ExeJS

---

Run JavaScript code from Python.

• Supported Runtime
• Installation
• Getting Started
• Reference
• Why
• Improvement & Change
• Excellent Case

Supported Runtime

ID	Runtime	Browser Engine	Team
1	Node	Chrome	Google
2	JavaScriptCore	Safari	Apple
3	SpiderMonkey	Firefox	Mozilla
4	JScript	IE	Microsoft
5	PhantomJS	Webkit*	Apple
6	SlimerJS	Gecko*	Mozilla
7	Nashorn	Java*	Oracle

Installation

# PYPI
pip install --upgrade exejs

# Conda
conda install conda-forge::exejs

# Source
git clone https://github.com/UlionTse/exejs.git
cd exejs
python setup.py install

Getting Started

import exejs

# evaluate:
print(exejs.evaluate("'red yellow blue'.split(' ')"))

# call:
print(exejs.compile('function add(x, y) { return x+y; }').call('add', 1, 2))

Reference

PyExecJS (EOL)

Why

1. We need to run javascript by python, but pyexecjs was EOL in 2018. Issue#1
2. Package builds that rely on pyexecjs will fail or be cancelled. Issue#2
3. Because pyexecjs will temporarily write compiled files by default, it will cause antivirus software to issue an alarm and block the program from running. Issue#3

Improvement and Change

1. Remove the interactive behavior of temporarily writing compiled code locally (except JScript), and replace it with just-in-time compilation and running.
2. Remove support for python2.

Excellent Case

ExeJS is currently an important dependency library of Translators.