Flask - How to print different variables on the same page

Question

I'm trying to print out a list of entries, the total entry and the generated time in Flask. In my python code I have:

def stream_template(template_name, **context):
app.update_template_context(context)
t = app.jinja_env.get_template(template_name)
rv = t.stream(context)
return rv

@app.route('/', methods=['POST'])
def get_data():
    # Dong something here to prepare for data
    total_entry = get_total_entry()
    generated_time = get_generated_time()
    entry_list = get_entry()
    def blog_entries():
        for entry in entry_list:
            yield entry
    return Response(stream_template('blog.html', data=blog_entries()))

I have my blog_entry() as: (for testing purpose) return [for i in range(5)]

In the blog.html I have: (for the purpose of testing, let's consider each entry as an int)

{% for i in data: %}
<br>Entry: {{ i }}</br>
{% endfor %}

As a result, I would get the list of all the entries. However, I would like to also have the total_entry and generated_time print out before and on the same page of printing out the entries. How should I change my python code and html template?

Eg: i want to have something like:

Total entry: 5
Generated time: 0.001
Entry: 1
Entry: 2
Entry: 3
Entry: 4
Entry: 5

Thank you so much!

Answer 1

Just pass the variables as the **context keyword arguments. This should work but I haven't tested.

Here's the documentation for stream_template .

@app.route('/', methods=['POST'])
def get_data():
    # Dong something here to prepare for data
    def blog_entries():
        for entry in get_entry():
            yield entry
    return Response(stream_template('blog.html',
                                    data=blog_entries(),
                                    total_entries=get_total_entry(),
                                    gen_time=get_generated_time()))

The Jinja2 template. Changed the formatting to a list. You can access the **context keyword arguments in the Jinja2 -template by using the correct names.

<ul>
    <li>Total entries: {{ total_entries }}</li>
    <li>Generated time: {{ gen_time }}</li>
    {% for i in data: %}
    <li>Entry: {{ i }}</li>
    {% endfor %}
</ul>