1. 過程

# 1. root權限, 安裝依賴
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 gcc-c++

# 2. 從  https://www.python.org/ftp/python/  下載對應版本
wget https://www.python.org/ftp/python/3.6.4/Python-3.6.4.tgz

# 3. 創建 Python 3 目錄
 

mkdir /usr/local/python3 

# 4. 解壓下載文件並切換目錄
tar -zxvf Python-3.6.4.tgz
cd Python-3.6.4/

# 5. 執行
./configure --prefix=/usr/local/python3
make && make install

# 6. 創建Python3的軟鏈接, 創建Pip3的軟鏈接
ln -s /usr/local/python3/bin/python3 /usr/bin/python3
ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3

參考：https://blog.csdn.net/x_koozal/article/details/72432906

centos7 install python3