yte
A YAML template engine with Python expressions
Decision gist · record as of 2026-08-14
Yes, if you need to template YAML files and prefer Python expressions over a separate templating language. The low install friction, permissive license, and lack of security vulnerabilities make it a safe choice. The aging maintenance status is a minor concern—the project is stable and unarchived, but verify that the feature set and performance meet your needs before adopting it for critical workflows.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.8 or later (supports current versions up to Python 3.x).
- Low install friction with a pure-Python wheel.
- Maintenance status is aging—last release was 260 days ago—but the repository remains active and unarchived, suggesting the project is stable rather than abandoned.
License · maintenance · safety
MIT (permissive) — MIT license is permissive, allowing use in commercial and proprietary projects with minimal restrictions beyond attribution.
last release 2025-11-27 (260 days) · last repo commit 2025-11-27 · 44 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 168,818 downloads/mo, #10,434 on PyPI
Alternatives
Verify before relying
pip install yte
import yte
rendered = yte.render_string('key: ? 1 + 1')
print(rendered) # key: 2- Whether YTE's performance is suitable for large or deeply nested YAML files.
- How error messages and debugging experience compare to other YAML template engines.
- Whether the package is actively maintained or in maintenance-only mode given the 260-day gap since last release.
What it is and what it does
YTE is a template engine purpose-built for YAML that lets you embed Python expressions directly into YAML files to generate dynamic configurations. Instead of learning a separate templating syntax, you mark Python expressions with a `?` prefix anywhere in your YAML, and YTE evaluates them to produce plain YAML output. The key advantage is that YTE templates remain valid YAML files themselves—the `?` expressions are just strings to the YAML parser—and whitespace handling works naturally without the tuning required by generic engines like Jinja2.
The package depends on argparse-dataclass, dpath, and pyyaml to parse command-line arguments, navigate nested data structures, and handle YAML serialization. It's designed for developers who want to avoid learning a new templating language and prefer to write Python expressions in their YAML configurations instead.
Use it for
- Generate Kubernetes manifests or Docker Compose files with conditional blocks and loops based on deployment environment.
- Build configuration files for infrastructure-as-code tools where Python logic simplifies conditional sections.
- Template CI/CD pipeline definitions (GitHub Actions, GitLab CI) with dynamic job matrices and conditional steps.
- Create parameterized YAML schemas for application config where expressions compute derived values.
- Preprocess YAML data files with Python logic before passing them to downstream tools.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need to template YAML files and prefer Python expressions over a separate templating language.
The low install friction, permissive license, and lack of security vulnerabilities make it a safe choice. The aging maintenance status is a minor concern—the project is stable and unarchived, but verify that the feature set and performance meet your needs before adopting it for critical workflows.
Install
yte on PyPI
Before you install
Low install friction with a pure-Python wheel. Maintenance status is aging—last release was 260 days ago—but the repository remains active and unarchived, suggesting the project is stable rather than abandoned.
Requires Python 3.8 or later (supports current versions up to Python 3.x).
License in practice
MIT license is permissive, allowing use in commercial and proprietary projects with minimal restrictions beyond attribution.
Quickstart
pip install yte
import yte
rendered = yte.render_string('key: ? 1 + 1')
print(rendered) # key: 2Verify before relying
- Whether YTE's performance is suitable for large or deeply nested YAML files.
- How error messages and debugging experience compare to other YAML template engines.
- Whether the package is actively maintained or in maintenance-only mode given the 260-day gap since last release.
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release <4.0,>=3.8 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 3 packagesargparse-dataclassdpathpyyaml |
| Maintenance | Aging 260 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 168,818 / month, #10,434 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
Evidence: yte-1.9.4-py3-none-any.whl
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