Install & Compatibility
Where this runs
tested against v0.11 · pip install
no network on importno background threads
Install × environment matrix
Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux
muslpy 3.10–3.920 runs
installs and imports cleanly · install 0.0s · import 0.666s · 66.3MB
glibcpy 3.10–3.920 runs
installs and imports cleanly · install 3.4s · import 0.603s · 67MB
65MB installed
● package 65MB
Code
Verified usage
Verified import paths — ran on the pinned version, not inferred.
render_block_to_string
✓ from render_block import render_block_to_string
render_block
✓ from render_block import render_block
✗ from render_block import render_block_to_response
The function name `render_block` was introduced in v0.11 to return an HttpResponse, replacing the prior implicit naming pattern if one were to guess.
This quickstart demonstrates how to use `render_block_to_string` to extract and render a specific block from a Django template, including support for template inheritance and context data. It first sets up minimal Django settings and then creates two dummy template files ('my_template.html' extending 'base_template.html') to illustrate the functionality. Finally, it renders different blocks from 'my_template.html' and prints the output.
import os
import django
from django.conf import settings
from django.template import Context, Template
from render_block import render_block_to_string
# Minimal Django settings for templating
settings.configure(
DEBUG=True,
TEMPLATES=[
{
'BACKEND': 'django.template.backends.django.DjangoTemplates',
'DIRS': [os.path.dirname(__file__)], # Look for templates in current directory
'APP_DIRS': True, # Allows Django to look for templates inside apps
},
],
SECRET_KEY='super-secret-key',
)
django.setup()
# Create a dummy template file (e.g., 'my_template.html')
with open('my_template.html', 'w') as f:
f.write("""
{% extends 'base_template.html' %}
{% block content %}
<h1>Welcome, {{ user.name }}!</h1>
<p>This is the content block.</p>
{% endblock %}
{% block footer %}
<p>© 2026</p>
{% endblock %}
""")
# Create a base template file (e.g., 'base_template.html')
with open('base_template.html', 'w') as f:
f.write("""
<!DOCTYPE html>
<html>
<head><title>{% block title %}My Site{% endblock %}</title></head>
<body>
{% block content %}<p>Default Content</p>{% endblock %}
{% block footer %}<p>Default Footer</p>{% endblock %}
</body>
</html>
""")
# Example usage of render_block_to_string
context = {'user': {'name': 'Alice'}}
rendered_content = render_block_to_string(
'my_template.html',
'content',
context=context
)
print("Rendered 'content' block:")
print(rendered_content.strip())
rendered_footer = render_block_to_string(
'my_template.html',
'footer'
)
print("\nRendered 'footer' block:")
print(rendered_footer.strip())
# Cleanup dummy files
os.remove('my_template.html')
os.remove('base_template.html')
Debug
Known issues
breakingVersion 0.10b1 (July 2024) dropped support for Python 3.7 and Django versions < 3.2, 4.0, and 4.1. Ensure your environment meets the new minimums of Python >=3.9 and Django >=4.2.fixUpgrade Python to 3.9+ and Django to 4.2+ or pin `django-render-block` to `<0.10`.
affects: 0.10b1 and later
breakingEarlier versions significantly dropped support for older Python and Django. Version 0.9.2 (Oct 2022) dropped Python 3.6, and 0.7 (Jul 2020) dropped Python 2.7 and Django < 2.2.fixConsult the changelog for your specific `django-render-block` version and align your Python/Django environment accordingly.
affects: 0.7, 0.9.2, and later
gotcha`django-render-block`'s Jinja2 templating engine support is partial; it does not currently process the `extends` tag for Jinja2 templates.fixWhen using Jinja2, ensure that `render_block_to_string` is called on a template that does not rely on Jinja2's `extends` for the block you wish to render, or consider alternative solutions for Jinja2 partial rendering (e.g., `django-jinja-render-block`).
affects: 0.4 and later
gotchaA regression in v0.8 caused `Context` objects passed as the `context` parameter to `render_block_to_string` to not be forwarded, leading to incorrect rendering. This was fixed in v0.8.1.fixUpgrade to `django-render-block` v0.8.1 or newer to ensure correct context forwarding.
affects: 0.8
Errors
Common errors & fixes
render_block.exceptions.BlockNotFound: Block 'my_non_existent_block' not found in template 'my_template.html'
The specified `block_name` does not exist in the provided template.
fixDouble-check the `block_name` string for typos and ensure the block is defined in the template or any parent templates being extended.
django.template.exceptions.TemplateDoesNotExists: my_non_existent_template.html
The template path provided to `render_block_to_string` or `render_block` is incorrect or the template is not accessible via Django's configured template loaders.
fixVerify the `template_name` string for typos, ensure the file exists at the expected path, and that Django's `TEMPLATES` settings (specifically `DIRS` and `APP_DIRS`) correctly point to your template directories.
render_block.exceptions.UnsupportedEngine: Only DjangoTemplates is supported.
You are attempting to use `django-render-block` with a template backend other than Django's built-in `DjangoTemplates`, for which it has limited or no support.
fixEnsure your template is being processed by the `DjangoTemplates` backend. If you are intentionally using another engine (like Jinja2), be aware of the limitations or consider alternative libraries if the functionality is not met.
ModuleNotFoundError: No module named 'render_block'
The `django-render-block` package is either not installed in your active Python environment or you have an incorrect import statement.
fixRun `pip install django-render-block` to install the package. Verify that your import statement is `from render_block import render_block_to_string` (or `render_block`).
Upgrade
Version history
0.11latest on PyPI · released May 13, 2025
Audit
Dependencies
DjangorequiredRequired for Django template integration. Supports Django 4.2, 5.1, and 5.2.