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創(chuàng)建虛擬環(huán)境
在當(dāng)前目錄創(chuàng)建虛擬環(huán)境:

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$ python -m venv .1
下面是”venv”的詳細(xì)使用參數(shù):
usage: venv [-h] [--system-site-packages] [--symlinks] [--clear] [--upgrade] [--without-pip] ENV_DIR [ENV_DIR ...] Creates virtual Python environments in one or more target directories. positional arguments: ENV_DIR A directory to create the environment in. optional arguments: -h, --help show this help message and exit --system-site-packages Give access to the global site-packages dir to the virtual environment. --symlinks Try to use symlinks rather than copies, when symlinks are not the default for the platform. --copies Try to use copies rather than symlinks, even when symlinks are the default for the platform. --clear Delete the environment directory if it already exists. If not specified and the directory exists, an error is raised. --upgrade Upgrade the environment directory to use this version of Python, assuming Python has been upgraded in-place. --without-pip Skips installing or upgrading pip in the virtual environment (pip is bootstrapped by default)
激活虛擬環(huán)境
在Posix標(biāo)準(zhǔn)平臺(tái)下:
$ source/bin/activate
在Windows cmd下:
C:>/Scripts/activate.bat
在Windows PowerShell下:
PS C:>/Scripts/Activate.ps1
測(cè)試虛擬環(huán)境
激活虛擬環(huán)境后,在命令行會(huì)提示當(dāng)前虛擬環(huán)境的名稱,就表示激活成功了。
在當(dāng)前虛擬環(huán)境中安裝numpy:
$ pip install numpy
當(dāng)前安裝的numpy包與系統(tǒng)中的不會(huì)沖突,下面進(jìn)行測(cè)試:
$ python >>> import numpy >>> print(numpy)
如果輸出了numpy的包路徑就表示一切正常。
官方文檔參考
https://docs.python.org/3/library/venv.html
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本文題目:創(chuàng)新互聯(lián)Python教程:python如何建立venv虛擬環(huán)境
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