Creating a virtual Environment in Python (virtualenv module)

For Environment: win7,python2.7

requires virtualenv module
1. Test whether the Virtualenv module is installed
    import virtualenv   #没有报错则已安装
    You will need to install the Virtualenv module
    pip install virtualenv
2. First create a directory (f://learning_log)
    switch to the corresponding directory after use: virtualenv ll_env  #ll_env虚拟环境名 (optional)    
3. Activate
    ll_env\scripts\activate
    display (ll_env) F:\learning_log> The activation is successful
    Note: Windows users may get an error when activating, as the Activate.bat will be in the same        ACTIVATE.PS1 is generated in the       directory, and PowerShell is not allowed to execute *.ps1       by default       script files. So first you need to turn on permissions. Open permissions only need to be in PowerShell             execute Set-executionpolicy RemoteSigned. Enter Y last, and enter!
        Then, enter the activation instructions again in the corresponding directory to activate.
4. Exit the virtual Environment
    (ll_env) f:\learning_log>ll_env\scripts

Create a virtual Environment (virtualenv module) in Python