how to get all the "variables" of a string formating?

[dakman at gmail.com]

"Is there an easy (i.e.: no regex) way to do get the names of all
parameters? "

...regexp is the easy way :D

GHUM wrote:
> imagine:
>
>
> template=""" Hello %(name)s, how are you %(action)s"""
>
>
> we can use it to do things like:
>
> print template % dict (name="Guido", action="indenting")
>
>
> Is there an easy (i.e.: no regex) way to do get the names of all
> parameters?
>
> get_parameters(template) should return ["name", "action"]
>
>
> Python has to do this somewhere internally..... how to access this
> knowledge?
> 
> Harald