为什么`conda update --all`不全部更新? [英] Why does `conda update --all` not update all?

问题描述

类似于此问题，但是那里没有答案.

Similar to this question, but there's no answer there.

我先安装了anaconda，然后又安装了conda install -c conda-forge geopandas.当我运行import geopandas时，我得到了

I installed anaconda, and then conda install -c conda-forge geopandas. When I ran import geopandas, I got

>>> import geopandas as gpd
anaconda3/envs/gis/lib/python3.7/importlib/_bootstrap.py:219: 
RuntimeWarning: numpy.dtype size changed, may indicate binary 
incompatibility. Expected 96, got 88 
return f(*args, **kwds)

因此，我尝试更新像conda update --all这样的Anaconda env的所有软件包，但这并不能解决警告.解决方案 的解决方案是更新特定程序包:conda update numpy.

So, I tried updating all packages of my Anaconda env like conda update --all, but that didn't solve the warnings. What did solve it was updating the specific package: conda update numpy.

所以，我的问题是:conda update --all是做什么的，它不会更新所有软件包?

So, my question is: what does conda update --all do, that it doesn't update all packages?

推荐答案

conda update文档指出:

此命令接受软件包名称列表，并将其更新为与环境中所有其他软件包兼容的最新版本 ." -强调我的

"This command accepts a list of package names and updates them to the latest versions that are compatible with all other packages in the environment." -- emphasis mine

这意味着conda update将不会更新某些软件包，如果更新可能会使其他软件包的稳定性受到威胁.因此，conda update -all可能会优先考虑稳定性而不是最近的版本.鉴于conda update numpy正在优先考虑numpy更新，而对整体稳定性的要求却很小/根本没有考虑.

This means that conda update will not update some packages if updating may put the stability of other packages at risk. As such, conda update -all is likely prioritizing stability over more recent builds. Whereas, conda update numpy is prioritizing the numpy update with minimal/no regard to overall stability.

作为一个旁注，我以前曾破坏了软件包安装的稳定性，因为其他安装正是这样做的-将单个软件包更新为最新版本.

As a side note, I have previously broken package stability for other installs doing exactly that -- updating a single package to its most recent version.

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