[Python-ideas] string.Template v2

[Ned Batchelder]

On 11/28/13 11:57 AM, anatoly techtonik wrote:
> http://docs.python.org/2/library/string.html#template-strings
>
> ## Original Idea
>
> stdlib lacks the most popular basic variable extension syntax
> "{{ variable }}" that can be found in Django [1], Jinja2 [2] and
> other templating engines [3].
Anatoly, you've been participating here long enough to know that an 
important question to answer is:  why does the stdlib need this 
functionality?  As you point out here, it is already available from 
popular third-party packages.  Why not just let them provide the 
functionality, and leave it at that?

--Ned.
> ## stdlib Analysis
>
> string.Template syntax is ancient (dates back to Python 2.4
> from 9 years ago). I haven't seen a template like this for a long time.
>
> ## Scope of Enhancement
>
> st = 'Hello {{world}}.'
> world = 'is not enough'
> t = Template(string, style='brace')
> t.render(locals())
>
> ## Links
>
> 1. https://docs.djangoproject.com/en/dev/topics/templates/#variables
> 2. http://jinja.pocoo.org/docs/templates/#variables
> 3. http://mustache.github.io/
>
> ## Feature Creeping
>
> # Allow to override {{ }} symbols to make it more generic.
>
> # `foo.bar` attribute lookup for 2D (nested) structures.
>
> Questions is it has to be supported:
>    `foo.bar` in Django does dictionary lookup first, then attribute lookup
>    `foo.bar` in Jinja2 does attribute lookup first
>
> I am not sure which is better. I definitely don't want some method or
> property on a dict passed to render() method to hide dict value.
> --
> anatoly t.
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