NPython

Python programming VM implemented in Nim.

Online playground demo ↓	Read API Docs
(by compiling Nim to Javascript)	Wiki about History

Purpose

• Fun and practice. Learn both Python and Nim.
• Serve as a altertive small version of CPython (as of 0.1.1, less than 2MB on release build mode)

How to use

Easiest installation

nimble install npython

Then you can use as if using python, e.g.

npython --version
npython -c "print('hello, NPython')"

Manually Install (e.g. JS backend)

Or you may wanna build for js backend or something else:

prepare

git clone https://github.com/nimpylib/npython.git
cd npython

NPython support C backend and multiply JS backends:

after build passing -h flag to npython and you will see help message

For a binary executable (C backend)

nimble build
bin/npython

For JS backend

• NodeJS: nimble buildJs -d:nodejs
• Deno: nimble buildJs -d:deno
• Browser, prompt&alert-based repl: nimble buildJs -d:jsAlert
• single page website: nimble buildKarax (requires nimble install karax). This is how online playground runs

Status

Capable of:

• flow control with if else, while, for, ...
• function (closure) defination and call. Decorators.
• builtin print, dir, len, range, tuple, list, dict, exceptions, etc.
• import such as import foo.
• raise exceptions, basic try ... except XXXError ... , with detailed traceback message. Assert statement.
• interactive mode and file mode
• ...

Check out ./tests to see more examples.

Todo

• integrate with nimpylib
• builtin compat dict
• better bigint lib
• ... ref Todo on Wiki