Modern template engine for Python 3.14t — AST-native, free-threading ready
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)彡 Kida
Modern template engine for Python 3.14t
from kida import Environment
env = Environment()
template = env.from_string("Hello, {{ name }}!")
print(template.render(name="World"))
# Output: Hello, World!
Why Kida?
- AST-native — Compiles to Python AST directly, no string generation
- Free-threading ready — Safe for Python 3.14t concurrent execution (PEP 703)
- Fast — Benchmarks on 3.14t: 3.6x (minimal), 1.7x (small), 1.1x (medium), ~1.0x (large), 1.2x (complex); cold-start +7-8% with bytecode cache (details in performance docs)
- Modern syntax — Pattern matching, pipeline operator, unified
{% end %} - Zero dependencies — Pure Python, includes native
Markupimplementation
Installation
pip install kida-templates
Requires Python 3.14+
Quick Start
| Function | Description |
|---|---|
Environment() |
Create a template environment |
env.from_string(src) |
Compile template from string |
env.get_template(name) |
Load template from filesystem |
template.render(**ctx) |
Render to string (StringBuilder, fastest) |
template.render_stream(**ctx) |
Render as generator (yields chunks) |
RenderedTemplate(template, ctx) |
Lazy iterable wrapper for streaming |
Features
| Feature | Description | Docs |
|---|---|---|
| Template Syntax | Variables, filters, control flow, pattern matching | Syntax → |
| Inheritance | Template extends, blocks, includes | Inheritance → |
| Filters & Tests | 40+ built-in filters, custom filter registration | Filters → |
| Streaming | Statement-level generator rendering via render_stream() |
Streaming → |
| Async Support | Native async for, await in templates |
Async → |
| Caching | Fragment caching with TTL support | Caching → |
| Partial Evaluation | Compile-time evaluation of static expressions | Advanced → |
| Block Recompilation | Recompile only changed blocks in live templates | Advanced → |
| Extensibility | Custom filters, tests, globals, loaders | Extending → |
📚 Full documentation: lbliii.github.io/kida
Usage
File-based Templates — Load from filesystem
from kida import Environment, FileSystemLoader
env = Environment(loader=FileSystemLoader("templates/"))
template = env.get_template("page.html")
print(template.render(title="Hello", content="World"))
Template Inheritance — Extend base templates
base.html:
<!DOCTYPE html>
<html>
<body>
{% block content %}{% end %}
</body>
</html>
page.html:
{% extends "base.html" %}
{% block content %}
<h1>{{ title }}</h1>
<p>{{ content }}</p>
{% end %}
Control Flow — Conditionals, loops, pattern matching
{% if user.is_active %}
<p>Welcome, {{ user.name }}!</p>
{% end %}
{% for item in items %}
<li>{{ item.name }}</li>
{% end %}
{% match status %}
{% case "active" %}
Active user
{% case "pending" %}
Pending verification
{% case _ %}
Unknown status
{% end %}
Filters & Pipelines — Transform values
{# Traditional syntax #}
{{ title | escape | capitalize | truncate(50) }}
{# Pipeline operator #}
{{ title |> escape |> capitalize |> truncate(50) }}
{# Custom filters #}
{{ items | sort(attribute="name") | first }}
Streaming Rendering — Yield chunks as they're ready
from kida import Environment
env = Environment()
template = env.from_string("""
<ul>
{% for item in items %}
<li>{{ item }}</li>
{% end %}
</ul>
""")
# Generator: yields each statement as a string chunk
for chunk in template.render_stream(items=["a", "b", "c"]):
print(chunk, end="")
# RenderedTemplate: lazy iterable wrapper
from kida import RenderedTemplate
rendered = RenderedTemplate(template, {"items": ["a", "b", "c"]})
for chunk in rendered:
send_to_client(chunk)
Works with inheritance ({% extends %}), includes, and all control flow. Blocks like {% capture %} and {% spaceless %} buffer internally and yield the processed result.
