如何修改/合并Jinja2字典? [英] How can I modify/merge Jinja2 dictionaries?
问题描述
>>> import jinja2
>>> e = jinja2.Environment()
修改dict:Fails。
>>> e.from_string({{x [4] = 5}})。render({'x':{1:2,2:3}})
追溯(最近的最后一次呼叫):
文件< stdin>,第1行,< module>
文件jinja2 / environment.py,第743行,from_string
返回cls.from_code(self,self.compile(source),全局变量,无)
文件jinja2 / environment py,第469行,编译
self.handle_exception(exc_info,source_hint = source)
文件< unknown>,第1行,模板
jinja2.exceptions.TemplateSyntaxError:expected令牌
'结束打印声明',获得'='
两阶段更新:打印多余的无。
>>> e.from_string({{x.update({4:5}}}} {{x}})render({'x':{1:2,2:3}})
u '无{1:2,2:3,4:5}'
>>> e.from_string({{dict(x.items()+ {3:4} .items())}})render({'x':{1:2,2:3}})
追溯(最近的最后一次呼叫):
文件< stdin>,第1行,< module>
文件jinja2 / environment.py,第868行,呈现
return self.environment.handle_exception(exc_info,True)
文件< template>,第1行,顶部-level模板代码
TypeError:<(>()正好是0个参数(1)
使用 dict(x,** y)
:失败。
>>> e.from_string({{dict((3,4),** x)}})render({'x':{1:2,2:3}})
追溯(最近call last):
文件< stdin>,第1行,< module>
文件jinja2 / environment.py,第868行,呈现
return self.environment.handle_exception(exc_info,True)
文件< template>,第1行,顶部-level模板代码
TypeError:call()关键字必须是字符串
那么一个通过更改属性或与另一个字典合并来修改Jinja2中的字典 x
?
此问题类似于: 如何将两个Python字典合并为一个单一的表达式? - 就像Jinja2和Python类似。
听起来像 Jinja2do语句扩展名可能有帮助。启用此扩展将允许您重写:
{{x.update({4:5}}}} {{x}}
as
{%do x .update({4:5})%} {{x}}
。
示例:
>>> import jinja2
>>> e = jinja2.Environment(extensions = [jinja2.ext.do,])
>>> e.from_string({%do x.update({4:5})%} {{x}})render({'x':{1:2,2:3}})
你'{1:2,2:3,4:5}'
>>>
I have a Jinja2 dictionary and I want a single expression that modifies it - either by changing its content, or merging with another dictionary.
>>> import jinja2
>>> e = jinja2.Environment()
Modify a dict: Fails.
>>> e.from_string("{{ x[4]=5 }}").render({'x':{1:2,2:3}})
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "jinja2/environment.py", line 743, in from_string
return cls.from_code(self, self.compile(source), globals, None)
File "jinja2/environment.py", line 469, in compile
self.handle_exception(exc_info, source_hint=source)
File "<unknown>", line 1, in template
jinja2.exceptions.TemplateSyntaxError: expected token
'end of print statement', got '='
Two-stage update: Prints superfluous "None".
>>> e.from_string("{{ x.update({4:5}) }} {{ x }}").render({'x':{1:2,2:3}})
u'None {1: 2, 2: 3, 4: 5}'
>>> e.from_string("{{ dict(x.items()+ {3:4}.items()) }}").render({'x':{1:2,2:3}})
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "jinja2/environment.py", line 868, in render
return self.environment.handle_exception(exc_info, True)
File "<template>", line 1, in top-level template code
TypeError: <lambda>() takes exactly 0 arguments (1 given)
Use dict(x,**y)
: Fails.
>>> e.from_string("{{ dict((3,4), **x) }}").render({'x':{1:2,2:3}})
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "jinja2/environment.py", line 868, in render
return self.environment.handle_exception(exc_info, True)
File "<template>", line 1, in top-level template code
TypeError: call() keywords must be strings
So how does one modify the dictionary x
in Jinja2 by changing an attribute or merging with another dictionary?
This question is similar to: How can I merge two Python dictionaries as a single expression? -- insofar as Jinja2 and Python are analogous.
Sounds like the Jinja2 "do" statement extension may help. Enabling this extension would allow you to rewrite:
"{{ x.update({4:5}) }} {{ x }}"
as
"{% do x.update({4:5}) %} {{ x }}"
.
Example:
>>> import jinja2
>>> e = jinja2.Environment(extensions=["jinja2.ext.do",])
>>> e.from_string("{% do x.update({4:5}) %} {{ x }}").render({'x':{1:2,2:3}})
u' {1: 2, 2: 3, 4: 5}'
>>>
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