Python conda在“解决环境”时做了什么
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What does conda do when "solving environment"
提问by dkv
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 removepackages after doing this operation? For example, as I was trying to install Mayavi, it decided it needed to remove Anaconda Navigator.
每当我运行时conda install/remove/update <package>，它都会告诉我它是“解决环境”一段时间，然后告诉我它将要下载/安装/更新的内容列表。大概它正在寻找 的依赖项<package>，但为什么它有时会在执行此操作后删除包？例如，当我尝试安装 Mayavi 时，它决定需要删除 Anaconda Navigator。
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?
此外，它不提供仅执行建议操作的子集的选项。有没有办法指定我不想删除包？
回答by zhaofeng-shu33
You can add --debugoption 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.jsonfrom channel list and do some computation locally in the Solving EnvironmentStep.
您可以--debug向 conda 命令添加选项并查看控制台（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repodata.json从通道列表中请求并在Solving EnvironmentStep本地进行一些计算。
回答by Katyjean57
As a side note on the "Solving Environment" step...
Lack of administrator privileges may affect whether or where you can install python packages.
作为“解决环境”步骤的旁注......
缺乏管理员权限可能会影响您是否或在哪里可以安装 python 包。
I observed that my installs would hang on the "Solving Environment" step and never get through when attempting to install packages while logged in as a non-administrator.
我观察到我的安装会挂在“解决环境”步骤上，并且在以非管理员身份登录时尝试安装软件包时永远不会通过。
Getting switched to admin was possible for me on the machine I was stuck on, so I just did that and it solved the problem.
在我卡住的机器上切换到管理员是可能的，所以我只是这样做并解决了问题。
Commenter explains workaround when this is not possible.
当这不可能时，评论者解释了解决方法。
回答by Venkat Govindan
conda install --prune <<package>>helped me to install the right channel.
conda install --prune <<package>>帮我安装了正确的频道。
Suspecting environment used are for zipline and channel used not compatible with existing one. prune takes a lot of time but helped me in solving the environment issues.
使用的可疑环境是用于与现有的不兼容的滑索和通道。prune 需要很多时间，但帮助我解决了环境问题。
