Template for loop and separator

[Ken]

Hi,all

Sometime I need template result like:
[1,2,3,4]

{
'a',
'b',
'c'
}

(there is no more comma after the last element)

Normally, we use template like below:
{% for item in items %}
{{ escape(item) }},
{% end %}

It's not worked.

I know str.join function work fine in these situations. My question is:
Is there any solution in Template?

google-ctemplate solution:
http://ctemplate.googlecode.com/svn/trunk/doc/reference.html#separator

Thanks

-Ken

[Alek Storm]

If {{','.join(items)}} works fine, why do you need something else? Also, values are auto-escaped as of Tornado 2.0; there's no need to explicitly call escape().

Alek

[Felinx Lee]

{{ escape(“,”.join(items)) }}

Does this work?

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[Matt Ferguson]

It sounds like you might be trying to use this in JavaScript, in which case you're better off using json_encode.

[Ken]

Thanks to Alek, Felinx, Matt

These are not template solution.

Sometimes there are too much code for process looped item, str.join
maybe is not the best solution.

Please take a look google-ctemplate separator[1]:
{{#ATTENDEES}}
{{NAME}}
{{#ATTENDEES_separator}}, {{/ATTENDEES_separator}}
{{/ATTENDEES}}

I wrote huge mount of templates in ctemplate format, the separator is
very useful.

1: http://ctemplate.googlecode.com/svn/trunk/doc/reference.html#separator

-Ken

[Ben Darnell]

Tornado templates let you write arbitrary python code, so you can do
things like this without specialized support from the template
language itself. For example, you could do:

{% for i, attendee in enumerate(attendees) %}
{{ attendee.name }}{% if i != len(attendees) %}, {% end %}
{% end %}

You could also write an enumerate-like ui_method that would let you
test whether you're on the last element of a list in a less clunky
way.

-Ben

[Ken]

This way help:

{% if i != len(attendees) %}, {% end %}

Thanks Ben
Thanks to everyone