubesvcname\": \"service\",\n    \"containerver\"\
    : \"latest\",\n    \"containername\": \"testcontainer\",\n    \"namespace\": \"\
    kubens\",\n    \"buildid\": \"1000\"\n}"

yaml不支持str_presenter，所以我希望该函数有一个与ruamel.yaml兼容的版本，或者有一种在内部用ruamel.yaml表示它的方法

JSON

来源：https://stackoverflow.com/questions/77216266/how-to-use-ruamel-yaml-to-output-line-delimited-formatted-json-block

1条答案

按热度按时间

qyuhtwio1#

首先，在转储YAML文档时，通常不应该追加到文件中。由于ruamel.yaml将UTF-8写入文件，因此将其作为"wb"打开。
您设置了yaml.preserve_quotes = True，但这仅在往返时有效（加载YAML，然后转储）。
然后在ruamel.yaml中，你也可以有一个不同的表示器，只需将它附加到representer属性（它是Representer属性的示例，默认为RoundTripRepresenter）。唯一的区别是，它是作为第一个参数提交的代表：

import sys
import json
import ruamel.yaml
   
yaml = ruamel.yaml.YAML()
yaml.explicit_start = True

def str_presenter(cls, data):
    if len(data.splitlines()) > 1:  # check for multiline string
        return cls.represent_scalar('tag:yaml.org,2002:str', data, style='|')
    return cls.represent_scalar('tag:yaml.org,2002:str', data)

yaml.representer.add_representer(str, str_presenter)

envList={"env":"development", "region":"us", "tag":"latest", "kubesvcname":"service", "containerver": "latest", "containername":"testcontainer", "namespace":"kubens", "buildid":"1000"}
jsonFile = json.dumps(envList, indent=4)
configMapHeader={ \
    "apiVersion": "v1", \
    "kind":"ConfigMap", \
    "metadata": { \
        "name": f'{envList["kubesvcname"]}_{envList["containername"]}-{envList["containerver"]}-{envList["buildid"]}', \
        "namespace": f'{envList["namespace"]}'\
    },
    "data":{"appsettings.json": \
            jsonFile }
}
 

# print(data)
yaml.dump(configMapHeader, sys.stdout)

其给出：

---
apiVersion: v1
kind: ConfigMap
metadata:
  name: service_testcontainer-latest-1000
  namespace: kubens
data:
  appsettings.json: |-
    {
        "env": "development",
        "region": "us",
        "tag": "latest",
        "kubesvcname": "service",
        "containerver": "latest",
        "containername": "testcontainer",
        "namespace": "kubens",
        "buildid": "1000"
    }

如果加载预期的输出，然后转储它，可以看到ruamel.yaml可以保留块样式的文本标量。通过检查键appsetting.json的值，您将看到这是类LiteralScalarString的一个示例。这些知识可以用来使只有一个标量以这种方式转储（而不是所有嵌入了换行符的标量）：

import sys
import json
import ruamel.yaml
   
yaml = ruamel.yaml.YAML()
yaml.explicit_start = True

envList={"env":"development", "region":"us", "tag":"latest", "kubesvcname":"service", "containerver": "latest", "containername":"testcontainer", "namespace":"kubens", "buildid":"1000"}
jsonFile = json.dumps(envList, indent=4)
configMapHeader={ \
    "apiVersion": "v1", \
    "kind":"ConfigMap", \
    "metadata": { \
        "name": f'{envList["kubesvcname"]}_{envList["containername"]}-{envList["containerver"]}-{envList["buildid"]}', \
        "namespace": f'{envList["namespace"]}'\
    },
    "data":{"appsettings.json": \
            ruamel.yaml.scalarstring.LiteralScalarString(jsonFile) }
}

yaml.dump(configMapHeader, sys.stdout)

其给出：

---
apiVersion: v1
kind: ConfigMap
metadata:
  name: service_testcontainer-latest-1000
  namespace: kubens
data:
  appsettings.json: |-
    {
        "env": "development",
        "region": "us",
        "tag": "latest",
        "kubesvcname": "service",
        "containerver": "latest",
        "containername": "testcontainer",
        "namespace": "kubens",
        "buildid": "1000"
    }

你可能想看看envList=envList=....，不知道为什么你给同一个变量赋值两次
如果你想知道：因为JSON转储程序输出不包括最后的换行符，所以在文本标量指示符|-之后会有一个破折号

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如何使用ruamel.yaml输出行分隔/格式化的json块？

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