Question

示例：使用Flask和Jinja传递test以在模板中打印它。

@app.route('/mypage')
def mypage():        
    # just open the json file and read it...    
    input_file  = file(FILE, "r")
    j = json.loads(input_file.read().decode("utf-8-sig"))
    for item in j[:]:
        test = "test"       

    return render_template('mypage.html', j=j, test = test, config = {'environment_args':{'autoescape':False}})

注意j[:]

现在当我想在HTML文件中打印它时：

<p>{{test}}</p>

结果是：

None

更新：这是json文件的示例：

[
    {
        "trailers": {
            "quicktime": [], 
            "youtube": [
                {
                    "source": "FZCxSiYRh7Q", 
                    "type": "Trailer", 
                    "name": "Trailer 1", 
                    "size": "Standard"
                }
            ], 
            "id": 54315
        }, 
        "date": "2008", 
        "genres": [
            {
                "id": 18, 
                "name": "Drame"
            }
        ], 
        "tagline": "", 
        "popularity": 0.23, 
        "vote_count": 2, 
        "start": "Monday 09 December 01:10", 
        "length": "95", 
        "overview": "", 
        "vote_average": 10.0, 
    }, 

    {etc}
]

Answer 1

您显示的JSON似乎有错误 - 最后一个数字后面的逗号。以下是一个适合我的例子：

#app.py
from flask import Flask, render_template, json

app = Flask(__name__)


@app.route('/')
def mypage():
    # just open the json file and read it...
    input_file = file('file.json', "r")
    j = json.loads(input_file.read().decode("utf-8-sig"))
    for item in j[:]:
        print item
        test = "test"

    return render_template('index.html', j=j, test=test, config={'environment_args': {'autoescape': False}})


if __name__ == '__main__':
    app.run(debug=True)

示例HTML模板，渲染测试变量，并迭代JSON结构以打印每个开始日期：

<!-- index.html -->
<html>
    <body>
        {{ test }}
        {% for row in j %}
            <li>{{ row.start }}</li>
        {% endfor %}
    </body>
</html>

只是为了完整性 - 我使用的JSON文件。

[
    {
        "trailers": {
            "quicktime": [],
            "youtube": [
                {
                    "source": "FZCxSiYRh7Q",
                    "type": "Trailer",
                    "name": "Trailer 1",
                    "size": "Standard"
                }
            ],
            "id": 54315
        },
        "date": "2008",
        "genres": [
            {
                "id": 18,
                "name": "Drame"
            }
        ],
        "tagline": "",
        "popularity": 0.23,
        "vote_count": 2,
        "start": "Monday 09 December 01:10",
        "length": "95",
        "overview": "",
        "vote_average": 10.0
    }
]

迭代列表副本时的异常行为

1 个答案: