Python virtual environment command sorting

If installed , Skip this section

1. Install virtual environment tools ： pip install virtualenv

2. Install virtual environment management tools ：pip install virtualenvwrapper

3. Create a folder for the virtual environment ：mkdir virtualenvs

4. modify ./bashrc and source

export WORKON_HOME=~/.virtualenvs
source ~/virtualenvwrapper.sh
VIRTUALENVWRAPPER_PYTHON=/usr/bin/Python3

1. Show existing virtual environments ：workon
2. Enter the virtual environment ：workon env_name
3. Exit the current virtual environment :deactivate
4. Delete the current virtual environment ：rmvirtualenv env_name