当“解决环境"问题时，conda会做什么? [英] What does conda do when "solving environment"

问题描述

每当我运行conda install/remove/update <package>时，它都会告诉我它是解决环境"一段时间，然后才告诉我要下载/安装/更新的内容列表.大概是在寻找<package>的依赖项，但是为什么有时执行此操作后有时删除包呢?例如，当我尝试安装Mayavi时，它决定需要删除Anaconda Navigator.

Whenever I run conda install/remove/update <package>, it tells me it's "Solving environment" for some time before telling me the list of things it's going to download/install/update. Presumably it's looking for dependencies for <package>, but why does it sometimes remove packages after doing this operation? For example, as I was trying to install Mayavi, it decided it needed to remove Anaconda Navigator.

此外，它不提供仅执行建议操作的子集的选项.有没有一种方法可以指定我不希望删除软件包?

Furthermore it does not provide an option to perform only a subset of the suggested operations. Is there a way to specify that I don't want a package removed?

推荐答案

您可以在conda命令中添加--debug选项，并查看控制台(或终端)的输出.例如，键入conda update --debug numpy. 从输出中，我们可以看到客户端从频道列表中请求repodata.json并在Solving Environment步骤中本地进行一些计算.

You can add --debug option to the conda command and see the output from console(or terminal). For example, type conda update --debug numpy. From the output, we can see that the client requests repodata.json from channel list and do some computation locally in the Solving Environment Step.

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