Centos7安裝Python3
1.安裝依賴
yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make
不能忽略相關包，我之前就沒有安裝readline-devel導致執行python模式無法使用鍵盤的上下左右鍵；
2.下載編譯安裝python3
wget https://www.python.org/ftp/python/3.6.5/Python-3.6.5.tgz
tar -zxvf Python-3.6.5.tgz
cd Python-3.6.5
./configure prefix=/usr/local/python3 && make && make install
ln -s /usr/local/python3/bin/python3 /usr/bin/python3
ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3