LPython is a Python compiler. It is in heavy development, currently in pre-alpha stage. Some of the goals of LPython:

• The best possible performance for numerical array oriented code
• Run on all platforms
• Compile a subset of Python and be Python compatible
• Explore how to design it so that it can be eventually used with any Python code
• Fast compilation
• Excellent user friendly diagnostic messages: error, warnings, hints, notes, etc.
• Ahead of time compilation to binaries and interactive usage (Jupyter notebook)
• Able to transform the Python code to C++, Fortran and other languages

And more.

LPython works on Windows, macOS and Linux.

If you do not have Conda already installed, please follow the instructions here to install Conda on your platform:

https://github.com/conda-forge/miniforge/#download

Create a Conda environment:

conda create -n lp llvmdev=11.0.1 bison=3.4 re2c python cmake make toml
conda activate lp

Clone LPython

git clone https://github.com/lcompilers/lpython.git
cd lpython

Create autogenerated files (choose the command for your platform):

./build0.sh      # macOS/Linux
call build0.bat  # Windows

Compile LPython:

cmake -DCMAKE_BUILD_TYPE=Debug -DWITH_LLVM=yes -DWITH_STACKTRACE=yes -DWITH_LFORTRAN_BINARY_MODFILES=no .
cmake --build . -j16

Run tests:

ctest
./run_tests.py

You can run the following examples by hand in a terminal:

./src/bin/lpython examples/expr2.py
./a.out
./src/bin/lpython --show-ast examples/expr2.py
./src/bin/lpython --show-asr examples/expr2.py
./src/bin/lpython --show-cpp examples/expr2.py
./src/bin/lpython --show-llvm examples/expr2.py