python 安装虚拟环境
pip install virtualenv
pip install virtualenvwrapper ---Linux
pip install virtualenvwrapper-win ---windows
mkvirtualenv flask_py3
pip freeze > requirements.txt
pip install –r requirements.txt
pip install virtualenv
pip install virtualenvwrapper ---Linux
pip install virtualenvwrapper-win ---windows
mkvirtualenv flask_py3
pip freeze > requirements.txt
pip install –r requirements.txt