Saturday. February 24, 2018 - 1 min

Installing Python 3.6 on Linux

Python3.6 Installation
Problem Solving

Python3.6 Installation

Install Packages

yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel

Download and unpack

1. Download specific python 3 version as needed
 wget https://www.python.org/ftp/python/3.6.1/Python-3.6.1.tgz

2.Unpack
 tar -xf Python-3.6.1.tgz

3.进入目录
 cd Python-3.6.1/

Configure

 ./configure --prefix=/usr/local/python3
 make
 make install

Create symbolic link

1.Remove the symbolic link of old version Python
 mv /usr/bin/python /usr/bin/python_bak

2.Symlink /usr/local/python3/bin/python3 to /usr/bin/python
 ln -s /usr/local/python3/bin/python3 /usr/bin/python

Check version

 python -V

Problem Solving

After switching the default Python version of the system to Python 3, There have two problems will occur~ yum and pip3 cannot be used, the solution is as follows

How to fix yum Error

 Error：
 	[root@Topaz tools]# yum -y install xxx
 	File "/usr/bin/yum", line 30
 Fixing：
 	//shangbang point to python 2.7
	[root@Topaz tools]# vim /usr/bin/yum
	#!/usr/bin/python2.7		

	// CentOS7 need to modify /usr/libexec/urlgrabber-ext-down as well
	[root@Topaz tools]# vim /usr/libexec/urlgrabber-ext-down
	#!/usr/bin/python2.7

How to fix pip3 can not be used

Symlink /usr/local/python3/bin/pip3 to /usr/bin

 ln -s /usr/local/python3/bin/pip3 /usr/local/bin/pip3

Topaz

Always keep learning.