Question

我在jinja遇到了一个奇怪的问题。看起来很简单，但我做对了。在包含{{tag["tag"] }}的jinja模板中，它回显{u'type': u'literal', u'value': u'tourism'}，但当我尝试使用{{tag["tag"]["value"] }}获取值时，我从以下字符中收到错误jinja2.exceptions.UndefinedError: 'dict object' has no attribute 'tag'：< / p>

Traceback (most recent call last):
  File "vocabularies.py", line 16, in <module>
    table_html = ontology_table.render(fields=["title","domain","tags","expressivity"],rows=table_data["data"])
  File "/usr/lib/python2.7/site-packages/Jinja2-2.7.3-py2.7.egg/jinja2/environment.py", line 969, in render
    return self.environment.handle_exception(exc_info, True)
  File "/usr/lib/python2.7/site-packages/Jinja2-2.7.3-py2.7.egg/jinja2/environment.py", line 742, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "<template>", line 42, in top-level template code
  File "/usr/lib/python2.7/site-packages/Jinja2-2.7.3-py2.7.egg/jinja2/environment.py", line 378, in getitem
    return obj[argument]
jinja2.exceptions.UndefinedError: 'dict object' has no attribute 'tag'

实际上我正在加载一个包含标签对象的json字符串，如

{"tags": [{"tagObj": {"type": "uri", "value": "http://ci.emse.fr/opensensingcity/ns/sca/tourism"}, "tag": {"type": "literal", "value": "tourism"}}]}

以下的jinja代码失败了我提供的stacktrace：

{% for tag in row["tags"]%}
    <span class="label label-info">{{tag["tag"]["value"] }}</span>
{% endfor %}

Answer 1

请尝试以下代码 -

{% for key, value in dict.iteritems() %}
            {{ key }}
            {{ value }}
{% endfor %}

Answer 2

tag = {"tags": [{"tagObj": {"type": "uri", "value": "http://ci.emse.fr/opensensingcity/ns/sca/tourism"}, "tag": {"type": "literal", "value": "tourism"}}]}

你可以使用tag['tags'][0]['tag']['value']获得价值以这种方式你的出局将是'tourism'。

在Jinja的Python字典

2 个答案: