yaneurao / Pytra

Pytra (subset) is the source language for Pytra, which transpiles code into multiple target languages. Read the Docs PowerShell, Dart, and Julia are currently in progress. Latest News > **2026-03-11 | v0.13.0 Released** > Version 0.13.0 was released. I wrote an NES (Famicom) emulator in Python + SDL3. Super Mario Bros. 3 is running. It is very slow. I am currently improving Pytra so this can be transpiled to C++ with Pytra. > **2026-03-10 | v0.12.0 Released** > Version 0.12.0 was released. I am currently in the middle of a large runtime reorganization. > **2026-03-09 | v0.11.0 Released** > Version 0.11.0 was released. We are revisiting object boundaries, and the tutorial has been improved. > **2026-03-08 | v0.10.0 Released** > Version 0.10.0 was released. is now available, and runtime support for each target language is currently being refined. • Past News: docs/en/news/index.md • Current backend parity status: docs/en/language/backend-parity-matrix.md • Current backend test green status: docs/en/language/backend-test-matrix.md Features Pytra's features • 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. • Write Python code that targets C++-level output quality • defaults to 64-bit signed integer. • No dynamic typing. • 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. • 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. Runtime Performance Comparison 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|3.987| |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|1.718| 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 Read the Docs • English tutorial: docs/en/tutorial/README.md • English docs top: docs/en/index.md • Japanese tutorial: docs/ja/tutorial/README.md • Japanese docs top: docs/ja/README.md License Apache License 2…