###  centos 7 下升級python2到3

###  centos 7下python自帶版本為2.7，但是今天需要用到3，所以升級了一下

###  首先安裝依賴包
~~~
yum -y groupinstall "Development tools"
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
~~~
###  然後根據需求選擇自己需要的python3版本
~~~
wget https://www.python.org/ftp/python/3.6.2/Python-3.6.2.tar.xz
~~~
####  小提示:如果你的伺服器顯示找不到wget這個命令的話用yum安裝一下就好。一般最小化安裝會出現這個問題
~~~
yum install -y wget
~~~

###  建立一個空資料夾

###  然後解壓壓縮包，進入該目錄，安裝Python3
~~~
mkdir /usr/local/python3
tar -xvJf  Python-3.6.2.tar.xz
cd Python-3.6.2
./configure --prefix=/usr/local/python3
make && make install
~~~

###  然後建立一下軟連結就好了

    [[email protected] Python-3.6.2]# ln -s /usr/local/python3/bin/python3 /usr/bin/python3
    [

[email protected] Python-3.6.2]# ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3
    [[email protected] Python-3.6.2]# python3
    Python 3.6.2 (default, Aug  3 2018, 15:15:12)
    [GCC 4.8.5 20150623 (Red Hat 4.8.5-28)] on linux
    Type "help", "copyright", "credits" or "license" for more information.
    >>>

###  -over-