python2.7.X 升級至Python3.6.X

python2.7.X 升級至Python36.X

安裝Python3

項目是在py3環境下進行編碼的，正好Centos默認的py版本是2，我們還需要安裝py3才能讓程序run起來，在此之前，需要安裝開發工具包，因為要編譯安裝Python
 [root@CentOS ~]# yum -y group install "Development Tools" 

安裝Python的依賴包，不安裝依賴可能安裝完成后沒有pip3 軟件。

[root@CentOS ~]# yum -y install openssl-devel bzip2-devel expat-devel gdbm-devel readline-devel sqlite-devel vim 

下載目前最新的Python3.5.x
 [root@CentOS ~]# wget https://www.python.org/ftp/python/3.5.3/Python-3.5.3.tgz 
可能你需要通過yum -y install wget

解壓編譯安裝

[root@CentOS ~]# tar xf Python-3.5.3.tgz 
[root@CentOS ~]# cd Python-3.5.3
[root@CentOS Python-3.5.3]# ./configure --prefix=/usr/local/python3.5
[root@CentOS Python-3.5.3]# make
[root@CentOS Python-3.5.3]# make altinstall

為pip3和python3創建鏈接

[root@CentOS Python-3.5.3]# ln -fs /usr/local/python3.5/bin/python3 /usr/local/bin/
[root@CentOS Python-3.5.3]# ln -fs /usr/local/python3.5/bin/pip3 /usr/local/bin/
[root@CentOS Python-3.5.3]# mv /usr/bin/python/usr/bin/python_old
[root@CentOS Python-3.5.3]# ln -fs /usr/local/python3.5/bin/python3.5 /usr/bin/python
[root@CentOS Python-3.5.3]# ln -fs /usr/local/python3.5/bin/pip3.5 /usr/bin/pip

驗證安裝

[root@CentOS Python-3.5.3]# pip -V
pip 9.0.1 from /usr/local/python3.5/lib/python3.5/site-packages (python 3.5)
[root@CentOS Python-3.5.3]# python -V
Python 3.5.3

修改yum文件，否則yum將無法下載

vim /usr/bin/yum

 

將

#!/usr/bin/python

 

修改為

#!/usr/bin/python2.7

 

保存即可生效