ruamel.yaml.jinja2
jinja2 pre and post-processor to update with YAML
Decision gist · record as of 2026-08-14
No. The package is abandoned (last release 2021-09-23) with no known security vulnerabilities but also no maintenance path forward. If you need Jinja2 templating for YAML, consider rendering templates separately before YAML parsing, or evaluate actively maintained alternatives. Install only if you have an existing codebase already depending on it and cannot migrate.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python >=3.6.
- The package integrates with ruamel.yaml's round-trip processor.
- Installation is straightforward with no runtime dependencies.
License · maintenance · safety
MIT (permissive) — MIT license is permissive and imposes minimal restrictions—you can use, modify, and distribute the package freely in commercial and private projects with only attribution required.
last release 2021-09-23 (1786 days)
0 known vulnerabilities (OSV.dev, 2026-08-14) · 1,476,675 downloads/mo, #3,858 on PyPI
Alternatives
Verify before relying
pip install ruamel.yaml.jinja2
from ruamel.yaml import YAML
yaml = YAML()
data = yaml.load(open('template.yaml'))
yaml.dump(data, open('output.yaml', 'w'))- Whether ruamel.yaml is automatically installed as a dependency or must be manually installed.
- Current compatibility with recent Python versions given the last release was 2021-09-23.
- Whether the package works correctly with modern Jinja2 versions.
What it is and what it does
ruamel.yaml.jinja2 is a plugin that bridges Jinja2 templating and YAML by allowing you to embed template logic in YAML files without breaking YAML syntax before rendering. It works by rewriting Jinja2 constructs during loading, rendering the template, and then restoring the original structure during dumping. The key constraint is that you must use the same YAML instance for both loading and dumping to maintain the round-trip integrity.
The intended use case is updating hardcoded values in YAML configuration files while preserving the template logic itself—useful when the template part might only exist in comments or when you want to modify data without touching the templating layer. It integrates with the round-trip processor to maintain formatting and structure.
Use it for
- Update hardcoded configuration values in YAML files while preserving embedded Jinja2 template logic.
- Generate dynamic YAML configurations from templates without breaking YAML validity before rendering.
- Maintain YAML files with template logic in comments or conditional blocks that should not be modified during updates.
- Process YAML templates where the template syntax needs to coexist with valid YAML structure.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
No.
The package is abandoned (last release 2021-09-23) with no known security vulnerabilities but also no maintenance path forward. If you need Jinja2 templating for YAML, consider rendering templates separately before YAML parsing, or evaluate actively maintained alternatives. Install only if you have an existing codebase already depending on it and cannot migrate.
Install
ruamel-yaml-jinja2 on PyPI
Before you install
Installation is straightforward with no runtime dependencies. However, the package has been abandoned since 2021-09-23 with no updates since, so expect no bug fixes or maintenance going forward.
Requires Python >=3.6. The package integrates with ruamel.yaml's round-trip processor.
License in practice
MIT license is permissive and imposes minimal restrictions—you can use, modify, and distribute the package freely in commercial and private projects with only attribution required.
Quickstart
pip install ruamel.yaml.jinja2
from ruamel.yaml import YAML
yaml = YAML()
data = yaml.load(open('template.yaml'))
yaml.dump(data, open('output.yaml', 'w'))Verify before relying
- Whether ruamel.yaml is automatically installed as a dependency or must be manually installed.
- Current compatibility with recent Python versions given the last release was 2021-09-23.
- Whether the package works correctly with modern Jinja2 versions.
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.6 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Abandoned 1,786 days since the last release |
| First released | |
| Downloads | 1,476,675 / month, #3,858 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 4 - BetaIntended Audience :: DevelopersLicense :: OSI Approved :: MIT LicenseOperating System :: OS IndependentProgramming Language :: Python |
Evidence: ruamel.yaml.jinja2-0.2.7-py2.py3-none-any.whl
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