Jinja2 inheritance outside of Flask

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J Grimmtooth

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Nov 19, 2018, 5:56:38 PM11/19/18

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I'm using Jinja2 in situations where I'm either just generating a report to email out (most cases) or in a non-Flask web environment (twisted if it matters). Some of my templates are getting a little complicated and I'm starting to refactor them out to move blocks of code into separate files. But I'm having problems with inheritance. I've boiled it down to as simple a test as I can.

Main template, 'index-template.html':

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="refresh" content="420" >
    <title>jTest</title>
</head>
<body>

{% block testing %}This is a test.{% endblock %}

</body>
</html>

Here is the child template that contains the 'testing' block to replace the parent's block.

{% extends 'index-template.html' %}
{% block testing %}
    This is not a test.
{% endblock %}

And here is the code that uses it:

from jinja2 import FileSystemLoader, Environment

jLoader = FileSystemLoader("templates")
jEnv = Environment(loader=jLoader)
indexTemplate = jEnv.get_template('index-template.html')

jContent = indexTemplate.render()

with open("index.html", "w") as fp:
    fp.write(jContent)

index.html ends up like this:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="refresh" content="420" >
    <title>jTest</title>
</head>
<body>

This is a test.

</body>
</html>

Was expecting "this is not a test"

I feel like I'm missing something very fundamental here. Any pointers?

TIA,

Jeff

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