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From: Steven Kryskalla <skryska...@gmail.com>
Date: Mon, 6 Aug 2012 07:56:57 -0700
Message-ID: <CADymufaphBKN9t0zb8-xJ-pOf6yYiZrvmt6bPdo8rE5P1g_...@mail.gmail.com>
Subject: Re: jinja - in lieu of enumerate and list comprehension
To: pocoo-libs@googlegroups.com
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On Mon, Aug 6, 2012 at 7:27 AM, Andreas <achristoffer...@gmail.com> wrote:
>  But jinja does not like enumerate either? There must be a smart way of
> doing this?

Jinja2 has special "loop" variables
(http://jinja.pocoo.org/docs/templates/#for), for example loop.index
to get the current iteration of the loop, and loop.last to tell if
this is the last iteration of the loop. So, you can do this:

>>> jinja2.Template("{% for x in xs %}{{x}}{% if not loop.last %},{% endif %}{% endfor %}").render(xs=[10,20,30,40])
u'10,20,30,40'

Or, if you wanted to use enumerate, you can pass it into the template:

>>> jinja2.Template("{% for i,x in enumerate(xs) %}{{ (i,x) }} {% endfor %}").render(xs=[10,20,30,40], enumerate=enumerate)
u'(0, 10) (1, 20) (2, 30) (3, 40) '

Or you could just write a function that does what you need, and pass
that function into the template:

>>> join_with_commas = lambda xs: ", ".join(str(x) for x in xs)
>>> jinja2.Template("{{ join_with_commas(xs) }}").render(xs=[10,20,30,40], join_with_commas=join_with_commas)
u'10, 20, 30, 40'

And finally, the best solution would be to just use the builtin "join" filter!

>>> jinja2.Template("{{ xs | join(', ') }}").render(xs=[10,20,30,40])
u'10, 20, 30, 40'

http://jinja.pocoo.org/docs/templates/#join

-steve