Summary of problems encountered when installing Python3.6 under CentOS 7

Let's first introduce the method of installing Python3.6 under CentOS 7

Install python3.6 dependencies that may be used

yum install openssl-devel bzip2-devel expat-devel gdbm-devel readline-devel sqlite-devel

The & # 8226; Go to the python website to find the download path and use wget to download

wget https://www.python.org/ftp/python/3.6.4/Python-3.6.4.tgz

The & # 8226; Unpack the tgz package

tar -zxvf Python-3.6.4.tgz

The & # 8226; Move python under /usr/local

mv Python-3.6.4 /usr/local

The & # 8226; Remove old versions of python dependencies

ll /usr/bin | grep python
rm -rf /usr/bin/python

The & # 8226; Go to the ES34en directory

cd /usr/local/Python-3.6.4/

The & # 8226; configuration

./configure

The & # 8226; Compile make

make

The & # 8226; Compile, install

make install

The & # 8226; Delete the old soft link and create a new soft link to the latest python

rm -rf /usr/bin/python
ln -s /usr/local/bin/python3.6 /usr/bin/python
python -V

Unable to use yum after reinstalling python3.6

Question:

[

$ yum
File "/usr/bin/yum", line 30
except KeyboardInterrupt, e:
^

SyntaxError: invalid syntax

]

The reason:

This is because yum uses python as the command interpreter, which can be found in the /usr/bin/yum file on line 1 #! / usr/bin/python found. The compatibility between python versions is not good, which leads to syntax inconsistencies between X versions 2 and 3.0. However, yum which comes with CentOS 5 uses python2.4. When the system upgrades python to 2.6 or 3.0, there are syntax interpretation errors.

Solutions:

Simple: 1 is to upgrade yum and 1 is to change the interpreter of yum to the older version python2.4 (if you did not use the override upgrade).

The yum upgrade will not be detailed. Change the yum interpreter to the old version python2.4:

$ vi /usr/bin/yum

Set line 1 "#! / usr/bin/python "instead of" #! / usr/bin/python2. 4 ".

conclusion