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POwhich and type show different paths to IPython executable in virtualenv, import fails in IPython, succeeds in standard interpreter?
 

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  1. POwhich and type show different paths to IPython executable in virtualenv, import fails in IPython, succeeds in standard interpreter?
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    <pre><code>(myvirtualenv)[~] sam@iota $ type ipython ipython is hashed (/usr/local/bin/ipython) (myvirtualenv)[~] sam@iota $ which ipython /Users/sam/.virtualenvs/myvirtualenv/bin/ipython </code></pre> <h3>regardless of what <code>which</code> says, it executes <code>/usr/local/bin/ipython</code></h3> <pre><code>(myvirtualenv)[~] sam@iota $ ipython </code></pre> <pre><code>WARNING: Attempting to work in a virtualenv. If you encounter problems, please install IPython inside the virtualenv. Python 2.7.5 (default, Sep 6 2013, 17:51:18) IPython 1.1.0 -- An enhanced Interactive Python. In [1]: import novaclient --------------------------------------------------------------------------- Exception Traceback (most recent call last) &lt;ipython-input-1-93e5b70cb5b9&gt; in &lt;module&gt;() ----&gt; 1 import novaclient /Users/sam/.virtualenvs/myvirtualenv/lib/python2.7/site-packages/novaclient/__init__.py in &lt;module&gt;() 16 17 ---&gt; 18 __version__ = pbr.version.VersionInfo('python-novaclient').version_string() /Users/sam/.virtualenvs/myvirtualenv/lib/python2.7/site-packages/pbr/version.pyc in version_string(self) 70 if self.version is None: 71 parts = [] ---&gt; 72 for part in self.release_string().split('.'): 73 if part[0].isdigit(): 74 parts.append(part) /Users/sam/.virtualenvs/myvirtualenv/lib/python2.7/site-packages/pbr/version.pyc in release_string(self) 62 63 if self.release is None: ---&gt; 64 self.release = self._get_version_from_pkg_resources() 65 66 return self.release /Users/sam/.virtualenvs/myvirtualenv/lib/python2.7/site-packages/pbr/version.pyc in _get_version_from_pkg_resources(self) 55 # installed into anything. Revert to setup-time logic. 56 from pbr import packaging ---&gt; 57 return packaging.get_version(self.package) 58 59 def release_string(self): /Users/sam/.virtualenvs/myvirtualenv/lib/python2.7/site-packages/pbr/packaging.pyc in get_version(package_name, pre_version) 820 if version: 821 return version --&gt; 822 raise Exception("Versioning for this project requires either an sdist" 823 " tarball, or access to an upstream git repository." 824 " Are you sure that git is installed?") Exception: Versioning for this project requires either an sdist tarball, or access to an upstream git repository. Are you sure that git is installed? </code></pre> <h3>now forcing it to execute <code>/Users/sam/.virtualenvs/myvirtualenv/bin/ipython</code></h3> <pre><code>(myvirtualenv)[~] sam@iota $ `which ipython` </code></pre> <pre><code>Python 2.7.5 Type "copyright", "credits" or "license" for more information. IPython 1.1.0 -- An enhanced Interactive Python. In [1]: import novaclient In [2]: print "all is well here" all is well here </code></pre> <pre><code>(myvirtualenv)[~] sam@iota $ echo $PATH /Users/sam/.virtualenvs/myvirtualenv/bin:/usr/local/sbin:/usr/local/lib:/usr/bin:/bin:/usr/sbin:/sbin:/opt/X11/bin (myvirtualenv)[~] sam@iota $ python </code></pre> <pre><code>Python 2.7.5 (default, Sep 6 2013, 17:51:18) [GCC 4.2.1 Compatible Apple LLVM 4.2 (clang-425.0.24)] on darwin Type "help", "copyright", "credits" or "license" for more information. &gt;&gt;&gt; import novaclient &gt;&gt;&gt; print "all is well here" all is well here &gt;&gt;&gt; exit() </code></pre> <p>Why do <code>which</code> and <code>type</code> point to different paths? Why, if IPython is installed in my virtualenv, does the system IPython get executed, even though the order of my <code>$PATH</code> would indicate otherwise? In any case, why does <code>import novaclient</code> bomb out with what seems to be a pretty bizarre error?</p> <hr> <h2>EDIT</h2> <h2>pythonpath from erroneous session</h2> <p><code>(myvirtualenv)[~] sam@iota $ ipython -c 'import sys;sys.path'</code></p> <pre><code>['/Users/sam/.virtualenvs/myvirtualenv/lib/python2.7/site-packages', '', '/usr/local/bin', '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/setuptools-1.1-py2.7.egg', '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pip-1.4.1-py2.7.egg', '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python27.zip', '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7', '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin', '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac', '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages', '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk', '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old', '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload', '/Library/Python/2.7/site-packages', '/usr/local/lib/python2.7/site-packages', '/usr/local/lib/python2.7/site-packages/IPython/extensions'] </code></pre> <h2>pythonpath from successful session</h2> <p><code>(myvirtualenv)[~] sam@iota $ python -c 'import sys;print sys.path'</code></p> <pre><code>['', '/Users/sam/.virtualenvs/projectx-dev-2/bin', '/Users/sam/.virtualenvs/projectx-dev-2/src/pyrax', '/Users/sam/.virtualenvs/projectx-dev-2/lib/python27.zip', '/Users/sam/.virtualenvs/projectx-dev-2/lib/python2.7', '/Users/sam/.virtualenvs/projectx-dev-2/lib/python2.7/plat-darwin', '/Users/sam/.virtualenvs/projectx-dev-2/lib/python2.7/plat-mac', '/Users/sam/.virtualenvs/projectx-dev-2/lib/python2.7/plat-mac/lib-scriptpackages', '/Users/sam/.virtualenvs/projectx-dev-2/lib/python2.7/lib-tk', '/Users/sam/.virtualenvs/projectx-dev-2/lib/python2.7/lib-old', '/Users/sam/.virtualenvs/projectx-dev-2/lib/python2.7/lib-dynload', '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7', '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin', '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk', '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac', '/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages', '/Users/sam/.virtualenvs/myvirtualenv/lib/python2.7/site-packages', '/Users/sam/.virtualenvs/myvirtualenv/lib/python2.7/site-packages/IPython/extensions'] </code></pre>
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    1. COThis _might_ be a better question for a site like Super User, because I think ultimately the problem has nothing to do with virtualenv, or anything else but bash. But I'm not sure—there's no way of knowing that (either for the OP, or for a future searcher with a similar problem) until you actually know the answer.
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