blocks|key|191499|text|你可以按照下面的思路做一些事情：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|191500|import+json

j='''{+"hosts":++{
+++++++++++++"example1.lab.com"+:+["mysql",+"apache"],
+++++++++++++"example2.lab.com"+:+["sqlite",+"nmap"],
+++++++++++++"example3.lab.com"+:+["vim",+"bind9"]
+++++++++++++}
}'''

specific_key='example2'

found=False
for+key,di+in+json.loads(j).iteritems():++++#+items+on+Py+3k
++++for+k,v+in+di.items():
++++++++if+k.startswith(specific_key):
++++++++++++found=True
++++++++++++print+k,v
++++++++++++break
++++if+found:
++++++++break+|code-block|syntax|javascript|191501|或者，您可以这样做：|191502|def+pairs(args):
++++for+arg+in+args:
++++++++if+arg[0].startswith(specific_key):
++++++++++++k,v=arg
++++++++++++print+k,v

json.loads(j,object_pairs_hook=pairs)++|191503|无论哪种情况，都会打印：|191504|example2.lab.com+[u'sqlite',+u'nmap']|191505|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

You could do something along these lines:

<pre><code>import json

j='''{ "hosts": {
 "example1.lab.com" : ["mysql", "apache"],
 "example2.lab.com" : ["sqlite", "nmap"],
 "example3.lab.com" : ["vim", "bind9"]
 }
}'''

specific_key='example2'

found=False
for key,di in json.loads(j).iteritems(): # items on Py 3k
 for k,v in di.items():
 if k.startswith(specific_key):
 found=True
 print k,v
 break
 if found:
 break 
</code></pre>

Or, you could do:

<pre><code>def pairs(args):
 for arg in args:
 if arg[0].startswith(specific_key):
 k,v=arg
 print k,v

json.loads(j,object_pairs_hook=pairs) 
</code></pre>

Either case, prints:

<pre><code>example2.lab.com [u'sqlite', u'nmap']
</code></pre>

blocks|key|623311|text|如果有字符串形式的JSON，那么只需使用Python的json.loads()函数来加载JSON，解析JSON，并通过将其绑定到某个本地名称来将其内容加载到您的命名空间中|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|623312|示例：|623313|#!/bin/env+python
import+json
some_json+=+'''{+"hosts":++{
+++++++++"example1.lab.com"+:+["mysql",+"apache"],
+++++++++"example2.lab.com"+:+["sqlite",+"nmap"],
+++++++++"example3.lab.com"+:+["vim",+"bind9"]
+++++++++}
}'''
some_stuff+=+json.loads(some_json)
print+some_stuff['hosts'].keys()

--->+[u'example1.lab.com',+u'example3.lab.com',+u'example2.lab.com']|code-block|syntax|javascript|623314|如图所示，然后访问some_stuff的内容，就像访问任何其他Python字典一样…在JSON中序列化(编码)的所有顶级变量声明/赋值都将是该字典中的键。|623315|如果JSON内容在一个文件中，您可以像在Python中打开任何其他文件一样打开它，并将文件对象的名称传递给json.load()函数：|623316|#!/bin/python
import+json

with+open("some_file.json")+as+f:
++++some_stuff+=+json.load(f)

print+'+'.join(some_stuff.keys())|623317|entityMap^0|R|C|0|0|0|9|A|0|1H|B|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|J|7|15|8|@]|D|@]|E|$K|L]]|$1|S|3|-4|5|6|7|16|8|@]|D|@]|E|$]]]|T|$]]

If you have the JSON in a string then just use Python's <code>json.loads()</code> function to load JSON parse the JSON and load its contents into your namespace by binding it to some local name

Example:

<pre><code>#!/bin/env python
import json
some_json = '''{ "hosts": {
 "example1.lab.com" : ["mysql", "apache"],
 "example2.lab.com" : ["sqlite", "nmap"],
 "example3.lab.com" : ["vim", "bind9"]
 }
}'''
some_stuff = json.loads(some_json)
print some_stuff['hosts'].keys()

---&gt; [u'example1.lab.com', u'example3.lab.com', u'example2.lab.com']
</code></pre>

As shown you then access the contents of <code>some_stuff</code> just as you would any other Python dictionary ... all the top level variable declaration/assignments which were serialized (encoded) in the JSON will be keys in that dictionary.

If the JSON contents are in a file you can open it like any other file in Python and pass the file object's name to the <code>json.load()</code> function:

<pre><code>#!/bin/python
import json

with open("some_file.json") as f:
 some_stuff = json.load(f)

print ' '.join(some_stuff.keys())
</code></pre>

blocks|key|623319|text|如果上面的json文件存储为'samplefile.json'，您可以用python编写以下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|623320|import+json
f+=+open('samplefile.json')
data+=+json.load(f)

value1+=+data['hosts']['example1.lab.com']
value2+=+data['hosts']['example2.lab.com']
value3+=+data['hosts']['example3.lab.com']|code-block|syntax|javascript|623321|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If the above json file is stored as 'samplefile.json', you can write following in python:
<pre><code>import json
f = open('samplefile.json')
data = json.load(f)

value1 = data['hosts']['example1.lab.com']
value2 = data['hosts']['example2.lab.com']
value3 = data['hosts']['example3.lab.com']
</code></pre>

a bit new to python and json.
i have this json file:

<pre><code>{ "hosts": {
 "example1.lab.com" : ["mysql", "apache"],
 "example2.lab.com" : ["sqlite", "nmap"],
 "example3.lab.com" : ["vim", "bind9"]
 }
}
</code></pre>

what i want to do is use the hostname variable and extract the values of each hostname.
its a bit hard to explain but im using saltstack, which already iterates over hosts and i want it to be able to extract each host's values from the json file using the hostname variable.

hope im understood.

thanks
o.

python - extract a specific key / value from json file by a variable

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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对python和json有点陌生。我有这个json文件：{ "hosts":  {             "example1.lab.com" : ["mysql", "apache"],             "example2.lab.com" : ["sqlite", "nmap"],            ...

问python -通过变量从json文件中提取特定的键/值
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