What should I do if Python cannot be used when upgrading Python to CentOS 6.4?

The following is an introduction to the solution to the problem that yum cannot be used due to upgrading Python in CentOS 6.4. After all, reinstalling yum is troublesome and may not be feasible. You can use the method introduced in this article to fix it.

1. Check the current system python version

1python -V

2. Download version 2.7.3 of Python

1wget http://python.org/ftp/python/2.7.3/Python-2.7.3.tar.bz2

3. Unzip and install

tar -jxvf Python-2.7.3.tar.bz2

#Enter the decompressed directory

cd Python-2.7.3

#Compile and install

. /configure

make

Make install

4. Check whether the installation is successful

/usr/local/bin/python2.7 -V

#If the following information appears, it means the installation is successful.

Python 2.7.3

5. Establish soft links

#Under normal circumstances, even after python2.7 is successfully installed, the python pointed to by the system by default is still version 2.6.6. Considering that yum is based on python2.6.6 to work properly, uninstallation is not recommended.

#Use the following method to change the system default python to version 2.7.3

mv /usr/bin/python /usr/bin/python2.6.6

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

#Check whether the test is successful

python -V

#The presence of version 2.7.3 information indicates success

Python 2.7.3

6. Solve the problem of yum being unavailable after modifying the system default python version

#Modify yum file

vi /usr/bin/yum

#! /usr/bin/python

Change it to the following content

#! /usr/bin/python2.6.6

The entire upgrade process is completed.

7. Other questions

Yum is already available, but I don’t know which person has modified what file in the system, resulting in the error message “ no named yum” when using yum. After consulting the information, I learned that they are all versions of python that allow you to modify the head of yum.

But I have already modified it (step 6), and I don’t know how to solve it. Finally, I gave up "Du Niang" and used Google, which is often harmonized, and found a document on the Centos official website. The method is as follows.

First, find the CD or ISO file where you installed Centos, as long as the system version is the same. Copy the following files to the system:

python-2.6.6-36.el6.x86_64.rpm

python-urlgrabber-3.9.1-8.el6.noarch.rpm

python-devel-2.6.6-36.el6.x86_64.rpm

python-libs-2.6.6-36.el6.x86_64.rpm

yum-3.2.29-40.el6.centos.noarch.rpm

The specific version number is based on your system disk or ISO. I copied it to the following directory

/usr/local/src/Python-2.6.6

Execute the installation

cd /usr/local/src/Python-2.6.6/

rpm -Uvh --replacepkgs *.rpm

#The following prompt appears