Jinja2 中的变量内部变量
Variable inside variable in Jinja2
1。摘要
我无法在我的 Jinja2 示例中设置 use variable inside variable。
解决方案必须 Pelican 兼容。
2。 MCVE
2.1。预期行为
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。我的尝试
"""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。问题
我在循环中有重复的 Goddess 和 greatest of all time!。我可以不使用重复项吗？
3。没有帮助
3.1。类似问题
, , this and many others 堆栈溢出问题。
3.2。嵌套变量
例如，此代码不起作用：
"""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())
我得到回溯：
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。实例
为了防止XY Problem我post截断真实代码：
4.1。预期行为
<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>
该示例显示了静态和变量的位置。
4.2。我的尝试
"""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())
我尝试重复。
您正在寻找Jinja macros；调用时产生输出的函数：
{% 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 %}
演示：
>>> 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!
或者，将此应用到您的真实示例中：
{% 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 %}
1。摘要
我无法在我的 Jinja2 示例中设置 use variable inside variable。
解决方案必须 Pelican 兼容。
2。 MCVE
2.1。预期行为
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。我的尝试
"""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。问题
我在循环中有重复的 Goddess 和 greatest of all time!。我可以不使用重复项吗？
3。没有帮助
3.1。类似问题
3.2。嵌套变量
例如，此代码不起作用：
"""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())
我得到回溯：
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。实例
为了防止XY Problem我post截断真实代码：
4.1。预期行为
<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>
该示例显示了静态和变量的位置。
4.2。我的尝试
"""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())
我尝试重复。
您正在寻找Jinja macros；调用时产生输出的函数：
{% 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 %}
演示：
>>> 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!
或者，将此应用到您的真实示例中：
{% 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 %}