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POIPython import failure and python sys.path in general
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  1. POIPython import failure and python sys.path in general
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    copied!<p>I'm following this <a href="http://isbullsh.it/2012/04/Embed-ipython-in-virtualenv/">post</a> to make one ipython rule all the virtualenvs.</p> <p>From what I understand, the main idea of the post is that when in a virtualenv, ipython can not find its modules.</p> <pre><code>(a-virtualenv)me@pc:~$ ipython Traceback (most recent call last): File "/usr/bin/ipython", line 19, in &lt;module&gt; from IPython.frontend.terminal.ipapp import launch_new_instance ImportError: No module named IPython.frontend.terminal.ipapp </code></pre> <p>To work around this, I add this to my /usr/bin/ipython</p> <pre><code>import sys if "/usr/lib/python2.7/dist-packages" not in sys.path: sys.path.append("/usr/lib/python2.7/dist-packages") </code></pre> <p>This trick works for Balthazar. But in my case, I get this</p> <pre><code>Traceback (most recent call last): File "/usr/bin/ipython", line 18, in &lt;module&gt; from IPython.frontend.terminal.ipapp import launch_new_instance File "/usr/lib/python2.7/dist-packages/IPython/__init__.py", line 46, in &lt;module&gt; from .frontend.terminal.embed import embed File "/usr/lib/python2.7/dist-packages/IPython/frontend/terminal/embed.py", line 37, in &lt;module&gt; from IPython.frontend.terminal.ipapp import load_default_config File "/usr/lib/python2.7/dist-packages/IPython/frontend/terminal/ipapp.py", line 38, in &lt;module&gt; from IPython.core.completer import IPCompleter File "/usr/lib/python2.7/dist-packages/IPython/core/completer.py", line 84, in &lt;module&gt; from IPython.utils import generics File "/usr/lib/python2.7/dist-packages/IPython/utils/generics.py", line 19, in &lt;module&gt; from IPython.external.simplegeneric import generic File "/usr/lib/python2.7/dist-packages/IPython/external/simplegeneric/__init__.py", line 4, in &lt;module&gt; from _simplegeneric import * ImportError: No module named _simplegeneric </code></pre> <p>I thought maybe I should add <code>/usr/lib/python2.7/dist-packages/IPython/external</code> to <code>sys.path</code> in <code>/usr/bin/ipython</code> as well. What I get is </p> <pre><code>Traceback (most recent call last): File "/usr/bin/ipython", line 18, in &lt;module&gt; from IPython.frontend.terminal.ipapp import launch_new_instance File "/usr/lib/python2.7/dist-packages/IPython/__init__.py", line 43, in &lt;module&gt; from .config.loader import Config File "/usr/lib/python2.7/dist-packages/IPython/config/loader.py", line 27, in &lt;module&gt; from IPython.utils.path import filefind, get_ipython_dir File "/usr/lib/python2.7/dist-packages/IPython/utils/path.py", line 24, in &lt;module&gt; from IPython.utils.process import system File "/usr/lib/python2.7/dist-packages/IPython/utils/process.py", line 27, in &lt;module&gt; from ._process_posix import _find_cmd, system, getoutput, arg_split File "/usr/lib/python2.7/dist-packages/IPython/utils/_process_posix.py", line 27, in &lt;module&gt; from IPython.utils import text File "/usr/lib/python2.7/dist-packages/IPython/utils/text.py", line 27, in &lt;module&gt; from IPython.external.path import path ImportError: cannot import name path </code></pre> <p>This error occurred on line 43 of <code>IPython/__init__py</code>, but the previous one occurred on line 46.</p> <ol> <li><p>How can I make ipython work with virtualenv?</p></li> <li><p>How can adding <code>/usr/lib/python2.7/dist-packages/IPython/external</code> to <code>sys.path</code> resulting a new error?</p></li> <li><p>What should I read to get a better understanding of python import path?</p></li> </ol> <p>Thanks!</p> <p>PS: normal IPython sys.path</p> <pre><code>['', '/usr/bin', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-linux2', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/usr/local/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages/PIL', '/usr/lib/python2.7/dist-packages/gst-0.10', '/usr/lib/python2.7/dist-packages/gtk-2.0', '/usr/lib/pymodules/python2.7', '/usr/lib/python2.7/dist-packages/ubuntu-sso-client', '/usr/lib/python2.7/dist-packages/ubuntuone-client', '/usr/lib/python2.7/dist-packages/ubuntuone-control-panel', '/usr/lib/python2.7/dist-packages/ubuntuone-couch', '/usr/lib/python2.7/dist-packages/ubuntuone-installer', '/usr/lib/python2.7/dist-packages/ubuntuone-storage-protocol', '/usr/lib/python2.7/dist-packages/IPython/extensions'] </code></pre>
 

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