Packages installed by pip in lib64 are not recognized by pip

• Pip version: 9.0.1
• Python version: 3.5
• Operating system: Amazon Linux AMI release 2017.03

Description:

I am working in a virtual environment created with virtualenv. There are a few packages that I am trying to install, however two of them, psycopg2 and pillow, are not working correctly.

When I run pip install <package>, it works as expected. However, neither of the two modules are shown using pip show <package> or pip list. pip install <package> can be run again with the same result.

It turns out that the two packages were being installed in env/lib64/python3.5/dist-packages. All the other packages were being installed in env/lib/python3.5/dist-packages

For some reason, pip is not seeing the packages it has installed in the lib64 folder. Packages installed in the lib folder are recognized correctly.

What I’ve run:

(env)[ec2-user@ws4 test]$ pip install psycopg2
Collecting psycopg2
  Using cached psycopg2-2.7.1-cp35-cp35m-manylinux1_x86_64.whl
Installing collected packages: psycopg2
Successfully installed psycopg2-2.7.1

(env)[ec2-user@ws4 test]$ pip show psycopg2
(env)[ec2-user@ws4 test]$

(env)[ec2-user@ws4 test]$ pip install pillow
Collecting pillow
  Using cached Pillow-4.1.1-cp35-cp35m-manylinux1_x86_64.whl
Requirement already satisfied: olefile in /var/www/domains/ndp/associations/env/lib/python3.5/dist-packages (from pillow)
Installing collected packages: pillow
Successfully installed pillow-4.1.1

(env)[ec2-user@ws4 test]$ pip show pillow
(env)[ec2-user@ws4 test]$

[morrone]

Same problem here with pip 9.0.1 and python 3.6. My information for what @xavfernandez asked for is substantially similar to what @jpotterm supplied. I too was able to work around the problem by using “pip install --upgrade --target /path/to/my/sandbox/lib/python3.6/dist-packages”. That seems to force everything into lib that was once isntalled in lib64. Now pip and python can find those packages.

[nchammas]

I am seeing this exact issue as well on Amazon Linux. pip is installing everything to lib/ except for a couple of libraries, which it installs to lib64/. In my case, those libraries are jellyfish and regex. My current workaround is to use pip --target to force pip to install to lib/ rather than lib64/.

So my questions are:

• Why does pip install some libraries to lib/ vs. lib64/?
• Why isn’t pip seeing the stuff it’s installing itself to lib64/?