PyExecJS
Run JavaScript code from Python.
PyExecJS is a porting of ExecJS from Ruby. PyExecJS automatically picks the best runtime available to evaluate your JavaScript program, then returns the result to you as a Python object.
A short example:
>>> import execjs
>>> execjs.eval("'red yellow blue'.split(' ')")
['red', 'yellow', 'blue']
>>> ctx = execjs.compile("""
... function add(x, y) {
... return x + y;
... }
... """)
>>> ctx.call("add", 1, 2)
3
Of course, you can pick particular JavaScript runtime by get() function:
>>> default = execjs.get() # the automatically picked runtime
>>> default.eval("1 + 2")
3
>>> jscript = execjs.get("JScript")
>>> jscript.eval("1 + 2")
3
>>> node = execjs.get("Node")
>>> node.eval("1 + 2")
3
If EXECJS_RUNTIME environment variable is specified, PyExecJS pick the JavaScript runtime as a default:
>>> #execjs.get().name # this value is depends on your environment. >>> os.environ["EXECJS_RUNTIME"] = "Node" >>> execjs.get().name 'Node.js (V8)'
PyExecJS supports these runtimes:
PyV8 - A python wrapper for Google V8 engine,
Apple JavaScriptCore - Included with Mac OS X
Microsoft Windows Script Host (JScript)
Installation
$ pip install PyExecJS
or
$ easy_install PyExecJS
License
Copyright (c) 2012 Omoto Kenji. Copyright (c) 2011 Sam Stephenson and Josh Peek.
Released under the MIT license. See LICENSE for details.
Changes
1.0.5
Supported Python 3.3
Fixed file handle leaking
Fixed issue with passenger-nginx-4.0
1.0.4
Removed “import execjs” (it prevent execution of setup.py by Python 2.6)
1.0.3
Javascript sources were embeded in init.py. ‘which’ command were reimplemented by pure python.
1.0.2
Python 2.6.x was supported.
1.0.1
Forgotten shell=True was added to Popen.
1.0.0
First release.
1 maintainer
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