not revision_no works because of you just do Enter it will have empty 
string and empty string is False. It's matter of preference but I would 
test for that.

You can always do debug to see true value:

  tasks:
    - debug: msg={{revision_no}}

On Saturday, May 10, 2014 1:58:24 AM UTC+2, Michael DeHaan wrote:
>
> Seems like your variable is defined then, just False.
>
>
>
>
> On Wed, May 7, 2014 at 4:34 PM, Samnang Sen <samna...@gmail.com<javascript:>
> > wrote:
>
>> This does not work for me. Garrett's example does ...
>>
>>
>> On Monday, May 5, 2014 11:51:29 PM UTC-4, Michael DeHaan wrote:
>>
>>> You can say this specifically:
>>>
>>>        when: revision_no is not defined
>>>
>>>
>>>
>>> On Mon, May 5, 2014 at 1:19 PM, Garrett Plasky <gpl...@evernote.com>wrote:
>>>
>>>> There may be a better way to do this but I solved the problem by having 
>>>> a separate task initially that verifies the variable is set and fails the 
>>>> play if not (via the fail module).
>>>>
>>>> - name: Checking for required variables
>>>>   fail: msg="Playbook execution failed - 'revision_no' is required!"
>>>>   when: not revision_no
>>>>
>>>> If you don't want the play to outright fail, you could replace the fail 
>>>> module with something like debug.
>>>>
>>>> On Monday, May 5, 2014 7:58:27 AM UTC-7, Samnang Sen wrote:
>>>>>
>>>>> That last line is supposed to read "revision_no is defined"
>>>>>
>>>>> On Monday, May 5, 2014 10:53:54 AM UTC-4, Samnang Sen wrote:
>>>>>>
>>>>>> Let's say I ask for a revision_no from the user. If the user doesn't 
>>>>>> input a value, I would like to display a custom message. Right now 
>>>>>> ansible 
>>>>>> shows a bunch of "skipping" message, but I know my users would want to 
>>>>>> know 
>>>>>> why it skipped.
>>>>>>
>>>>>> - hosts: webservers
>>>>>>   user: deployment
>>>>>> #  serial: 1
>>>>>>
>>>>>>
>>>>>>   vars_prompt:
>>>>>>    - name: "revision_no"
>>>>>>      prompt: "Input revision number"
>>>>>>      private: no
>>>>>>
>>>>>>   vars_files:
>>>>>>   - "group_vars/deploy_list"
>>>>>>
>>>>>>   roles:
>>>>>>   - { role: web, when: revision_no is not defined }
>>>>>>
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