Cannot install python-pip with yum

You have to enable the EPEL repo, use:

yum --enablerepo=extras install epel-release

This command will install the correct EPEL repository for the CentOS version you are running.

After this you will be able to install python-pip.

I was going crazy about the same issue. The reason why yum couldn't find python-pip was that it is not called python-pip anymore. Starting with EPEL Version 7 it is renamed to identify the python version. On my centOS machine i can find now the following python*-pip packages.

[root@asdasdasdasdsa ~]# yum info python*-pip
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: ftp.rz.uni-frankfurt.de
 * epel: mirrors.mit.edu
 * extras: mirror.23media.de
 * updates: ftp.plusline.de
Available Packages
Name        : python2-pip
Arch        : noarch
Version     : 8.1.2
Release     : 5.el7
Size        : 1.7 M
Repo        : epel/x86_64
Summary     : A tool for installing and managing Python 2 packages
URL         : http://www.pip-installer.org
License     : MIT
Description : Pip is a replacement for `easy_install
            : <http://peak.telecommunity.com/DevCenter/EasyInstall>`_.  It uses mostly the
            : same techniques for finding packages, so packages that were made
            : easy_installable should be pip-installable as well.

Name        : python34-pip
Arch        : noarch
Version     : 8.1.2
Release     : 5.el7
Size        : 1.7 M
Repo        : epel/x86_64
Summary     : A tool for installing and managing Python3 packages
URL         : http://www.pip-installer.org
License     : MIT
Description : Pip is a replacement for `easy_install
            : <http://peak.telecommunity.com/DevCenter/EasyInstall>`_.  It uses mostly the
            : same techniques for finding packages, so packages that were made
            : easy_installable should be pip-installable as well.

The CentOS Docker image doesn't include the EPEL repository by default, as a regular CentOS installation does. You should yum install epel-release first -- after that, yum install python-pip should work.