当Python代码放在​​Django模板中时，语法错误 [英] Syntax error whenever I put Python code inside a Django template

问题描述

  {％嵌入嵌入％} $ b我想在Django模板中执行以下操作： $ b {％embed2 = embed.replace（&，<）％} 
 {{embed2}}< br /> 
 {％endfor％} 
  

但是，我总是得到一个无效的块或一些语法错误当我做这样的事情（我的意思是循环中的{％％}代码）。 Python没有{}表示范围，所以我认为这可能是我的问题？我的格式化我的代码错误？

编辑：确切的错误是：无效的块标签：'embed2' / p>

编辑2：由于有人说我在做什么是Django模板不支持的，我重写了代码，将逻辑放在视图中。我现在有：

  embed_list = [] 
嵌入嵌入：
 embed_list [len（embed_list ）：] = [embed.replace（&，<）] #this是第35行
返回render_to_response（scanvideos.html，{
embed_list：embed_list 
}）
  

但是，我现在得到一个错误： noneType'object is not callableon line 35 。

解决方案

而不是使用片段分配增加列表

embed_list [len（embed_list）：] = [foo]

你应该可以做

embed_list.append（foo）

但是，您真的应该尝试使用库函数来转义html，而不是自己执行。

NoneType错误听起来像嵌入.replace在某个时候是None，只有当你的列表不是一个字符串列表时才有意义 - 你可能希望用一些断言或者一些si milar。

I'm trying to do the following in my Django template:

    {% for embed in embeds %}
           {% embed2 = embed.replace("&lt;", "<") %}
           {{embed2}}<br />
    {% endfor %}

However, I always get an invalid block or some syntax error when I do anything like that (by that I mean {% %} code inside a loop). Python doesn't have {} to signify "scope" so I think this might be my problem? Am I formatting my code wrong?

Edit: the exact error is: Invalid block tag: 'embed2'

Edit2: Since someone said what I'm doing is not supported by Django templates, I rewrote the code, putting the logic in the view. I now have:

embed_list = []
for embed in embeds:
    embed_list[len(embed_list):] = [embed.replace("&lt;", "<")] #this is line 35
return render_to_response("scanvideos.html", {
    "embed_list" :embed_list
})

However, I now get an error: 'NoneType' object is not callable" on line 35.

解决方案

Instead of using a slice assignment to grow a list

embed_list[len(embed_list):] = [foo]

you should probably just do

embed_list.append(foo)

But really you should try unescaping html with a library function rather than doing it yourself.

That NoneType error sounds like embed.replace is None at some point, which only makes sense if your list is not a list of strings - you might want to double-check that with some asserts or something similar.

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