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run an embeded python interpreter in erlang

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README.rst

pynerl

status

I would really like to finish this, but for now it's on hold, if you would like to help, fork it and send pull requests.

about

pynerl is a set of NIFs that allow to run python code from erlang

the NIFs embed python and allow to run eval and call functions.

pynerl does the transformation of data types.

an example session:

1> pynerl:eval("t = 1", "t").
1
2> pynerl:eval("t = 1 * 2", "t").
2
3> pynerl:eval("import time;t = time.time()", "t").
1274236802.877999
4> pynerl:eval("import random;t = random.random()", "t").
0.45102117275294684
5> pynerl:eval("t = print('hello erlang or python')", "t").
hello erlang or python
                      none
6> pynerl:call("time", "time", []).
1274236859.510859
7> pynerl:call("random", "random", []).
0.9623136682858975
8> pynerl:eval("t = True", "t").
true
9> pynerl:eval("t = 2.3", "t").
2.3

Information

This is just an experiment, some of the code may be usable for other things but as the documentation on NIFs says:

Avoid doing lengthy work in NIF calls as that may degrade the
responsiveness of the VM. NIFs are called directly by the same
scheduler thread that executed the calling Erlang code. The calling
scheduler will thus be blocked from doing any other work until the NIF
returns.

That means that you shouldn't run a really long python method with it since it would block the scheduler.

I may try to make something similar to erlectricity

or erlv8

building

you will need a compiler, erlang dev files and python dev files, in debian based systems you get them with:

sudo apt-get install python3-dev erlang-dev build-essential

after that you may have to check that the paths in build.sh are the corrects for you, specially this two:

  • /usr/lib/erlang/erts-5.8.5/include/
  • /usr/include/python3.2/

if you have another version of erlang or python just change them on build.sh

if it gives some linker error check the -lpython3.2mu and change it to fit (maybe -lpython3.2)

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