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pip install -U中的“ -U”选项代表什么

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问题：pip install -U中的“ -U”选项代表什么
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问题：pip install -U中的“ -U”选项代表什么

尽管有大量Google搜索，但我找不到pip命令行选项/参数的任何文档。什么pip install -U意思 是否有人链接到pip选项和参数列表？

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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?

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键入pip install -h列出帮助：

-U，–upgrade将所有软件包升级到最新可用版本

因此，如果您已经安装了软件包，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。

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，并pip [subcommand] -h为该子命令提供帮助，例如install。

您也可以在线找到完整的参考文档。“ 常规选项”部分涵盖了每个pip子命令可用的开关，而每个子命令都有一个单独的“ 选项”部分来涵盖特定于子命令的开关；例如，请参阅“ pip install选项”部分。

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Type pip install -h to list help:

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

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.

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.

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.