Python3虛擬環境--venv

weixin_33896726發表於2018-01-08
Python

Python3.3以上的版本通過venv模組原生支援虛擬環境，可以代替之前的virtualenv。

該venv模組提供了建立輕量級“虛擬環境”，提供與系統Python的隔離支援。每一個虛擬環境都有其自己的Python二進位制（允許有不同的Python版本創作環境），並且可以擁有自己獨立的一套Python包。

注意：python3.3中使用”venv”命令建立的環境不包含”pip”，需進行手動安裝。Python3.4中改進了這一缺陷。

建立虛擬環境

1 python -m venv myvenv

此命令會在當前目錄下生成一個名為myvenv的目錄，myenv也是建立的虛擬環境名。

啟用環境：

/Scripts/activate.bat

退出環境：

/Scripts/deactivate.bat

 

附：

venv使用引數：

 1 usage: venv [-h] [--system-site-packages] [--symlinks] [--clear]
 2             [--upgrade] [--without-pip] ENV_DIR [ENV_DIR ...]
 3 
 4 Creates virtual Python environments in one or more target directories.
 5 
 6 positional arguments:
 7   ENV_DIR             A directory to create the environment in.
 8 
 9 optional arguments:
10   -h, --help             show this help message and exit
11   --system-site-packages Give access to the global site-packages dir to the
12                          virtual environment.
13   --symlinks             Try to use symlinks rather than copies, when symlinks
14                          are not the default for the platform.
15   --copies               Try to use copies rather than symlinks, even when
16                          symlinks are the default for the platform.
17   --clear                Delete the environment directory if it already exists.
18                          If not specified and the directory exists, an error is
19                          raised.
20   --upgrade              Upgrade the environment directory to use this version
21                          of Python, assuming Python has been upgraded in-place.
22   --without-pip          Skips installing or upgrading pip in the virtual
23                          environment (pip is bootstrapped by default)

 

 

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