The CentOS upgrade system comes with python2.6 for python2.7

Transferred from: https://www.cnblogs.com/terryguan/p/7233801.html

View the Python version in the current system

Python--version

Returns Python 2.6.6 as normal.

Check the CentOS version

Cat/etc/redhat-release

Return to CentOS release 6.9 (Final) as normal.

Install all the development kits

Yum groupinstall-y "Development tools"

Install additional required Packages

Yum install-y zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel

Download, compile, and install Python 2.7.13

wget Https://www.python.org/ftp/python/2.7.13/Python-2.7.13.tgztar zxf python-2.7.13.tgzcd python-2.7.13./ Configuremake && make Install

The default Python 2.7.13 is installed in the/usr/local/bin directory.

Ll-tr/usr/local/bin/python*/usr/local/bin/python2.7/usr/local/bin/python2.7-config/usr/local/bin/python Python2/usr/local/bin/python2, Python2.7/usr/local/bin/python2-config, python2.7-config/usr/local/bin/ Python-config-Python2-config

The Python that comes with the system is in the/usr/bin directory.

Ll-tr/usr/bin/python*/usr/bin/python2.6-config/usr/bin/python2.6/usr/bin/python/usr/bin/python2-PYTHON/USR /bin/python-config-Python2.6-config

Update system default Python version

Rename the Legacy Python version of the system by default.

Mv/usr/bin/python/usr/bin/python.old

Then delete the system default Python-config soft link.

Rm-f/usr/bin/python-config

Finally, create a new version of the Python soft link.

Ln-s/usr/local/bin/python/usr/bin/pythonln-s/usr/local/bin/python-config/usr/bin/python-configln-s/usr/local/ include/python2.7//usr/include/python2.7

After the above steps are done, the Python under directory/usr/bin should be

Ll-tr/usr/bin/python*/usr/bin/python2.6-config/usr/bin/python2.6/usr/bin/python.old/usr/bin/python2-Python /usr/bin/python,/usr/local/bin/python/usr/bin/python-config,/usr/local/bin/python-config

View the new Python version

Python--version

Returns Python 2.7.13 as normal.

The following steps are still necessary

Install Setuptools for new Python

wget Https://bootstrap.pypa.io/ez_setup.py-O-| Python

Once the setuptools is properly installed, the Easy_install command will be installed in the/usr/local/bin directory.

Install PIP for new Python

Easy_install pip

The PIP command will be installed in the/usr/local/bin directory after the correct installation is complete.

Install distribute package for new Python (optional)

Pip Install Distribute

At this point, the new Python is ready to install.

Note: This may cause a previously installed Python program to run or not be restarted (such as the famous Shadowsocks python version). The reason is that the older version of Pkg_resources is located under/usr/lib/python2.6/site-packages. And the new version is under the/usr/local/lib/python2.7/site-packages.
So maybe you need to reinstall the program.

Note again: upgrading Python may result in the Yum command being unavailable. Here's how to fix it:
Edit the/usr/bin/yum file, starting with the first line of

#!/usr/bin/python

Switch

#!/usr/bin/python2.6

However, this change, in case you yum update a bit, Yum has been upgraded, and then back to the same old.
So, after my unremitting pondering and efforts, found a way (online solutions are copied to copy, not a little eggs).
Remember that the important path to the old version of Python 2.6.6 is as follows, when running the Yum command, you will be prompted which module does not exist, we will go to the old version of the path to find, we will be able to find. Once found, copy to the new version of Python under the path/usr/local/lib/python2.7/site-packages/.

/usr/lib/python2.6/site-packages//usr/lib64/python2.6/site-packages/

My copy process is this:

Cp-r/usr/lib/python2.6/site-packages/yum/usr/local/lib/python2.7/site-packages/cp-r/usr/lib/python2.6/ Site-packages/rpmutils/usr/local/lib/python2.7/site-packages/cp-r/USR/LIB/PYTHON2.6/SITE-PACKAGES/INIPARSE/USR /local/lib/python2.7/site-packages/cp-r/usr/lib/python2.6/site-packages/urlgrabber/usr/local/lib/python2.7/ Site-packages/cp-r/usr/lib64/python2.6/site-packages/rpm/usr/local/lib/python2.7/site-packages/cp-r/usr/lib64/ Python2.6/site-packages/curl/usr/local/lib/python2.7/site-packages/cp-p/usr/lib64/python2.6/site-packages/ Pycurl.so/usr/local/lib/python2.7/site-packages/cp-p/usr/lib64/python2.6/site-packages/_sqlitecache.so/usr/ Local/lib/python2.7/site-packages/cp-p/usr/lib64/python2.6/site-packages/sqlitecachec.py/usr/local/lib/ Python2.7/site-packages/cp-p/usr/lib64/python2.6/site-packages/sqlitecachec.pyc/usr/local/lib/python2.7/ Site-packages/cp-p/usr/lib64/python2.6/site-packages/sqlitecachec.pyo/usr/local/lib/python2.7/site-packages/

The CentOS upgrade system comes with a python2.6 of python2.7