jruntime 0.2.0.post1

Python extension that interacts with the J language

jruntime is a modern Python extension that interacts with the J language. It provides deep integration between Python and J in the following ways:

• Takes over J engine I/O with Python I/O

• Maps between J arrays and NumPy ndarrays, J boxes and Python tuples

• Binds J nouns to lexical scopes using Python with statements

• Handles J errors using Python exceptions

• Emits the complete API document in help(jruntime)

Getting Started

Install jruntime and NumPy from PyPI:

pip install jruntime numpy

Now you can run J code and read data in NumPy arrays:

>>> import jruntime
>>> j = jruntime.Session()
>>> j.runsource('v =: 3 4 $ i.12')
>>> j['v']
array([[ 0,  1,  2,  3],
       [ 4,  5,  6,  7],
       [ 8,  9, 10, 11]], dtype=int64)

Or put Python data in J and run code that uses it:

>>> with j.let(title='Price', v=[.99, 1.48, 0.26]):
...     j.runsource('title;+/ v')
+-----+----+
|Price|2.73|
+-----+----+