Created — forked from minrk/shebang.py

Embed URL

HTTPS clone URL

SSH clone URL

You can clone with HTTPS or SSH.

Download Gist

Prototype of an extension to provide acess to virtual python environment on an IPython notebook cell

View test_virtualenvmagic.py
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
# -*- coding: utf-8 -*-
 
import os
import nose.tools as nt
from IPython.core.interactiveshell import InteractiveShell
 
def setup():
ip = InteractiveShell()
ip.extension_manager.load_extension('virtualenvmagic')
def test_virtualenv():
ip = InteractiveShell()
result = ip.run_cell_magic('virtualenv','my_env','import sys; print sys.version')
nt.assert_true(result.startswith('2.7.3'))
View test_virtualenvmagic.py
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
"""
Virtualenv magic
Requires virtualenv and virtualenv Wrapper
"""
import sys
import os
import shlex
from subprocess import Popen, PIPE
from IPython.core.magic import cell_magic
from IPython.core.interactiveshell import InteractiveShell
 
@cell_magic('virtualenv')
def virtualenv(line, cell):
"""
This magic enables the excution of the code of the cell on a
pre-existing virtualenv.
Usage
=====
To activate this magic just write at the top of the cell:
%% virtualenv my_env
"""
if not os.path.exists(os.environ['WORKON_HOME']+line):
print >> sys.stderr, "Environment {} does no exist.".format(line)
return
env_activate_cmd = 'bash -c source '+os.environ['WORKON_HOME'] + '/{}/bin/activate'.format(line)
cmd = shlex.split(env_activate_cmd) + ["&&","python","-"]
p = Popen(cmd, stdout=PIPE, stderr=PIPE, stdin=PIPE, shell=True)
out,err = p.communicate(cell)
if err:
print >> sys.stderr, err
return out
 
if 'WORKON_HOME' in os.environ:
#~ get_ipython().register_magic_function(virtualenv, 'cell')
InteractiveShell().register_magic_function(virtualenv, 'cell')
 
 
Owner

@minrk : Would this be a start of a virtualenv cell?

it requires virtualenv to be installed and the env to exist prior to using this

Rather than calling get_ipython() or InteractiveShell(), an IPython extension should offer a load_ipython_extension(ip) method, which will be called with the shell object when it's loaded. Docs: http://ipython.org/ipython-doc/stable/config/extensions/index.html

(The rationale for this is that we have a long term goal to allow more than one InteractiveShell object in the same process - so we're trying not to treat it like a singleton)

Owner

I'll study other extensions and modify my code to conform.
thanks @takluyver

Owner

Thanks @turicas for the tip on how to make the bash command work...

@fccoelho, PEP8, please! :-)

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Something went wrong with that request. Please try again.