金贾的字符串串联

我只想循环遍历一个现有的列表，然后用它创建一个逗号分隔的字符串。
就像这样: my_string = 'stuff, stuff, stuff, stuff'

我已经知道关于 loop.last，我只是需要知道如何使我的代码下面的第三行工作。

{% set my_string = '' %}
{% for stuff in stuffs %}
{% set my_string = my_string + stuff + ', '%}
{% endfor%}
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最佳答案

If stuffs is a list of strings, just this would work:

\{\{ stuffs|join(", ") }}

See join filter documentation, as well as filters in general documentation.

p.s.

More reader friendly way

\{\{ my ~ ', ' ~ string }}
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My bad, in trying to simplify it, I went too far, actually stuffs is a record of all kinds of info, I just want the id in it. 

stuffs = [[123, first, last], [456, first, last]]

I want my_sting to be 

my_sting = '123, 456'

My original code should have looked like this:

{% set my_string = '' %}
{% for stuff in stuffs %}
{% set my_string = my_string + stuff.id + ', '%}
{% endfor%}

Thinking about it, stuffs is probably a dictionary, but you get the gist.

Yes I found the join filter, and was going to approach it like this:

 {% set my_string = [] %}
{% for stuff in stuffs %}
{% do my_string.append(stuff.id) %}
{% endfor%}
{%  my_string|join(', ') %}

But the append doesn't work without importing the extensions to do it, and reading that documentation gave me a headache. It doesn't explicitly say where to import it from or even where you would put the import statement, so I figured finding a way to concat would be the lesser of the two evils.

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Just another hack can be like this.

I have Array of strings which I need to concatenate. So I added that array into dictionary and then used it inside for loop which worked.

{% set dict1 = {'e':''} %}
{% for i in list1 %}
{% if dict1.update({'e':dict1.e+":"+i+"/"+i}) %} {% endif %}
{% endfor %}
{% set layer_string = dict1['e'] %}
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If you can't just use filter join but need to perform some operations on the array's entry:

{% for entry in array %}
User \{\{ entry.attribute1 }} has id \{\{ entry.attribute2 }}
{% if not loop.last %}, {% endif %}
{% endfor %}
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You can use + if you know all the values are strings. Jinja also provides the ~ operator, which will ensure all values are converted to string first.

{% set my_string = my_string ~ stuff ~ ', '%}

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