Async Templates — Await in templates
{% async for item in fetch_items() %}
{{ item }}
{% end %}
{{ await get_user() }}
Fragment Caching — Cache expensive blocks
{% cache "navigation" %}
{% for item in nav_items %}
<a href="{{ item.url }}">{{ item.title }}</a>
{% end %}
{% end %}
Jinja2 Comparison
| Feature | Kida | Jinja2 |
|---|---|---|
| Compilation | AST → AST | String generation |
| Rendering | StringBuilder + streaming generator | Generator yields only |
| Block endings | Unified {% end %} |
{% endif %}, {% endfor %} |
| Dict access | Subscript-first (d.items → key) |
getattr-first (d.items → method) |
| Profiling | Auto-instrumented blocks/filters/macros | N/A |
| Scoping | Explicit let/set/export |
Implicit |
| Async | Native async for, await |
auto_await() wrapper |
| Pattern matching | {% match %}...{% case %} |
N/A |
| Null coalescing | {{ a ?? b }} |
{{ a | default(b) }} |
| Optional chaining | {{ obj?.attr }} |
N/A |
| Pipeline syntax | {{ value |> filter }} |
{{ value | filter }} |
| Caching | {% cache key %}...{% end %} |
N/A (extension required) |
| Free-threading | Native (PEP 703) | N/A |
Architecture
Compilation Pipeline — AST-native
Template Source → Lexer → Parser → Kida AST → Compiler → Python AST → exec()
Unlike Jinja2 which generates Python source strings, Kida generates ast.Module objects directly. This enables:
- Structured code manipulation — Transform and optimize AST nodes
- Compile-time optimization — Dead code elimination, constant folding
- Precise error source mapping — Exact line/column in template source
Dual-Mode Rendering — StringBuilder + streaming generator
# render() — StringBuilder (fastest, default)
_out.append(...)
return "".join(_out)
# render_stream() — Generator (streaming, chunked HTTP)
yield ...
The compiler generates both modes from a single template. render() uses StringBuilder for maximum throughput (25-40% faster than Jinja2). render_stream() uses Python generators for statement-level streaming -- ideal for chunked HTTP responses and Server-Sent Events.
Thread Safety — Free-threading ready
All public APIs are thread-safe by design:
- Template compilation — Idempotent (same input → same output)
- Rendering — Uses only local state (StringBuilder pattern)
- Environment — Copy-on-write for filters/tests/globals
- LRU caches — Atomic operations
Module declares itself GIL-independent via _Py_mod_gil = 0 (PEP 703).
Performance
| Metric | Kida | Jinja2 | Improvement |
|---|---|---|---|
| Simple render | 0.12ms | 0.18ms | 33% faster |
| Complex template | 2.1ms | 3.2ms | 34% faster |
| Concurrent (8 threads) | 0.15ms avg | GIL contention | Free-threading |
Documentation
| Section | Description |
|---|---|
| Get Started | Installation and quickstart |
| Syntax | Template language reference |
| Usage | Loading, rendering, escaping |
| Extending | Custom filters, tests, loaders |
| Reference | Complete API documentation |
| Tutorials | Jinja2 migration, Flask integration |
Development
git clone https://github.com/lbliii/kida.git
cd kida
# Uses Python 3.14t by default (.python-version)
uv sync --group dev --python 3.14t
PYTHON_GIL=0 uv run --python 3.14t pytest
The Bengal Ecosystem
A structured reactive stack — every layer written in pure Python for 3.14t free-threading.
| ᓚᘏᗢ | Bengal | Static site generator | Docs |
| ∿∿ | Purr | Content runtime | — |
| ⌁⌁ | Chirp | Web framework | Docs |
| =^..^= | Pounce | ASGI server | Docs |
| )彡 | Kida | Template engine ← You are here | Docs |
| ฅᨐฅ | Patitas | Markdown parser | Docs |
| ⌾⌾⌾ | Rosettes | Syntax highlighter | Docs |
Python-native. Free-threading ready. No npm required.
License
MIT License — see LICENSE for details.
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