Linux  python2  3  共存

whereis python
ll python*

下載python3的包之前，要先安裝相關的依賴包，用于下載編譯python3：
yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make

默認的centos7是沒有安裝pip，先添加epel擴展源
yum -y install epel-release

安裝pip
yum install python-pip

用pip裝wget
pip install wget


用wget下載python3的源碼包，或者自己先下載好，上傳到服務器再安裝，如果網絡快可以直接安裝

wget https://www.python.org/ftp/python/3.6.8/Python-3.6.8.tar.xz

編譯python3源碼包，解壓

xz -d Python-3.6.8.tar.xz tar -xf Python-3.6.8.tar

cd Python-3.6.8

./configure prefix=/usr/local/python3

make && make install


安裝依賴zlib、zlib-deve

yum install zlib zlib

yum install zlib zlib-devel


添加軟鏈接，將原來的鏈接備份

mv /usr/bin/python /usr/bin/python.bak

cd /usr/local/bin/
python3 -> python3.6 

默認2.7   python3  3.6

借鑒https://blog.csdn.net/qq_43592674/article/details/116330033