Jinja2 - 如何循环json列表？

Question

如何使用jinja2循环json列表？

我有这个json列表,

[{"first_name":"John","last_name":"Smith","user_id":4,"address":null},{"first_name":"Jane","last_name":"Heart","user_id ":5,"address":null},{"first_name":"Dom","last_name":"Robinsons","user_id":6,"address":null},{"first_name":"Pete", "last_name":"手","user_id":7,"地址":null}]

page.html中,

[
    {
        "first_name": "John",
        "last_name": "Smith",
        "user_id": 4,
        "address": null
    },
    {
        "first_name": "Jane",
        "last_name": "Heart",
        "user_id": 5,
        "address": null
    },
    {
        "first_name": "Dom",
        "last_name": "Robinsons",
        "user_id": 6,
        "address": null
    },
    {
        "first_name": "Pete",
        "last_name": "Hand",
        "user_id": 7,
        "address": null
    }
]

结果,

<table>
   {% for user in users %}
   <tr><td>{{ user.first_name }}</td></tr>
   {% endfor %}
</table>

有任何想法吗？

Answer 1

你的json列表包含字典; 你需要以不同于类成员的方式访问字典元素; 尝试:

<tr><td>{{ user['first_name'] }}</td></tr>

这对我有用(python 3.4和python 2.7)

import json
from jinja2 import Template

json_str = '''[{"first_name": "John", "last_name": "Smith", "user_id": 4, 
    "address": null}, {"first_name": "Jane", "last_name": "Heart",
    "user_id": 5, "address": null}, {"first_name": "Dom",
    "last_name": "Robinsons", "user_id": 6, "address": null},
    {"first_name": "Pete", "last_name": "Hand", "user_id": 7,
    "address": null}]'''

users = json.loads(json_str)

tmpl = Template('''
<table>
   {% for user in users %}
   <tr><td>{{ user['first_name'] }}</td></tr>
   {% endfor %}
</table>
''')

print(tmpl.render(users = users))

输出:

<table>

   <tr><td>John</td></tr>

   <tr><td>Jane</td></tr>

   <tr><td>Dom</td></tr>

   <tr><td>Pete</td></tr>

</table>