我的for循环未获取值
[英]My for loop doesn't get the values
问题描述
Here's what I have: 
这是我所拥有的：
result = defaultdict(<type 'list'>,
{'USA': [{'username': 'user123', 'first-name': 'John', 'last-name': 'Doe'}],
'Europe': [{'username': 'myname654', 'first-name': 'Peter', 'last-name': 'Johnson'}]
})
Here's the output I want to get 这是我想要的输出
<html>
<body>
<h1> USA </h1>
<p> user123, John Doe</p>
<h1> Europe </h1>
<p> myname654, Peter Johnson</p>
</body>
</html>
I've tried tons of different for loops, but none of them worked. 我已经尝试了很多不同的for循环，但是没有一个起作用。
Here's what I have, but it doesn't work. 这是我所拥有的，但是不起作用。
{% for item in result %}
<h1> {{ item }} </h1>
<p> {{ result.item.username }} </p>
{% endfor %}
3 个解决方案
解决方案1
1 2011-01-19 22:42:42
Result is a dictionary. 结果是一本字典。 Iterating through a dictionary with for x in mydict just gives the keys, not the values. for x in mydict遍历字典仅给出键，而不是值。 So you need to do {% for item, value in mydict.items %} . 因此，您需要执行{% for item, value in mydict.items %} 。
Secondly, {{ result.item.username }} makes no sense at all. 其次， {{ result.item.username }}毫无意义。 item is a the value of a key into the result dict, but you can't do that sort of indirect lookups in Django templates. item是result字典中键的值，但是您不能在Django模板中进行这种间接查找。 However, luckily we have the value in the value variable. 但是，幸运的是我们在value变量中有value 。
Thirdly, as Kabie points out, each value is actually a single-element list. 第三，正如Kabie指出的那样，每个value实际上都是一个单元素列表。 So you'll need to access the first item in that list, and then the username member of that. 因此，您需要访问该列表中的第一项，然后访问该username成员。
Putting it all together: 放在一起：
{% for item, value in result.items %}
<h1> {{ item }} </h1>
<p> {{ value.0.username }} </p>
{% endfor %}
解决方案2
0 2011-01-19 20:47:36
You are using print to get output in your for loop. 您正在使用print在for循环中获取输出。 This first converts the object to a string. 这首先将对象转换为字符串。 Apparently the objects in this case is some sort of xml/html objects. 显然，在这种情况下，对象是某种xml / html对象。
From inside the Django template, you don't print. 从Django模板内部，您不进行打印。 You could try converting the objects to string via a str() call, but in general I have the feeling you are trying to make the templates do something that you shouldn't make templates to in the first place. 您可以尝试通过str()调用将对象转换为字符串，但是总的来说，我有一种感觉，您正在尝试使模板执行某些您不应该首先将模板创建的操作。
Try having a method on the model object that returns the string you want, and inserting that into the template instead. 尝试在模型对象上使用一种方法来返回所需的字符串，然后将其插入模板中。
解决方案3
0 2011-01-19 21:11:44
I think the line: 我认为这行：
<p> {{ result.item.username }} </p>
should be: 应该：
<p> {{ result.item.0.username }} </p>
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