mkvirtualenv ImportError: No module named stevedore

Question

I've got a Mac which has python installed and virtualenvwrapper installed. I'm trying to create a new environment by running:

mkvirtualenv Test

To which I get the following error:

New python executable in /Users/sidharthnayyar/.virtualenvs/Test/bin/python
Installing setuptools, pip, wheel...done.
Traceback (most recent call last):
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 174, in _run_module_as_main
        "__main__", fname, loader, pkg_name)
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 72, in _run_code
        exec code in run_globals
    File "/Library/Python/2.7/site-packages/virtualenvwrapper/hook_loader.py", line 16, in <module>
        from stevedore import ExtensionManager
ImportError: No module named stevedore

I have python installed here:

$ which -a python
    /usr/local/bin/python
    /usr/bin/python

If I try sudo pip install stevedore then it says its already installed with some warnings:

sudo /usr/local/bin/pip install stevedore
The directory '/Users/sidharthnayyar/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/Users/sidharthnayyar/Library/Caches/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Requirement already satisfied (use --upgrade to upgrade): stevedore in ./Library/Python/2.7/lib/python/site-packages
Requirement already satisfied (use --upgrade to upgrade): pbr>=1.6 in /Library/Python/2.7/site-packages (from stevedore)
Requirement already satisfied (use --upgrade to upgrade): six>=1.9.0 in ./Library/Python/2.7/lib/python/site-packages (from stevedore)

If I try sudo -H pip install stevedore then I get the following errors:

sudo -H /usr/local/bin/pip install stevedore

Collecting stevedore
    Using cached stevedore-1.18.0-py2.py3-none-any.whl
Requirement already satisfied (use --upgrade to upgrade): pbr>=1.6 in /Library/Python/2.7/site-packages (from stevedore)
Collecting six>=1.9.0 (from stevedore)
    Using cached six-1.10.0-py2.py3-none-any.whl
Installing collected packages: six, stevedore
    Found existing installation: six 1.4.1
        DEPRECATION: Uninstalling a distutils installed project (six) has been deprecated and will be removed in a future version. This is due to the fact that uninstalling a distutils project will only partially uninstall the project.
        Uninstalling six-1.4.1:
Exception:
Traceback (most recent call last):
    File "/Library/Python/2.7/site-packages/pip/basecommand.py", line 215, in main
        status = self.run(options, args)
    File "/Library/Python/2.7/site-packages/pip/commands/install.py", line 317, in run
        prefix=options.prefix_path,
    File "/Library/Python/2.7/site-packages/pip/req/req_set.py", line 736, in install
        requirement.uninstall(auto_confirm=True)
    File "/Library/Python/2.7/site-packages/pip/req/req_install.py", line 742, in uninstall
        paths_to_remove.remove(auto_confirm)
    File "/Library/Python/2.7/site-packages/pip/req/req_uninstall.py", line 115, in remove
        renames(path, new_path)
    File "/Library/Python/2.7/site-packages/pip/utils/__init__.py", line 267, in renames
        shutil.move(old, new)
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 302, in move
        copy2(src, real_dst)
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 131, in copy2
        copystat(src, dst)
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 103, in copystat
        os.chflags(dst, st.st_flags)
OSError: [Errno 1] Operation not permitted: '/tmp/pip-NOex2K-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/six-1.4.1-py2.7.egg-info'

If I create a .bash_profile and put into it:

export WORKON_HOME=$HOME/.virtualenvs
export PROJECT_HOME=$HOME/Devel
export VIRTUALENVWRAPPER_PYTHON=/usr/local/bin/python
export VIRTUALENVWRAPPER_VIRTUALENV=/usr/local/bin/virtualenv
source /usr/local/bin/virtualenvwrapper.sh

and reload a terminal window then I get the following error:

source ~/.bash_profile
Traceback (most recent call last):
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 174, in _run_module_as_main
        "__main__", fname, loader, pkg_name)
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 72, in _run_code
        exec code in run_globals
    File "/Library/Python/2.7/site-packages/virtualenvwrapper/hook_loader.py", line 16, in <module>
        from stevedore import ExtensionManager
ImportError: No module named stevedore
virtualenvwrapper.sh: There was a problem running the initialization hooks. 

If Python could not import the module virtualenvwrapper.hook_loader,
check that virtualenvwrapper has been installed for
VIRTUALENVWRAPPER_PYTHON=/usr/local/bin/python and that PATH is
set properly.

Curious and curiouser.

Any suggestions on what's going wrong and how to fix this?

Thanks Sidharth

Answer 1

I was very confused with this problem, too. And I have solved it by uninstalling the old stevedore and reinstall it.

sudo pip uninstall stevedore
sudo pip install stevedore

Answer 2

Looks like you managed to install virtualwrapper without stevedore, which is a dependency. Try installing it.

pip install stevedore