@Matt Martz : I am sorry to ask silly questions, regarding ansible as by 
seeing the small piece of code, i can understand you must be an ansible 
expert. If possible you can help me in my problem explanation a bit. 

And any such links for learning you want to refer, please refer me. As i 
googled selectattr but first|first parameter which you have passed i am not 
getting any good document. If you can help me in referring such, it would 
be of very nice help.

On Wednesday, April 11, 2018 at 9:36:13 PM UTC+5:30, Bishwajit Samanta 
> I am glad you replied so fast, but sorry to say i am not an ansible expert 
> . I am just a beginner . I just typed the code. Can you help me in 
> understanding  where i am not correct.
> ---
> - hosts: devops
>   tasks:
>     - debug:
>        msg: "{{ hostinfo|dictsort|selectattr('1.hostclass', 'equalto', 
> 'ess')|first|first }}"
> ~
> ~
> On Wednesday, April 11, 2018 at 8:54:15 PM UTC+5:30, Bishwajit Samanta 
> wrote:
>> i am having a problem in finding solution. I have a piece of file which 
>> contains data in below format (json type with quotes)::-
>> hostinfo:
>>   'host001':
>>     ip: x.x.x.x
>>     hostclass: 'puppet'
>>   'host002':
>>     ip: y.y.y.y
>>     hostclass: 'ess'
>>   'host003':
>>     ip: z.z.z.z
>>     hostclass: 'mdb'
>> Now my task is to find out the hostname of the system belong to hostclass 
>> 'ess' , which in this case the answer in host002. I have to write an 
>> ansible script to find out the result. Can anyone help me in finding out, 
>> or any idea to approach for the problem.
>> Issue Type:: Finding a phrase through ansible
>> Ansible Version:: Ansible 2.4.0
>> Component Name:: It looks similar to json type file.

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