Re: [Fab-user] %(my_var)s or $(my_var)

[Loic d'Anterroches]

Hi Christian,

> The difference is the evaluation time. The %(...)s notation is
> evaluated as soon as possible, whereas the $() notation is lazily
> evaluated.
> 
> This example illustrates the difference:
> 
> def test():
>     set(var = 'a')
>     set(cmd = 'echo %(var)s $(var)')
>     set(var = 'b')
>     local(get('cmd'))
> 
> If you run that as a command with fabric, it will print "a b".
> 
> The drawback with the lazy notation is that you can't apply any
> formatting rules to it, but you hardly ever need to do that in a
> fabrfile anyway so I don't think it's a big issue.

Thanks! This is exactly what I needed to know.

Best regards,
loïc

> On 5/4/08, Loic d'Anterroches <address@hidden> wrote:
>> Hi Christian,
>>
>>  I am slowly starting to standardize all my deployment scripts to use fab
>>  with a standard set of commands. That way I can do:
>>
>>  $ cd ~/Websites/my.website.com
>>  $ fab prod build deploy
>>
>>  or simply do that in all the folders in ~/Websites to update all my
>>  websites in one go.
>>
>>  It is working great, but I have a small question:
>>  What is the difference between %(my_var)s and $(my_var) in the commands?
>>  Do they have different way to be interpolated?
>>
>>  Best regards,
>>  loïc
>>
>>  Note: Great idea the website, you should also link to your relevent blog
>>  posts.
>>
>>  --
>>  Pluf PHP5 Framework inspired by Django
>>  http://www.pluf.org
>>
>>
>>
>>
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>>
> 
>