一、venv简介
C:\Users\love1>python -m venv -h
usage: venv [-h] [--system-site-packages] [--symlinks | --copies] [--clear] [--upgrade] [--without-pip]
[--prompt PROMPT] [--upgrade-deps]
ENV_DIR [ENV_DIR ...]
该命令用于在一个目录或者多个目录中创建一个虚拟的python环境。
二、venv模块详解
1、创建一个虚拟环境
C:\Users\love1>python -m venv C:\Users\love1\Documents\technology\python\project\myvenv
2、激活一个虚拟环境
一个虚拟环境在使用之前，需要将其激活，激活方式如下：
| Platform | Shell | Command to activate virtual environment |
|---|---|---|
| POSIX | bash/zsh | $ source /bin/activate |
| POSIX | fish | $ source /bin/activate.fish |
| POSIX | csh/tcsh | $ source /bin/activate.csh |
| POSIX | PowerShell | $ /bin/Activate.ps1 |
| Windows | cmd.exe | C:> \Scripts\activate.bat |
| Windows | PowerShell | PS C:> \Scripts\Activate.ps1 |
激活之后会有如下显示
(myvenv) C:\Users\love1\Documents\technology\python\project\myvenv\Scripts>
3、退出一个虚拟环境
可以使用deactivate命令关闭一个虚拟环境
三、virtualenv简介
1、virtualenv -h
C:\Users\love1>virtualenv
usage: virtualenv [--version] [--with-traceback] [-v | -q] [--read-only-app-data] [--app-data APP_DATA] [--reset-app-data] [--upgrade-embed-wheels] [--discovery {builtin}] [-p py] [--try-first-with py_exe]
[--creator {builtin,cpython3-win,venv}] [--seeder {app-data,pip}] [--no-seed] [--activators comma_sep_list] [--clear] [--no-vcs-ignore] [--system-site-packages] [--copies] [--no-download | --download]
[--extra-search-dir d [d ...]] [--pip version] [--setuptools version] [--wheel version] [--no-pip] [--no-setuptools] [--no-wheel] [--no-periodic-update] [--symlink-app-data] [--prompt prompt] [-h]
dest
virtualenv: error: the following arguments are required: dest
SystemExit: 2
也可以通过以下命令展示
python -m virtualenv -h