If you are using 6 you can use this tutorial to both Python 2.7.x and Python 3.6.x. For CentOS 7 only the Python 3.6.x instructions below are applicable. Warning! Do not Python 2.7.13 on CentOS 7 using these instructions. Your system will end up having two different python2.7 binaries, each with its own package directory. This will likely cause difficult-to-diagnose problems.

 install -y centos-release-SCL
 install -y python27
$ which python 

$ python -V
Python 2.7.3

$ ls -ltr /usr/local/bin/pyth*
lrwxrwxrwx 1  root      24 Jan 30  2013 /usr/local/bin/python -> /usr/local/bin/python2.7
-rwxr-xr-x 1  root 6162289 Sep  3 00:59 /usr/local/bin/python2.7
-rwxr-xr-x 1  root    1624 Sep  3 01:00 /usr/local/bin/python2.7-config

So yum will use ‘/usr/bin/python’ which is 2.6

$ /usr/bin/python -V
Python 2.6.6

“python” will give you python 2.7.

“python2.7” will give you python 2.7.

“easy_install” and “easy_install-2.7” will easy install for python 2.7. While separate files, they both seem to install into /usr/local/lib/python2.7/site-packages/

$ ls -ltr /usr/local/bin | grep easy_
-rwxr-xr-x   1 root root     340 Jan 30  2013 easy_install-2.7
-rwxr-xr-x   1 root root     332 Jan 30  2013 easy_install

note the dash before the 2.7

The easy_install’s in /usr/bin are for 2.6

$ ls -ltr /usr/bin/easy*
-rwxr-xr-x. 1 root root 331 Nov 11  2010 /usr/bin/easy_install-2.6
-rwxr-xr-x. 1 root root 323 Nov 11  2010 /usr/bin/easy_install

###I would recommend python 2.7 on all local machines I suspect everyone is already ok?. To check:

[[email protected] etc]# python -V
Python 2.7.3

Instructions for python 2.7 install on 7, , mac will be on another page.

Because of centos 6.3 on the cluster machines, we need both 2.6 and 2.7 to coexist there. hopefully only there.

Centos relies on python 2.6 for yum

if you install python 2.7 in any way other than the following you will destroy the system and make yum inoperable

zlib failure message may be from internal python doing uncompression and they may be referring to python module files, rather than looking at links directly. Not sure.

I believe only the x86_64 zlib is needed. i.e. you don’t need 32-bit and 64-bit, but just follow these instructions. They worked on apu.0xdata.loc ( on 9/28/2012

to check centos version

[[email protected] etc]# cat /etc/-release
CentOS release 6.9 (Final)

CentOS 6.9 ships with Python 2.6.6 and depends on that specific version. Be careful not to replace it or bad things will happen. If you need access to a newer version of Python you must compile it yourself and install it side-by-side with the system version.

Here are the steps necessary to install Python 2.7.6. Execute all the commands below as root. Either log in as root temporarily or use sudo.

###Install development tools

In order to compile Python you must first install the development tools:

yum groupinstall "Development tools"

You also need a few extra libs installed before compiling Python or else you will run into problems later when trying to install various packages:

yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel

###Download, compile and install Python

The –no-check-certificate is optional

cd /opt
wget --no-check-certificate https://www.python.org/ftp/python/2.7.13/Python-2.7.13.tar.xz
 xf Python-2.7.13..xz
cd Python-2.7.13
./configure --prefix=/usr/local
make && make altinstall

It is important to use altinstall instead of install, otherwise you will end up with two different versions of Python in the filesystem both named python.

(Depending on your version of wget, you may need to add the –no-check-certificate option to the wget command line.)

After running the commands above your newly installed Python 2.7.6 interpreter will be available as /usr/local/bin/python2.7 and the system version of Python 2.6.6 will be available as /usr/bin/python and /usr/bin/python2.6.

Check with:

[email protected]:/opt/Python-2.7.6 ] ls -ltr /usr/bin/python*

lrwxrwxrwx 1 root root    6 Nov 16  2002 /usr/bin/python2 -> python
-rwxr-xr-x 1 root root 1418 Jul 10  2013 /usr/bin/python2.6-config
-rwxr-xr-x 2 root root 4864 Jul 10  2013 /usr/bin/python2.6
-rwxr-xr-x 2 root root 4864 Jul 10  2013 /usr/bin/python
lrwxrwxrwx 1 root root   16 Oct 24 15:39 /usr/bin/python-config -> python2.6-config

[email protected]:/opt/Python-2.7.6 ] ls -ltr /usr/local/bin/python*
-rwxr-xr-x 1 root root 6214533 Mar 19 22:46 /usr/local/bin/python2.7
-rwxr-xr-x 1 root root    1674 Mar 19 22:46 /usr/local/bin/python2.7-config

If things don’t look right, you might need to create a symbolic link in /usr/local/bin

cd /usr/local/bin
ls -ltr python*

WARNING: don’t do this before checking the $PATH for root. if it has /usr/local/bin before /usr/bin, it will see python2.7 first i.e.

