问题描述

我在将 YAML 文件中的文档映射到 dict 并正确映射它们时遇到以下问题.

I am having the following problem of mapping documents within a YAML file to a dict and properly mapping them.

我有以下 YAML 文件，它代表一个服务器 (db.yml):

I have the following YAML file, which represents a server (db.yml):

instanceId: i-aaaaaaaa
     environment:us-east
     serverId:someServer
     awsHostname:ip-someip
     serverName:somewebsite.com
     ipAddr:192.168.0.1
     roles:[webserver,php]

我加载了这个 YAML 文件，我可以毫无问题地这样做，我想我明白了.

I load this YAML file, which I can do without any problems, I think I understand that.

instanceId = getInstanceId()
stream = file('db.yml', 'r')
dict = yaml.load_all(stream)

for key in dict:
    if key in dict == "instanceId":
        print key, dict[key]

我希望逻辑如下所示:

• 加载yaml，映射到dict
• 查看文档中的每个 dict，如果 instanceId 与 getInstanceId() 设置的匹配，则打印出该文档的所有键和值.

• load yaml, map to dict
• look in every dict in the document, if the instanceId matches that which was set by getInstanceId(), then print out all of the keys and values for that document.

如果我从命令行查看地图数据结构，我会得到:

If I look at the map data structure from the command line, I get:

{'instanceId': 'i-aaaaaaaa environment:us-east serverId:someServer awsHostname:ip-someip serverName:someserver ipAddr:192.168.0.1 roles:[webserver,php]'}

我想我可能不正确地为 YAML 文件创建数据结构，并且在匹配 dict 上的内容时，我有点迷失了.

I think I might be creating the data structure for the YAML file improperly, and on matching the contents on the dict, I am a bit lost.

旁注:我无法使用 yaml.load() 加载此文件中的所有文档，我尝试了 yaml.load_all()，这似乎可行，但我的主要问题仍然存在.

Side note: I cannot load all of the documents in this file using yaml.load(), I tried yaml.load_all(), which seems to work but my main issue still exists.

推荐答案

我认为你的 yaml 文件应该看起来像(或者至少是类似的，所以它的结构是正确的):

I think your yaml file should look like (or at least something like, so it's structured correctly anyway):

instance:
     Id: i-aaaaaaaa
     environment: us-east
     serverId: someServer
     awsHostname: ip-someip
     serverName: somewebsite.com
     ipAddr: 192.168.0.1
     roles: [webserver,php]

然后，yaml.load(...) 返回:

{'instance': {'environment': 'us-east', 'roles': ['webserver', 'php'], 'awsHostname': 'ip-someip', 'serverName': 'somewebsite.com', 'ipAddr': '192.168.0.1', 'serverId': 'someServer', 'Id': 'i-aaaaaaaa'}}

你可以从那里去......

And you can go from there...

所以像这样使用:

>>> for key, value in yaml.load(open('test.txt'))['instance'].iteritems():
    print key, value


environment us-east
roles ['webserver', 'php']
awsHostname ip-someip
serverName somewebsite.com
ipAddr 192.168.0.1
serverId someServer
Id i-aaaaaaaa

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