使用python ruamel.yaml将内容添加到yaml文件时，从dict值中删除单引号 [英] remove single quotes from dict values while adding content to yaml file using python ruamel.yaml

问题描述

我有一个yaml文件，如下所述 test1.yaml

I have an yaml file as mentioned below test1.yaml

resources:
  name:{get_param: vname}
  ssh_keypair: {get_param: ssh_keypair}

现在，我想在test1.yaml资源下添加test1_routable_net:{get_param:abc_routable_net} 这是我尝试过的代码

Now I want to add test1_routable_net: { get_param: abc_routable_net } under resources of test1.yaml Here is the code which I tried

import ruamel.yaml
yaml = ruamel.yaml.YAML()
test="{ get_param: abc_routable_net }".strip(‘\’’)
with open('/tmp/test1.yaml') as fp:
    data = yaml.load(fp)
data['resources'].update({‘test1_routable_net’:test})

yaml.dump(data,file('/tes2.yaml', 'w'))

上面代码的

输出是 tes2.yaml

output of above code is tes2.yaml

resources:
  name:{get_param: vname}
  ssh_keypair: {get_param: ssh_keypair}
  test1_routable_net: '{ get_param: abc_routable_net }'

所需的输出是
tes2.yaml

Desired output is
tes2.yaml

resources:
  name:{get_param: vname}
  ssh_keypair: {get_param: ssh_keypair}
  test1_routable_net: { get_param: abc_routable_net }

我尝试使用test.strip('\'')，但仍然没有用，我看到值的单引号....如何从值中删除那些引号?

I tried using test.strip('\'') , but no use still I see single quotes for the value .... How can I remove those quotes from the value?

推荐答案

在您的程序中，test是一个字符串.字符串通常在转储时不加引号，但是如果它们的解释会模棱两可，那么它们会被引用.这就是为什么您的输出在其周围加上单引号的原因:确保在读回该节点时不会被错误地解释为映射而不是字符串. 因此，用.strip()删除不存在的引号不会执行任何操作.

In your program test is a string. Strings normally don't get quoted when dumped, but if their interpretation would be ambiguous, they will be. That is the reason why your output has the single quotes around them: to make sure that on reading back in this node is not incorrectly interpreted as a mapping instead of a string. Removing the non-existent quotes with .strip() therefore doesn't do anything.

您应该从要完成的工作开始倒退(实际上，您需要映射而不是字符串，就像从输出中看到的那样).

You should work backwards from what you what you want to accomplish (you actually want a mapping instead of a string, as one can see from the output).

如果加载所需的输出，您将看到test1_routable_net的值是python dict(或其子类)，因此请确保这是您分配给test的内容:

If you load your desired output, you will see that the value for test1_routable_net is a python dict (or a subclass thereof), so make sure that is what you assign to test:

import sys
import ruamel.yaml
yaml = ruamel.yaml.YAML()
test = { 'get_param': 'abc_routable_net' }
with open('./test1.yaml') as fp:
    data = yaml.load(fp)
data['resources'].update({'test1_routable_net': test})

yaml.dump(data, sys.stdout)

哪个给:

resources:
  name:{get_param: vname}
  ssh_keypair: {get_param: ssh_keypair}
  test1_routable_net:
    get_param: abc_routable_net

从语义上讲，它与所需的输出相同，但是由于您希望以流样式显示get_param: abc_routable_net，因此可以添加:

This is semantically the same as your desired output, but since you want the get_param: abc_routable_net in flow-style, you could add:

yaml.default_flow_style=None

以获得所需的输出.您还可以查看将ruamel.comments.CommentedMap分配给test，这使您可以更精细地控制其样式(和注释等).

to get your desired output. You can also look at assigning, to test, a ruamel.comments.CommentedMap, which gives you more fine grained control over its style (and comments, etc.).

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