[email protected] h2o]# echo $PATH

If you add this link, do a “which python” for the user and for root. If root is pointing to /usr/local/bin/python, remove the link you just added, and figure out something else.

ln -s /usr/local/bin/python2.7 /usr/local/bin/python

final check:

sudo sh
[email protected]:~ ] which python
[email protected]:/home/0xdiag ] python
Python 2.6.6 (r266:84292, Jul 10 2013, 22:48:45) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-3)] on linux2
[email protected]:~ ] exit

sudo - user
[email protected]:~ ] which python
[email protected]:~ ] python
Python 2.7.6 (default, Mar 19 2014, 22:45:29) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.

###Installing and configuring distribute (setuptools)

After installing Python 2.7.6 you also need to install distribute (setuptools) so you can easily install new packages in the right location.

wget --no-check-certificate https://bootstrap.pypa.io/ez_setup.py
sudo /usr/local/bin/python2.7 ez_setup.py
sudo /usr/local/bin/easy_install-2.7 pip

The commands above will generate the script /usr/local/bin/easy_install-2.7. Use this script to install packages for your new Python version. You should be able to use “easy_install” if “which easy_install” points to the correct 2.7 versions

I’m jumping between two different machine installs here, sorry about that, pay attention to /usr/local/bin vs /usr/bin

[email protected]$ which pip

$ which easy_install

$ ls -ltr /usr/local/bin/easy_install*
-rwxr-xr-x 1 root root 340 Jan 30  2013 /usr/local/bin/easy_install-2.7
-rwxr-xr-x 1 root root 332 Jan 30  2013 /usr/local/bin/easy_install

sudo /usr/local/bin/easy_install-2.7 requests
sudo /usr/local/bin/easy_install-2.7 psutil
sudo /usr/local/bin/easy_install-2.7 paramiko

(for normal user, easy_install should work too, if your PATH gets /usr/local/bin first)

I had to rename pip and easy_install in /user/local/bin and create links. The existing ones were 2.6 variants. Check first though if pip and easy_install act right after install. On this system they did:

[[email protected] kevin]# cd /usr/local/bin
[[email protected] bin]# ls -ltr pip*
-rwxr-xr-x 1 root root 213 Oct 20 22:55 pip2.7
-rwxr-xr-x 1 root root 213 Oct 20 22:55 pip2
-rwxr-xr-x 1 root root 296 Oct 20 22:58 pip3.4
-rwxr-xr-x 1 root root 290 Oct 20 22:58 pip
-rwxr-xr-x 1 root root 292 Oct 20 22:58 pip3

I think if root uses pip or easy_install it will install into python 2.7, not 2.6 maybe that doesn’t matter

On this system, it’s because /usr/local/bin comes before /usr/bin

[[email protected] bin]# which pip
[[email protected] bin]# which easy_install

[[email protected] bin]# pip --version
pip 1.5.6 from /usr/local/lib/python2.7/site-packages (python 2.7)
[[email protected] bin]# easy_install --version
setuptools 7.0
[[email protected] bin]# pip2.7 --version
pip 1.5.6 from /usr/local/lib/python2.7/site-packages (python 2.7)
[[email protected] bin]# 

Fixing the $PATH would make that correct, since the 2.6 gets resolved correctly with /usr/bin

[[email protected] bin]# /usr/bin/pip --version
pip 1.3.1 from /usr/lib/python2.6/site-packages (python 2.6)

[email protected] bin]# /usr/bin/easy_install --version
distribute 0.6.10

In any case, if this doesn’t cause a problem due to $PATH in root or users, you can do this:

cd /usr/local/bin
mv pip pip2.6
mv easy_install easy_install-2.6
ln -s pip2.7 pip
ln -s easy_install-2.7 easy_install

result in /usr/local/bin

-rwxr-xr-x 1 root root 6214533 Mar 19 22:46 python2.7
-rwxr-xr-x 1 root root    1674 Mar 19 22:46 python2.7-config
lrwxrwxrwx 1 root root      24 Mar 19 22:51 python -> /usr/local/bin/python2.7
-rwxr-xr-x 1 root root     323 Mar 19 23:18 easy_install-2.6
-rwxr-xr-x 1 root root     331 Mar 19 23:18 easy_install-2.7
-rwxr-xr-x 1 root root     296 Mar 19 23:22 pip2.7
-rwxr-xr-x 1 root root     290 Mar 19 23:22 pip2.6
-rwxr-xr-x 1 root root     292 Mar 19 23:22 pip2
lrwxrwxrwx 1 root root      16 Mar 19 23:29 easy_install -> easy_install-2.7

result in /usr/bin

 ls -ltr /usr/bin/pip
-rwxr-xr-x 1 root root 281 Oct 24 15:38 /usr/bin/pip

 ls -ltr /usr/bin/easy_install
-rwxr-xr-x 1 root root 323 Nov 11  2010 /usr/bin/easy_install
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