Variable inside variable in Jinja2

1. Summary

I can't set use variable inside variable in my Jinja2 example.

Solution must be Pelican-compatible.

2. MCVE

2.1. Expected behavior

Any text

    Goddess Kira greatest of all time!

    Goddess Kristina greatest of all time!


Another text

    Goddess Sasha greatest of all time!

    Goddess Katya greatest of all time!

2.2. my attempt

Live demo on Repl.it:

"""Jinja2 nested variables example."""
from jinja2 import Template

KIRA_BLOCK = """
{% set first_list = ['Kira', 'Kristina'] %}
Any text
{% for name in first_list %}
    Goddess {{name}} greatest of all time!
{% endfor %}
{% set second_list = ['Sasha', 'Katya'] %}
Another text
{% for name in second_list %}
    Goddess {{name}} greatest of all time!
{% endfor %}
"""

print(Template(KIRA_BLOCK).render())

2.3. Problem

I have duplicate Goddess and greatest of all time! in loops. Can I don't use duplicates?

3. Not helped

3.1. Similar questions

This, this, this and many others Stack Overflow questions.

3.2. Nested variables

For example, this code doesn't work:

"""Jinja2 nested variables example."""
from jinja2 import Template

KIRA_BLOCK = """
{% set she_greatest = 'Goddess' {{name}} 'greatest of all time!' %}
{% set first_list = ['Kira', 'Kristina'] %}
Any text
{% for name in first_list %}
    {{she_greatest}}
{% endfor %}
{% set second_list = ['Sasha', 'Katya'] %}
Another text
{% for name in second_list %}
    {{she_greatest}}
{% endfor %}
"""

print(Template(KIRA_BLOCK).render())

I get traceback:

Traceback (most recent call last):
  File "KiraJinja2.py", line 18, in <module>
    print(Template(KIRA_BLOCK).render())
  File "C:\Python37\lib\site-packages\jinja2\environment.py", line 945, in __new__
    return env.from_string(source, template_class=cls)
  File "C:\Python37\lib\site-packages\jinja2\environment.py", line 880, in from_string
    return cls.from_code(self, self.compile(source), globals, None)
  File "C:\Python37\lib\site-packages\jinja2\environment.py", line 591, in compile
    self.handle_exception(exc_info, source_hint=source_hint)
  File "C:\Python37\lib\site-packages\jinja2\environment.py", line 780, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "C:\Python37\lib\site-packages\jinja2\_compat.py", line 37, in reraise
    raise value.with_traceback(tb)
  File "<unknown>", line 2, in template
  File "C:\Python37\lib\site-packages\jinja2\environment.py", line 497, in _parse
    return Parser(self, source, name, encode_filename(filename)).parse()
  File "C:\Python37\lib\site-packages\jinja2\parser.py", line 901, in parse
    result = nodes.Template(self.subparse(), lineno=1)
  File "C:\Python37\lib\site-packages\jinja2\parser.py", line 888, in subparse
    self.stream.expect('block_end')
  File "C:\Python37\lib\site-packages\jinja2\lexer.py", line 384, in expect
    self.name, self.filename)
jinja2.exceptions.TemplateSyntaxError: expected token 'end of statement block', got '{'

4. Real example

For preventing XY Problem I post truncated real code:

4.1. Expected behavior

<div class="KiraCategory">First</div>

    <a onclick="KiraFunction(document.all.sitename.value, 'https://Alpha.com');" class="Foo">Alpha</a>

    <a onclick="KiraFunction(document.all.sitename.value, 'https://Bravo.ru');" class="Bar">Beta</a>


<div class="KiraCategory">Second</div>

    <a onclick="KiraFunction(document.all.sitename.value, 'https://Charlie.net');" class="Baz">Gamma</a>

The example shows where static is and where variables.

4.2. my attempt

Live demo on Repl.it:

"""Jinja2 nested variables example."""
from jinja2 import Template

KIRA_BLOCK = """
{% set first_list = [
    ('https://Alpha.com', 'Foo', 'Alpha'),
    ('https://Bravo.ru', 'Bar', 'Beta')
] %}
<div class="KiraCategory">First</div>
{% for url, color, sitename in first_list %}
    <a onclick="KiraFunction(document.all.sitename.value, '{{url}}');" class="{{color}}">{{sitename}}</a>
{% endfor %}
{% set second_list = [
    ('https://Charlie.net', 'Baz', 'Gamma'),
] %}
<div class="KiraCategory">Second</div>
{% for url, color, sitename in second_list %}
    <a onclick="KiraFunction(document.all.sitename.value, '{{url}}');" class="{{color}}">{{sitename}}</a>
{% endfor %}
"""

print(Template(KIRA_BLOCK).render())

Duplicates in my attempt.

Solution

You are looking for Jinja macros; functions that produce output when called:

{% macro she_greatest(name) -%}
    Goddess {{name}} greatest of all time!
{%- endmacro %}

{% set first_list = ['Kira', 'Kristina'] %}
Any text
{% for name in first_list %}
    {{ she_greatest(name) }}
{% endfor %}
{% set second_list = ['Sasha', 'Katya'] %}
Another text
{% for name in second_list %}
    {{ she_greatest(name) }}
{% endfor %}

Demo:

>>> from jinja2 import Template
>>> demo = '''
... {% macro she_greatest(name) -%}
...     Goddess {{name}} greatest of all time!
... {%- endmacro %}
...
... {% set first_list = ['Kira', 'Kristina'] %}
... Any text
... {% for name in first_list %}
...     {{ she_greatest(name) }}
... {% endfor %}
... {% set second_list = ['Sasha', 'Katya'] %}
... Another text
... {% for name in second_list %}
...     {{ she_greatest(name) }}
... {% endfor %}
... '''
>>> print(Template(demo).render())




Any text

    Goddess Kira greatest of all time!

    Goddess Kristina greatest of all time!


Another text

    Goddess Sasha greatest of all time!

    Goddess Katya greatest of all time!

or, applying this to your real-life example:

{% macro kira_function_link(url, color, sitename) -%}
<a onclick="KiraFunction(document.all.sitename.value, '{{url}}');" class="{{color}}">{{sitename}}</a>
{%- endmacro %}

{% set first_list = [
    ('https://Alpha.com', 'Foo', 'Alpha'),
    ('https://Bravo.ru', 'Bar', 'Beta')
] %}
<div class="KiraCategory">First</div>
{% for url, color, sitename in first_list %}
    {{ kira_function_link(url, color, sitename) }}
{% endfor %}
{% set second_list = [
    ('https://Charlie.net', 'Baz', 'Gamma'),
] %}
<div class="KiraCategory">Second</div>
{% for url, color, sitename in second_list %}
    {{ kira_function_link(url, color, sitename) }}
{% endfor %}