PyExecJS (EOL)

End of life

This library is no longer maintananced. Bugs are not be fixed (even if
they are trivial or essential).

We suggest to use other library or to make a fork.

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.

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

Supported runtimes

First-class support (runtime class is provided and tested)

PyV8 <http://code.google.com/p/pyv8/>__ - A python wrapper for
Google V8 engine,
Node.js <http://nodejs.org/>__
PhantomJS <http://phantomjs.org/>__
Nashorn <http://docs.oracle.com/javase/8/docs/technotes/guides/scripting/nashorn/intro.html#sthref16>__
- Included with Oracle Java 8

Second-class support (runtime class is privided but not tested)

Apple JavaScriptCore - Included with Mac OS X
Microsoft Windows Script Host <http://msdn.microsoft.com/en-us/library/9bbdkx3k.aspx>__
(JScript)
SlimerJS <http://slimerjs.org/>__
Mozilla SpiderMonkey <http://www.mozilla.org/js/spidermonkey/>__

Installation

::

$ pip install PyExecJS

or

::

$ easy_install PyExecJS

Details

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)'

You can choose JavaScript runtime by execjs.get():

::

>>> default = execjs.get() # the automatically picked runtime
>>> default.eval("1 + 2")
3
>>> import execjs.runtime_names
>>> jscript = execjs.get(execjs.runtime_names.JScript)
>>> jscript.eval("1 + 2")
3
>>> import execjs.runtime_names
>>> node = execjs.get(execjs.runtime_names.Node)
>>> node.eval("1 + 2")
3

The pros of PyExecJS is that you do not need take care of JavaScript
environment. Especially, it works in Windows environment without
installing extra libraries.

One of cons of PyExecJS is performance. PyExecJS communicate JavaScript
runtime by text and it is slow. The other cons is that it does not fully
support runtime specific features.

PyV8 <https://code.google.com/p/pyv8/>__ might be better choice for
some use case.

License

Copyright (c) 2016 Omoto Kenji. Copyright (c) 2011 Sam Stephenson and
Josh Peek. (As a author of ExecJS)

Released under the MIT license. See LICENSE for details.

Changelog

1.5.0

Eased version requirement for six.

1.4.1

Fixed arguments of module-level functions.
Fixed bug of execution with pipe.
Fixed wrong excption is raised.

1.4.0

Fixed required libraries.
Fixed order of output of --print-available-runtimes.
Execute some JavaScript runtime with pipe/stdin (without temporary
file).

1.3.1

Fixed --print-available-runtimes fails in Python 2.7.

1.3.0

Added cwd argument.

1.2.0

Supported Python 3.5
Supported Nashorn(Java 8 JavaScript engine) as runtime
Dropped support for Python 2.6 and 3.2

1.1.0

Supported Python 3.4
Supported SlimerJS as runtime
Supported PhantomJS as runtime
Fixed JScript runtime on Windows 8

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.

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PyExecJS

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