Python Google App Engine Jinja2找不到包含

Question

I'm new to google app engine and python development and am trying to use Jinja2 as my templating engine. I have a page that I'm trying to "include" a header and footer on and I keep getting this error: TemplateNotFound: base/header.html

My code is below. Please let me know if you have any suggestions.

Python

JINJA_ENVIRONMENT = jinja2.Environment(
   loader=jinja2.FileSystemLoader(os.path.dirname(__file__)),
   extensions=['jinja2.ext.autoescape'])

class MainPage(webapp.RequestHandler):


    def get(self):
        template_values = {'title' : 'Test Value'}
        template = JINJA_ENVIRONMENT.get_template('/public/templates/index.html')
        self.response.write(template.render(template_values))

Configuration

libraries:
- name: webapp2
  version: latest
- name: jinja2
  version: latest

File Structure

- my application
  - public
    - scripts
    - stylesheets
    - templates
      - base
        - header.html
        - footer.html
      - index.html
  - app.yaml
  - myapplication.py

HTML (index.html)

{% include "base/header.html" %}
<nav class="top-bar" style="">
  <!-- more html here -->
</nav>
{% include "base/footer.html" %}

Answer 1

I have not used the loader property for jinja2 so i am not sure what this line does

loader=jinja2.FileSystemLoader(os.path.dirname(__file__))

But i do use App Engine successfully with jinja2 so i think i can help. I know by default jinja2 looks for a directory named "templates" in the root of you project. So for the header.html jinja2 would expect that file to be in "templates/base/header.html".

If you look in environment.py where the get_template function is for jinja2 if throws a

    If the template does not exist a :exc:`TemplateNotFound` exception is
    raised.

Create a templates directory in the root of your app engine project and move all jinja2 templates into there and let me know if that fixes it. When you pass the template names to jinja2 they will all be relative to the folder so call should look like

template = JINJA_ENVIRONMENT.get_template('index.html')

with index.html being in /templates/index.html in your root.

If it does i can show you how to customize the jinja2 default config by passing a dictionary to it.