如何在 pip 需求文件中指定可选依赖项?
How can I specify optional dependencies in a pip requirements file?
根据 pip 文档，这是可能的，但文档没有解释如何这样做，我在网上找不到任何例子.
According to the pip documentation this is possible, but the documentation doesn't explain how to do it, and I can't find any examples on the web.
你可以创建一个optional-requirements.txt和一个<代码>requirements.txt.
Instead of specifying optional dependencies in the same file as the hard requirements, you can create a optional-requirements.txt and a requirements.txt.
要将当前环境的包导出到文本文件中，您可以这样做:
To export your current environment's packages into a text file, you can do this:
pip freeze > requirements.txt
如有必要，修改 requirements.txt 的内容以准确表示您项目的依赖项.然后，要安装此文件中的所有包，请运行:
If necessary, modify the contents of the requirements.txt to accurately represent your project's dependencies. Then, to install all the packages in this file, run:
pip install -U -r requirements.txt
-U 告诉 pip 将包升级到最新版本，-r 告诉它安装 requirements.txt 中的所有包.
-U tells pip to upgrade packages to the latest version, and -r tells it to install all packages in requirements.txt.
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