Documentation: Add entry for Python on NuttX

This commit adds entries in the documentation referring to the
Python's port for NuttX.

Documentation/applications/interpreters/python/index.rst

@@ -0,0 +1,62 @@
+=============================
+``Python`` Python interpreter
+=============================
+
+This guide explains how to run Python on NuttX.
+
+*Yes, you heard it right*. **Python on NuttX**. This is a port of the `CPython <https://github.com/python/cpython>`_ repository for NuttX.
+The `CPython` repository is the reference implementation of the Python programming language.
+It is written in C and is the most widely used Python interpreter.
+
+.. warning::
+   Python for NuttX is still in the experimental stage (thus, it requires ``CONFIG_EXPERIMENTAL`` to be enabled)
+   It is not fully functional for all the architectures and configurations.
+   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.
+
+How Does it Work?
+=================
+
+1. Python for NuttX target initially the ``rv-virt`` (RISC-V QEMU) board.
+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.
+3. Environment variables like ``PYTHONHOME`` and ``PYTHON_BASIC_REPL`` need to be set accordingly.
+
+Building Python NuttX
+=====================
+
+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:
+
+.. code:: console
+
+   $ cd nuttx
+   $ make distclean
+   $ ./tools/configure.sh rv-virt:python
+   $ make -j$(nproc)
+   $ ls -l nuttx
+
+This will generate a ``nutxx`` binary. This file can be run using the RISC-V QEMU.
+
+Try Python in NSH
+=================
+
+.. code:: console
+
+   $ .qemu-system-riscv32 -semihosting -M virt,aclint=on -cpu rv32 -smp 1 -bios none -kernel nuttx -nographic
+
+   ABC
+   NuttShell (NSH) NuttX-10.4.0
+   nsh> mount_modules
+   Mounting ROMFS filesystem at target=/usr/local/lib/ with source=/dev/ram1
+   nsh> export PYTHONHOME /usr/local
+   nsh> export PYTHON_BASIC_REPL 1
+   nsh> python
+   Python 3.13.0 (main, Dec  4 2024, 17:00:42) [GCC 13.2.0] on nuttx
+   Type "help", "copyright", "credits" or "license" for more information.
+   >>>
+
+Demo
+----
+
+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.
+
+.. image:: https://asciinema.org/a/orkD8fKuahMEgQfBak9abliE4.svg
+   :target: https://asciinema.org/a/orkD8fKuahMEgQfBak9abliE4

Documentation/platforms/risc-v/qemu-rv/boards/rv-virt/index.rst

@@ -358,6 +358,14 @@ Configures the NuttShell (nsh) located at examples/nsh.  This NSH
 configuration is focused on low-level, command-line driver testing.
 This configuration is used for 32-bit RISC-V
 
+python
+------
+
+Enables the Python interpreter for NuttX. This configuration is based on `nsh`_.
+
+For more information on how to build and run Python on NuttX,
+please refer to the :doc:`Python Interpreter </applications/interpreters/python/index>` page.
+
 nsh64
 -----