[Tutor] string.Template

[Chris “Kwpolska” Warrick]

On Tue, Apr 23, 2013 at 4:14 PM, Albert-Jan Roskam <fomcl at yahoo.com> wrote:
> Hello,
>
> Is there a better, *built-in* alternative for the code below? The recursion works,
> but it feels like reinventing the wheel.
>
> import string
>
> def translate(template, *args):
>     """Recursively $-substitute <template> using <args> as a replacement"""
>     syntax = string.Template(template).substitute(*args)
>     if "$" in syntax:
>         return translate(syntax, *args)
>     return syntax
>
> template = """\
> Monty $surname
> $more
> """
> more = """\
> The quest for the holy $grail
> """
> surname="Python"
> grail="Grail"
> print translate(template, locals())
>
> Thank you!
>
> Regards,
> Albert-Jan
>
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> All right, but apart from the sanitation, the medicine, education, wine, public order, irrigation, roads, a
> fresh water system, and public health, what have the Romans ever done for us?
>     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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1. locals() is hacky and you shouldn’t use it.
2. Do you need “$”?  Why not use the newfangled {} syntax (since
Python 2.6)?  Example:
       '2 + 2 = {val}'.format(val='fish')
   Or:
       '2 + 2 = {0}'.format('fish')
   Or even:
       '2 + 2 = {}'.format('fish')
3. I doubt that there is anything better if you want $.

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