(subset) is the source language for Pytra, which transpiles code into multiple target languages.
2026-03-02 | v0.6.0 Released
Version 0.6.0 was released, adding Scala as a supported target language.
2026-03-01 | v0.5.0 Released
Version 0.5.0 was released, adding Lua as a supported target language.
2026-02-28 | v0.4.0 Released
Version 0.4.0 was released, adding Ruby as a supported target language.
- Past News: docs/en/news/index.md
Pytra's features
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Python to multi-language transpiler
- Supports conversion to C++, C#, Rust, JavaScript, TypeScript, Go, Java, Swift, Kotlin, Ruby, Lua, Scala3, and PHP.
- Converts code to output in a form extremely close to the original source.
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Write Python code that targets C++-level output quality
intdefaults to 64-bit signed integer.- No dynamic typing.
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Simple language model
- Basically a subset of Python.
- Can be developed with existing tools such as VS Code.
- Drops multiple inheritance and keeps only single inheritance.
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High extensibility
- The transpiler core is implemented in Python, making extension and customization easy.
- The transpiler's own source code can be transpiled into other languages by this transpiler, enabling self-hosting.
We also prioritize practical operational benefits.
WARNING: This project is still under active development and may be far from production-ready. Review sample code first and use at your own risk.
WARNING: Do not expect entire Python applications to be portable as-is. A realistic expectation is: if the core logic you wrote in Python transpiles well, that is a good outcome.
Execution times for sample programs written in Python and their transpiled versions (unit: seconds). In the table, Python is the original code and PyPy is for reference.
| No. | Workload | Python | PyPy | C++ | Rust | C# | JS | TS | Go | Java | Swift | Kotlin | Ruby | Lua | Scala3 | PHP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 01 | Mandelbrot set (PNG) | 18.647 | 1.091 | 0.790 | 0.781 | 0.383 | 0.768 | 0.806 | 0.753 | 0.756 | 0.760 | 0.756 | 18.955 | 5.500 | 2.221 | 6.159 |
| 02 | Simple sphere ray tracer (PNG) | 6.890 | 0.529 | 0.202 | 0.165 | 0.918 | 0.277 | 0.288 | 0.256 | 0.260 | 0.289 | 0.258 | 11.146 | 3.049 | 15.765 | 2.372 |
| 03 | Julia set (PNG) | 22.770 | 1.959 | 0.861 | 0.823 | 1.468 | 1.210 | 1.127 | 1.126 | 1.136 | 1.125 | 1.151 | 37.170 | 8.162 | 7.935 | 5.700 |
| 04 | Orbit-trap Julia set (PNG) | 11.950 | 1.081 | 0.380 | 0.358 | 0.416 | 0.473 | 0.504 | 0.466 | 0.471 | 0.482 | 0.469 | 28.702 | 4.237 | 7.592 | 3.129 |
| 05 | Mandelbrot zoom (GIF) | 14.538 | 1.262 | 0.555 | 0.569 | 1.710 | 0.703 | 0.680 | 0.691 | 0.689 | 0.695 | 0.687 | 14.892 | 17.852 | 8.871 | 5.551 |
| 06 | Julia parameter sweep (GIF) | 9.627 | 0.507 | 0.546 | 0.407 | 0.329 | 0.626 | 0.619 | 0.622 | 0.621 | 0.624 | 0.629 | 10.704 | 11.122 | 11.067 | 3.694 |
