Python中应用虚拟环境

---------------------------------------------------------Ubuntu----------------------------------------------------------

1.安装pip
sudo apt-get install python3-dev
sudo apt install python3-pip

2.安装virtualenv工具
sudo apt-get install python-virtualenv

3.在工程目录下使用virtualenv工具创建虚拟环境，此时文件夹中将会出现一个venv文件夹
virtualenv -p /usr/bin/python3 py3env

4.激活虚拟环境
. py3env/bin/activate

---------------------------------------------------------CentOS----------------------------------------------------------

1.编译安装

yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel tk-devel readline-devel xz-devel

yum install gcc-c++ gcc -y

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

tar -xzvf Python-3.6.8.tgz

cd Python-3.6.8

./configure --prefix=/usr/local  --enable-shared --enable-profiling

make -j 4

make install

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

2.安装virtualenv工具

pip3 install virtualenv