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POHow to use virtualenvwrapper from within a Python script
 

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  1. POHow to use virtualenvwrapper from within a Python script
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    <p>I have succesfully installed <code>virtualenv</code> and <code>virtualenvwrapper</code> on my system. It is working perfectly. For future convenience I want to create a script which installs all my favourite modules into an environment I name <code>pynumeric</code>, to be located in <code>~/.virtualenvs</code>. For this script I need to use <code>virtualenvwrapper</code> from wihtin my script. This, is unfortunately not working for me somehow. I keep on getting errors that <code>workon</code> and <code>mkvirtualenv</code> do not exist.</p> <p>So basically my question boils down to: Why does <code>virtualenvwrapper</code> work in a terminal and <strong>not</strong> from within my Python script?</p> <p><strong>install_pynumeric.py (EDIT)</strong></p> <pre><code>#!/usr/bin/python import os import sys import subprocess as sp # Set CPU frequency governer to performance #sp.check_call('cpuset gov performance', shell=True) # Check for parent directory of virtual environments if not os.path.isdir('/home/carlos/.virtualenvs'): sys.exit('The parent directory for virtual environments does not exist yet. Create it before preceeding.') # Create virtual environment pynumeric if it does not exist yet and activate if not os.path.isdir('/home/carlos/.virtualenvs/pynumeric'): sp.check_call('mkvirtualenv pynumeric', shell=True) # Activate pynumeric sp.check_call('workon pynumeric', shell=True) # List of Python modules to be installed modules = ['numpy', 'scipy', 'sympy', 'matplotlib', 'pyqt4', 'sphinx', 'rope', 'pyflakes', 'ipython', 'pylint', 'psutil', 'spyder', 'pydstool' ] # Install modules for m in modules: cmd = 'pip install ' + m sp.check_call(cmd, shell=True) # Deactivate pynumeric sp.check_call('deactivate', shell=True) # Set CPU frequency governer to ondemand #sp.check_call('cpuset gov ondemand', shell=True) </code></pre> <p>I get the following error now:</p> <pre><code>/bin/sh: mkvirtualenv: command not found Traceback (most recent call last): File "./install_pynumeric.py", line 16, in &lt;module&gt; sp.check_call('mkvirtualenv pynumeric', shell=True) File "/usr/lib/python2.7/subprocess.py", line 542, in check_call raise CalledProcessError(retcode, cmd) subprocess.CalledProcessError: Command 'mkvirtualenv pynumeric' returned non-zero exit status 127 </code></pre>
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