| 07 | Game of Life (GIF) | 5.134 | 0.685 | 0.363 | 0.369 | 1.530 | 1.364 | 1.311 | 1.191 | 1.248 | 1.290 | 1.267 | 11.205 | 8.036 | 5.225 | 0.857 |
| 08 | Langton's Ant (GIF) | 5.220 | 0.767 | 0.452 | 0.483 | 2.213 | 2.031 | 1.997 | 1.912 | 2.011 | 1.886 | 2.019 | 18.824 | 10.367 | 6.446 | 2.218 |
| 09 | Flame simulation (GIF) | 10.895 | 1.167 | 0.611 | 0.661 | 6.566 | 2.374 | 2.290 | 2.368 | 2.265 | 2.306 | 2.358 | 32.077 | 18.097 | 18.956 | 2.356 |
| 10 | Plasma effect (GIF) | 6.194 | 0.876 | 0.684 | 0.554 | 2.646 | 1.444 | 1.886 | 1.397 | 1.414 | 1.444 | 1.319 | 11.745 | 7.806 | 4.525 | 1.994 |
| 11 | Lissajous particles (GIF) | 3.582 | 0.532 | 0.356 | 0.359 | 0.714 | 1.425 | 1.406 | 1.389 | 1.365 | 1.371 | 1.413 | 7.950 | 7.809 | 3.406 | 0.131 |
| 12 | Sorting visualization (GIF) | 3.864 | 0.552 | 0.344 | 0.362 | 0.680 | 1.341 | 1.343 | 1.309 | 1.348 | 1.328 | 1.306 | 8.087 | 7.078 | 4.057 | 0.233 |
| 13 | Maze generation steps (GIF) | 3.402 | 0.533 | 0.287 | 0.298 | 1.037 | 1.038 | 1.035 | 0.985 | 1.025 | 0.997 | 0.987 | 6.825 | 6.288 | 3.735 | 0.006 |
| 14 | Simple ray marching (GIF) | 2.670 | 0.300 | 0.160 | 0.159 | 0.606 | 0.489 | 0.573 | 0.490 | 0.513 | 0.503 | 0.492 | 3.800 | 3.370 | 2.138 | 0.864 |
| 15 | Wave interference loop (GIF) | 2.631 | 0.402 | 0.299 | 0.252 | 1.196 | 0.616 | 0.794 | 0.609 | 0.614 | 0.629 | 0.612 | 5.142 | 3.316 | 2.496 | 0.900 |
| 16 | Chaos rotation of glass sculpture (GIF) | 6.847 | 0.606 | 0.277 | 0.246 | 1.220 | 0.650 | 0.822 | 0.638 | 0.643 | 0.667 | 0.643 | 8.743 | 8.059 | 15.675 | - |
| 17 | Monte Carlo Pi approximation | 2.981 | 0.105 | 0.019 | 0.018 | 0.098 | 0.431 | 0.433 | 0.432 | 0.433 | 0.436 | 0.436 | 1.988 | 0.534 | 0.279 | 0.638 |
| 18 | Mini-language interpreter | 2.037 | 0.601 | 0.610 | 0.427 | 0.735 | 0.446 | 0.446 | 0.405 | 0.417 | 0.423 | 0.417 | 7.854 | 2.403 | 0.885 | - |
Sample code: 06_julia_parameter_sweep.py
- View full source: sample/py/06_julia_parameter_sweep.py
Transpiled code (C++ | Rust | C# | JavaScript | TypeScript | Go | Java | Swift | Kotlin | Ruby | Scala3 | PHP)
- C++: View full code
- Rust: View full code
- C#: View full code
- JavaScript: View full code
- TypeScript: View full code
- Go: View full code
- Java: View full code
- Swift: View full code
- Kotlin: View full code
- Ruby: View full code
- Scala3: View full code
- PHP: View full code
Sample code: 16_glass_sculpture_chaos.py
- View full source: sample/py/16_glass_sculpture_chaos.py
Transpiled code (C++ | Rust | C# | JavaScript | TypeScript | Go | Java | Swift | Kotlin | Ruby | Scala3 | PHP)
- C++: View full code
- Rust: View full code
- C#: View full code
- JavaScript: View full code
- TypeScript: View full code
- Go: View full code
- Java: View full code
- Swift: View full code
- Kotlin: View full code
- Ruby: View full code
- Scala3: View full code
- PHP: View full code
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