"-U"代表什么? pip install -U中的选项代表 [英] What does the "-U" option stand for in pip install -U

问题描述

尽管有很多Google搜索，但我找不到pip命令行选项/参数的任何文档. pip install -U是什么意思?没有人有指向pip选项和参数列表的链接吗?

Despite a ton of Googling, I can't find any docs for pip's command line options/arguments. What does pip install -U mean? Does anyone have a link to a list of pip's options and arguments?

推荐答案

键入pip install -h列出帮助:

-U，--upgrade将所有软件包升级到最新的可用版本

-U, --upgrade Upgrade all packages to the newest available version

因此，如果您已经已安装软件包，它将为您升级该软件包.如果没有-U开关，它将告诉您该软件包已安装并退出.

So, if you already have a package installed, it will upgrade the package for you. Without the -U switch it'll tell you the package is already installed and exit.

每个pip子命令都有其自己的帮助列表. pip -h向您显示总体帮助，而pip [subcommand] -h为该子命令(例如install)提供帮助.

Each pip subcommand has its own help listing. pip -h shows you overall help, and pip [subcommand] -h gives you help for that sub command, such as install.

您还可以在线找到完整的参考文档； 常规选项部分涵盖每个pip子命令可用的开关，而每个子命令都有单独的 Options 部分，以涵盖特定于子命令的开关；请参见 pip install选项部分 ，例如.

You can also find the full reference documentation online; the General Options section covers switches available for every pip subcommand, while each subcommand has a separate Options section to cover subcommand-specific switches; see the pip install options section, for example.

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