1.查看centos中自帶的Python地址：which python（一般在 /usr/bin/python）
2.切換到python安裝目錄：cd? /usr/bin
3.查看對應的Python版本指向：ls -l python*
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4.創建一個空目錄：mkdir? /usr/local/python3
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5.升級安裝對應的依賴：
#yum -y groupinstall "Development tools" #yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel
#yum -y install db4-devel libpcap-devel xz-devel
#yum install libffi-devel -y
#yum install epel-release -y
#yum install gcc -y
6.下載Python3：
#wget https://www.python.org/ftp/python/3.7.2/Python-3.7.2.tar.xz
7.解壓Python-3.7.2.tar.xz
#tar -xvJf Python-3.7.2.tar.xz
8.配置./configure --prefix優化：
切換到Python-3.7.2中
#cd Python-3.7.2
#./configure --prefix=/usr/local/pthon3
8.安裝Python：
#make && make install > install.log (安裝日志看個人需求)
9.軟連接創建：
#cd Python3.7.2中 （在該路徑下進行配置）
#ln -s /usr/local/python3/bin/python3 /usr/bin/python3 #ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3
10.驗證安裝成功：
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