62 lines
2.4 KiB
ReStructuredText
62 lines
2.4 KiB
ReStructuredText
=============================
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``Python`` Python interpreter
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=============================
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This guide explains how to run Python on NuttX.
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*Yes, you heard it right*. **Python on NuttX**. This is a port of the `CPython <https://github.com/python/cpython>`_ repository for NuttX.
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The `CPython` repository is the reference implementation of the Python programming language.
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It is written in C and is the most widely used Python interpreter.
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.. warning::
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Python for NuttX is still in the experimental stage (thus, it requires ``CONFIG_EXPERIMENTAL`` to be enabled)
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It is not fully functional for all the architectures and configurations.
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Please check this `issue <https://github.com/apache/nuttx-apps/issues/2884>`_ in the `nuttx-apps <https://github.com/apache/nuttx-apps/>`_ repository to know the current status.
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How Does it Work?
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=================
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1. Python for NuttX target initially the ``rv-virt`` (RISC-V QEMU) board.
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2. Python modules are stored in `pyc <https://docs.python.org/3/glossary.html#term-bytecode>`_ (byte-code format) and are loaded from a ROMFS image at startup.
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3. Environment variables like ``PYTHONHOME`` and ``PYTHON_BASIC_REPL`` need to be set accordingly.
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Building Python NuttX
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=====================
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Use the ``rv-virt:python`` config to build Python for NuttX. Note that the CMake scripts don't work for this configuration. For now, please use the makefile build instead:
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.. code:: console
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$ cd nuttx
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$ make distclean
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$ ./tools/configure.sh rv-virt:python
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$ make -j$(nproc)
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$ ls -l nuttx
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This will generate a ``nutxx`` binary. This file can be run using the RISC-V QEMU.
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Try Python in NSH
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=================
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.. code:: console
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$ .qemu-system-riscv32 -semihosting -M virt,aclint=on -cpu rv32 -smp 1 -bios none -kernel nuttx -nographic
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ABC
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NuttShell (NSH) NuttX-10.4.0
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nsh> mount_modules
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Mounting ROMFS filesystem at target=/usr/local/lib/ with source=/dev/ram1
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nsh> export PYTHONHOME /usr/local
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nsh> export PYTHON_BASIC_REPL 1
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nsh> python
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Python 3.13.0 (main, Dec 4 2024, 17:00:42) [GCC 13.2.0] on nuttx
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Type "help", "copyright", "credits" or "license" for more information.
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>>>
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Demo
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----
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Check the following `asciinema <https://asciinema.org/>`_ demo to see how to run Python on NuttX. You can copy and paste the commands from the demo to try it yourself.
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.. image:: https://asciinema.org/a/orkD8fKuahMEgQfBak9abliE4.svg
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:target: https://asciinema.org/a/orkD8fKuahMEgQfBak9abliE4
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