Python实战：Python虚拟环境（venv）的创建与使用

一、引言开发期间, 项目间的依赖管理属于常见问题, 不同项目需要各异版本或依赖库, 为解决此问题, 可运用虚拟环境venv, 虚拟环境乃是一种隔离环境, 其准许我们为每个项目都创建一个独立环境, 借此避免版本冲突以及依赖问题, 本文会详细介绍虚拟环境的创建与使用方法。二、虚拟环境的基本概念处于隔离状态的环境被称作虚拟环境, 此环境能够让我们针对每个项目去打造一个单独的环境, 虚拟环境具备以下这些特点:单独存在的特性: 每一个虚拟的环境皆是具备独自的解释器以及库的。这就意味着在不一样的虚拟环境当中, 你能够运用不同样式的版本或者依赖库, 然而却不会对其他的环境造成影响。能够进行迁移的性质: 处于虚拟环境里的项目能够较为轻易地迁移至其它的环境当中, 这是因为它们依赖于虚拟环境里的库。具备安全性方面: 虚拟环境能够对系统环境的访问予以限制, 依此来提升项目的安全程度。三、创建虚拟环境打造虚拟环境极为简便, 你能够运用内置的venv模块。紧接着呈现的是创建虚拟环境的具体步骤, 分别为此:import venv # 创建一个新的虚拟环境 venv.create(my_virtual_env)于上述例子里头, 我们构建了一个名为的全新虚拟环境, 你能够把此目录转移至其他地方, 或者是为别的项目打造不一样的虚拟环境。四、激活虚拟环境是不是能激活那虚拟环境得看你用的是哪种操作系统, 于Unix以及Linux系统里, 你能够借助命令, 在和Mac系统当中, 你可采用.\\命令, 下面是关于怎样激活虚拟环境的步骤:# 在Unix和Linux系统中 source my_virtual_env/bin/activate # 在Windows和Mac系统中 .\my_virtual_env\Scripts\activate五、在虚拟环境中安装和管理依赖处于虚拟环境里, 你能够运用pip去开展安装以及管理依赖的操作。以下便是在虚拟环境当中进行安装依赖的相关步骤, 具体是这样的:# 安装一个依赖 pip install some-package # 更新一个依赖 pip install --upgrade some-package # 卸载一个依赖 pip uninstall some-package六、虚拟环境与全局环境的关系运行于虚拟环境里的时候, 其与全局环境彼此之间是相互独立的状态, 这也就表明了, 在虚拟环境当中所安装的库对全局环境不会产生影响, 反过来讲也是如此, 即全局环境里的情况不会关联到虚拟环境。要是你存在使用全局环境里的库的需求, 那么你能够运用下面这样的命令:# 列出全局环境中的库 pip list --path/path/to/global/site-packages # 在虚拟环境中安装全局环境中的库 pip install --global-option--install-option--prefix/path/to/virtual/env /path/to/global/site-packages/some-package.whl七、总结这里详细阐述了虚拟环境也就是 venv 的建造以及运用法子, 我们先是知晓了虚拟环境的基础概念以及特性, 后续接着学习了怎样去创建、激活以及运用虚拟环境我们还明白了怎样于虚拟环境里开展安装以及管理依赖, 还有虚拟环境与整体环境之间的关联。一个重要工具, 乃是虚拟环境, 它非常有利于提高项目独立性, 还能够用于避免版本冲突。要是掌握了虚拟环境相关, 也就是其创建方面与使用的技能, 那便可以助力我们去编写这样的项目, 这种项目具备更显著的可靠性, 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