Python 在 JINJA2 中连接列表
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Concatenate lists in JINJA2
提问by ccbunney
How can I concatenate two list variables in jinja2?
如何在 jinja2 中连接两个列表变量？
E.G.
例如
GRP1 = [1, 2, 3]
GRP2 = [4, 5, 6]
{# This works fine: #}
{% for M in GRP1 %}
Value is {{M}}
{% endfor %}
{# But this does not: #}
{% for M in GRP1 + GRP2 %}
Value is {{M}}
{% endfor %}
So, I have tried to concatenate the two lists using + (like you would in Python), but it turns out that they are not lists, but python xrangeobjects:
因此，我尝试使用 + 连接两个列表（就像在 Python 中一样），但事实证明它们不是列表，而是 Pythonxrange对象：
jijna2 error: unsupported operand type(s) for +: 'xrange' and 'xrange'
Is there a way for me to iterate over the concatenation of GRP1 and GRP2 in the same for loop?
有没有办法让我在同一个 for 循环中迭代 GRP1 和 GRP2 的串联？
采纳答案by Jon Clements
AFAIK you can't do it using native Jinja2 templating. You're better off creating a new combined iterable and passing that to your template, eg:
AFAIK 您不能使用本机 Jinja2 模板来做到这一点。您最好创建一个新的组合迭代并将其传递给您的模板，例如：
from itertools import chain
x = xrange(3)
y = xrange(3, 7)
z = chain(x, y) # pass this to your template
for i in z:
print i
As per comments, you can explicitly convert the iterables into lists, and concatenate those:
根据评论，您可以将可迭代对象显式转换为列表，并将它们连接起来：
{% for M in GRP1|list + GRP2|list %}
回答by Jordan Stewart
Concatenating lists like {{ GRP1 + GRP2 }}is available, in at less jinja2 version v.2.9.5
类似的连接列表{{ GRP1 + GRP2 }}可用，在 jinja2 版本 v.2.9.5
@Hsiao gave this answer originally as a comment
@Hsiao 最初作为评论给出了这个答案
