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This question is as much a question about my particular problem (which I sort of found a work-around, so it's not a burning issue) as it is about the general process I am using.
I have Python 2.7.9 installed locally on my Ubuntu 14.04, and I have a virtualenv in which I am running it. Everything is very much separated from the "system" Python, which I am not touching.
It all started well enough, with my Python installed and all libraries running. For example, I also pip installed numpy 1.10.1, it compiled for a while, then it worked just fine.
The problem is that for reasons beyond my control, I had to rebuild the python with ucs4 enabled, that is I installed it using
./configure --enable-unicode=ucs4
After doing this, I also uninstalled all libraries and reinstalled them using pip. However, it seems that the numpy library was not properly uninstalled because it installed instantly this time, and when I tried to import numpy into my new Python, I got an error message indicating that the numpy was compiled with the ucs2-enabled Python.
This hypothesis is pretty solid, since I tried then to pip install numpy==1.9.3. The installation once again took a long time, and it produced a numpy version that works on the new ucs4 enabled Python.
How can I get the numpy uninstallation process to delete all traces of the old numpy?
Edit:
I also tried to manually remove numpy by deleting it from my virtualenv site-packages directory. After deleting, import numpy returned an ImportError as expected. I then reinstalled it (pip install numpy) and it came back with the same ucs2-related error.
Edit 2:
The full sys.path seen by my virtualenv Python is
['',
'/home/jkralj/.virtualenvs/work/lib/python27.zip',
'/home/jkralj/.virtualenvs/work/lib/python2.7',
'/home/jkralj/.virtualenvs/work/lib/python2.7/plat-linux2',
'/home/jkralj/.virtualenvs/work/lib/python2.7/lib-tk',
'/home/jkralj/.virtualenvs/work/lib/python2.7/lib-old',
'/home/jkralj/.virtualenvs/work/lib/python2.7/lib-dynload',
'/usr/local/lib/python2.7.9/lib/python2.7',
'/usr/local/lib/python2.7.9/lib/python2.7/plat-linux2',
'/usr/local/lib/python2.7.9/lib/python2.7/lib-tk',
'/home/jkralj/.virtualenvs/work/lib/python2.7/site-packages']
Also, it might be important to mention that the /usr/local/lib/python2.7.9/ installation of python does not have numpy installed.
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If you want to force pip to clear out its download cache and use the specific version you can do by using --no-cache-dir command. If you are using an older version of pip than upgrade it with pip install -U pip. This will help you clear pip cache.
With maven or gradle you can install two versions of the same package, with pip you cant. Still you cant use two versions of the same package in the same program.
If you use an older version of pip and have no access to the pip cache command, you can clear the pip cache by manually removing the cache directory.
You can use --no-binary and --ignore-installed to rebuild a package as follows
pip install --user --force-reinstall --ignore-installed --no-binary :all: PackageName
The problem is solved by pip uninstalling numpy (or any other troublesome package), then running
pip install numpy --no-cache-dir
to prevent pip from simply taking the cached installation and repeating it.
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