How to install pip in CentOS 7?

Question

CentOS 7 EPEL now includes Python 3.4: yum install python34

However, when I try that, even though Python 3.4 installs successfully, it doesn't appear to install pip. Which is weird, because pip should be included by default with Python 3.4. which pip3 doesn't find anything, nor does which pip.

How do I access pip from the Python 3.4 package in CentOS 7 EPEL release?

Answer 1

The easiest way I've found to install pip3 (for python3.x packages) on CentOS 7 is:

$ sudo yum install python34-setuptools
$ sudo easy_install-3.4 pip

You'll need to have the EPEL repository enabled before hand, of course.

You should now be able to run commands like the following to install packages for python3.x:

$ pip3 install foo

Answer 2

The CentOS 7 yum package for python34 does include the ensurepip module, but for some reason is missing the setuptools and pip files that should be a part of that module. To fix, download the latest wheels from PyPI into the module's _bundled directory (/lib64/python3.4/ensurepip/_bundled/):

setuptools-18.4-py2.py3-none-any.whl
pip-7.1.2-py2.py3-none-any.whl

then edit __init__.py to match the downloaded versions:

_SETUPTOOLS_VERSION = "18.4"
_PIP_VERSION = "7.1.2"

after which python3.4 -m ensurepip works as intended. Ensurepip is invoked automatically every time you create a virtual environment, for example:

pyvenv-3.4 py3
source py3/bin/activate

Hopefully RH will fix the broken Python3.4 yum package so that manual patching isn't needed.

Answer 3

Update: The python34 bug mentioned below has finally been fixed. It is a perfectly fine choice now.

Rather than using broken EPEL python34 packages, you can enable the IUS repo and have it work properly.

• pip inside virtual environments

The main python34u and python35u IUS packages include the pyvenv tool (/usr/bin/pyvenv-3.4 or /usr/bin/pyvenv-3.5) that includes bundled wheels of pip and setuptools for bootstrapping virtual environments.

• global pip

The python34u-pip and python35u-pip IUS packages include /usr/bin/pip3.4 and /usr/bin/pip3.5 respectively. These work just fine to install packages to the system site-packages directory.