Python: Virtual Environment-Ubuntu16.04

1、 System environment###

Ubuntu16.04

2、 Install virtual environment###

• Upgrade pip3

pip3 install --upgrade pip

• Install virtual environment

sudo pip install virtualenv
sudo pip install virtualenvwrapper

virtualenvwrapper is an extended management package of virtualenv, which can integrate all virtual environments in one directory.

3、 Configure virtual environment###

• Create virtual environment management directory

sudo mkdir ~/.envs

• Open .bashrc

sudo vim ~/.bashrc

• Add the following at the end of .bashrc

export WORKON_HOME=$HOME/.envs  #All virtual environment storage directories
source /usr/local/bin/virtualenvwrapper.sh

• Make the configuration effective

source ~/.bashrc

• Update configuration file error: No module named virtualenvwrapper

The solution is to re-add python-related environment variables, first confirm the Python version that virtualenvwrapper depends on

export VIRTUALENVWRAPPER_PYTHON=/usr/bin/python
export VIRTUALENVWRAPPER_VIRTUALENV=/usr/local/bin/virtualenv

4、 Virtual environment operation###

• Create a virtual environment

mkvirtualenv env_name
# env_name is the name of the virtual environment you want to create, which needs to be connected to the Internet

• Create a virtual environment of the specified python version

mkvirtualenv -p /usr/bin/python3.6 python36_
mkvirtualenv -p /usr/bin/python2.7 python27_

• View all virtual environments installed

workon

• Enter the virtual environment

workon env_nam

• Exit the virtual environment

deactivate

• Delete virtual environment

rmvirtualenv env_nam