venv是什么，vevnt

vitualenv

Mac os X或者linux安装:

sudo easy_install virtualenvsudo pip install virtualenv

Ubuntu

sudo apt-get install python-virtualenv

Windows

pip install virtualenv

激活虚拟环境

OS X或者Linux

virtualenv venv. venv/认真的哑铃/activate

Widows

virtualenv venv #在指定目录下创建虚拟环境venv\scripts\activate #激活虚拟环境 C:\Users\H\test>virtualenv venvUsing base prefix 'c:\\program files\\python36'New python executable in C:\Users\H\test\venv\Scripts\python.exeInstalling setuptools, pip, wheel...done.C:\Users\H\test>venv\scripts\activate(venv) C:\Users\H\test>

虚拟环境中安装包

pip install pac_name

安装最新版本的Flask两种方法:

1.git check

$ git clone http://github.com/mitsuhiko/flask.gitInitialized empty Git repository in ~/dev/flask/.git/$ cd flask$ virtualenv venv --distributeNew python executable in venv/认真的哑铃/pythonInstalling distribute............done.$ . venv/认真的哑铃/activate$ python setup.py develop...Finished processing dependencies for Flask

2.使用pip直接下载最新版本的包