windows下的virtualenv使用

virtualenv的优点
1.使不同的应用开发环境独立
2.环境升级不影响其他应用，也不影响全局的python环境
3.它可以防止系统中出现包管理混乱和版本的冲突

#安装virtualenvC:\Users\Administrator>pip install virtualenvRequirement already satisfied: virtualenv in d:\python\lib\site-packages#cd到一个目录中C:\Users\Administrator>cd C:\Users\Administrator\Desktop#在这个目录中建立文件夹testdirC:\Users\Administrator\Desktop>virtualenv testdirUsing base prefix 'd:\\python'New python executable in C:\Users\Administrator\Desktop\testdir\Scripts\python.exeInstalling setuptools, pip, wheel...done.#cd到testdir/Scripts文件夹下C:\Users\Administrator\Desktop>cd testdirC:\Users\Administrator\Desktop\testdir>cd Scripts#激活虚拟环境C:\Users\Administrator\Desktop\testdir\Scripts>activate.bat#退出虚拟环境(testdir) C:\Users\Administrator\Desktop\testdir\Scripts>deactivate.bat

#安装virtualwrapper-winC:\Users\Administrator\Desktop\testdir\Scripts>pip install virtualenvwrapper-winCollecting virtualenvwrapper-win  Downloading virtualenvwrapper-win-1.2.2.tar.gzCollecting virtualenv (from virtualenvwrapper-win)  Using cached virtualenv-15.1.0-py2.py3-none-any.whlBuilding wheels for collected packages: virtualenvwrapper-win  Running setup.py bdist_wheel for virtualenvwrapper-win ... done  Stored in directory: C:\Users\Administrator\AppData\Local\pip\Cache\wheels\37\ef\32\563bbf605a7a60268d6585a942660e77ab6abf40d43c1abf3aSuccessfully built virtualenvwrapper-winInstalling collected packages: virtualenv, virtualenvwrapper-winSuccessfully installed virtualenv-15.1.0 virtualenvwrapper-win-1.2.2#建立虚拟环境文件夹，可以先cd目标文件夹下面在建，安装完成后即为激活状态C:\Users\Administrator\Desktop\testdir\Scripts>mkvirtualenv testdir2 C:\Users\Administrator\Envs is not a directory, creatingUsing base prefix 'd:\\python'New python executable in C:\Users\Administrator\Envs\testdir2\Scripts\python.exeInstalling setuptools, pip, wheel...done.#退出虚拟环境(testdir2) C:\Users\Administrator\Desktop\testdir\Scripts>deactivate#workon查看系统下的所有虚拟环境C:\Users\Administrator\Desktop\testdir\Scripts>workonPass a name to activate one of the following virtualenvs:==============================================================================testdir2#workon到某个虚拟环境C:\Users\Administrator\Desktop\testdir\Scripts>workon testdir2#退出虚拟环境(testdir2) C:\Users\Administrator\Desktop\testdir\Scripts>deactivate

#workon选择的虚拟环境文件夹C:\Users\Administrator\Desktop\testdir\Scripts>workon testdir2(testdir2) C:\Users\Administrator\Desktop\testdir\Scripts>pip install requestsCollecting requests  Downloading requests-2.18.4-py2.py3-none-any.whl (88kB)    46% |██████████████▊                 | 40kB 292kB/s eta 0:00:    57% |██████████████████▌             | 51kB 308kB/s eta 0    69% |██████████████████████▏         | 61kB 367kB/s e    80% |█████████████████████████▉      | 71kB 389kB/    92% |█████████████████████████████▌  | 81kB 43    100% |████████████████████████████████| 92kB 451kB/sInstalling collected packages: chardet, idna, certifi, urllib3, requestsSuccessfully installed certifi-2017.7.27.1 chardet-3.0.4 idna-2.6 requests-2.18.4 urllib3-1.22#查看安装的包(testdir2) C:\Users\Administrator\Desktop\testdir\Scripts>pip listDEPRECATION: The default format will switch to columns in the future. You can use --format=(legacy|columns) (or define a format=(legacy|columns) in your pip.conf under the [list] section) to disable this warning.certifi (2017.7.27.1)chardet (3.0.4)idna (2.6)pip (9.0.1)requests (2.18.4)setuptools (36.5.0)urllib3 (1.22)virtualenv (15.1.0)virtualenvwrapper-win (1.2.2)wheel (0.30.0)#卸载requests包(testdir2) C:\Users\Administrator\Desktop\testdir\Scripts>pip uninstall requestsUninstalling requests-2.18.4:Proceed (y/n)? y  Successfully uninstalled requests-2.18.4