python - pip安装中的方括号是什么意思？

Question

我看到越来越多的命令是这样的:

$ pip install "splinter[django]"

这些方括号有什么作用？

Answer 1

您使用的语法是:

pip install "project[extra]"

在您的情况下，您是 installing，是 splinter软件包，该软件包具有对 django的新增支持。方括号( [])不是特定的语法，只是约定。确实，您正在安装名为 "splinter[django]"的软件包。
@chetner的解释:

The command pip install splinter django would install two packages named splinter and django. splinter[django], on the other hand, installs a variant of the splinter package which contains support for django. Note that it has nothing to do with the django package itself, but is just a string defined by the splinter package for a particular feature set that gets enabled.