CentOS?7 默認的python版本是python2.7.5。因為yum依賴于默認的python版本的緣由，所以要先保留默認版本，并修改yum文件頭部后，才能開始安裝更新python2和python3兩個最新版本。(python2和python3共存)

一. 保留默認python版本2.7.5，并修改yum頭部，保持yum對默認版本python2.7.5的依賴

1.su root　　# 獲取root權限

2.mv /usr/bin/python2.7 /usr/bin/python2.7.5　　# 保留默認版本python為python2.7.5

ln -s /usr/bin/python2.7.5 /usr/local/bin/python2.7.5　　# 創建軟連接

3.ll /usr/bin/yum*　　# 查看/usr/bin/目錄下所有yum文件(7個)頭部

4.vi /usr/bin/yum*　　# 修改/usr/bin/目錄下所有yum文件(7個)頭部

#!/usr/bin/python —> #!/usr/bin/python2.7.5

5.vi /usr/libexec/urlgrabber-ext-down　　# 修改/usr/libexec/目錄下 urlgrabber-ext-down頭部

#!/usr/bin/python —> #!/usr/bin/python2.7.5

二. 安裝最新版python2.7.13和python3.6.2(python2和python3共存，修改后默認版本為python3.6.2)

準備工作：

1. 安裝wget命令(可以在線下載安裝包的命令)

yum -y install wget

2. 準備編譯環境

yum groupinstall 'Development Tools'

yum install zlib-devel bzip2-devel openssl-devel ncurses-devel

3. 下載并安裝最新版本的python2和python3的tgz壓縮文件

https://www.python.org/ftp/python/2.7.13/Python-2.7.13.tgz

https://www.python.org/ftp/python/3.6.2/Python-3.6.2.tgz

開始安裝：

1. 進入下載目錄：

cd /usr/local/src

2. 下載并安裝最新版本python2：

wget https://www.python.org/ftp/python/2.7.13/Python-2.7.13.tgz

tar zxvf Python-2.7.13.tgz

cd Python-2.7.13

./configure

make all

make install

make clean

make distclean

rm -rf /usr/bin/python

rm -rf /usr/bin/python2

rm -rf /usr/bin/python2.7

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

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

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

/usr/bin/python -V

/usr/bin/python2 -V

/usr/bin/python2.7 -V

rm -rf /usr/local/bin/python

rm -rf /usr/local/bin/python2

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

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

python -V

python2 -V

python2.7 -V

3. 下載并安裝最新版本python3：

wget https://www.python.org/ftp/python/3.6.2/Python-3.6.2.tgz

tar zxvf Python-3.6.2.tgz

cd Python-3.6.2

./configure

make all

make install

make clean

make distclean

rm -rf /usr/bin/python

rm -rf /usr/bin/python3

rm -rf /usr/bin/python3.6

ln -s /usr/local/bin/python3.6 /usr/bin/python

ln -s /usr/local/bin/python3.6 /usr/bin/python3

ln -s /usr/local/bin/python3.6 /usr/bin/python3.6

/usr/bin/python -V

/usr/bin/python3 -V

/usr/bin/python3.6 -V

rm -rf /usr/local/bin/python

rm -rf /usr/local/bin/python3

ln -s /usr/local/bin/python3.6 /usr/local/bin/python

ln -s /usr/local/bin/python3.6 /usr/local/bin/python3

python -V

python3 -V

python3.6 -V

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總結

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