amcquistan / pynode

Node - Python Interop

PyNode

Call python code from node.js

Only tested with python 3.6.x and python 3.7.x. Probably wont work with Python 2.7

Installation

BEFORE NPM INSTALL OR YARN INSTALL

• Make sure python in your system PATH is the correct one: python --version
• Linux and Mac only: make sure python-config is also in your path and is from the correct python installation. You may have to symlink python3-config to /usr/local/bin.
• yarn add @fridgerator/pynode or npm install @fridgerator/pynode

Usage

In a python file test.py:

def add(a, b):
  return a + b

in node:

const pynode = require('@fridgerator/pynode')

// Workaround for linking issue in linux:
// https://bugs.python.org/issue4434
// if you get: `undefined symbol: PyExc_ValueError` or `undefined symbol: PyExc_SystemError`
pynode.dlOpen('libpython3.6m.so') // your libpython shared library

// optionally pass a path to use as Python module search path
pynode.startInterpreter()

// add current path as Python module search path, so it finds our test.py
pynode.appendSysPath('./')

// open the python file (module)
pynode.openFile('test')

// call the python function and get a return value
let x = pynode.call('add', 1, 2)
x === 3 // true