Django模板无法循环defaultdict [英] Django template can't loop defaultdict

问题描述

import collections

data = [
  {'firstname': 'John', 'lastname': 'Smith'}, 
  {'firstname': 'Samantha', 'lastname': 'Smith'}, 
  {'firstname': 'shawn', 'lastname': 'Spencer'}, 
]

new_data = collections.defaultdict(list)

for d in data:
    new_data[d['lastname']].append(d['firstname'])

print new_data

以下是输出：

defaultdict(<type 'list'>, {'Smith': ['John', 'Samantha'], 'Spencer': ['shawn']})

这里是模板：

{% for lastname, firstname in data.items %}
  <h1> {{ lastname }} </h1>
  <p> {{ firstname|join:", " }} </p>
{% endfor %}

但我的模板中的循环不起作用。没有什么出现它甚至不给我一个错误。我如何解决这个问题？它应该显示姓氏与名字一样，如下所示：

But the loop in my template doesn't work. Nothing shows up. It doesn't even give me an error. How can i fix this? It's supposed to show the lastname along with the firstname, something like this:

<h1> Smith </h1>
<p> John, Samantha </p>

<h1> Spencer </h1>
<p> shawn </p>

推荐答案

尝试：

dict(new_data)

更好地使用iteritem而不是项目：）

and is better to use iteritems instead of items:)

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