I'm seeing the same thing.  I'm not loading Python modules, but just trying 
to access image and data files stored on github.  Here is an example for me:

Example 7.6.2 
https://ula-ds.netlify.app/sec-svd-uses#example-96


On Thursday, October 12, 2023 at 2:25:43 PM UTC-4 david.a...@gmail.com 
wrote:

> For a long time, I have served Sage cells that load python modules hosted 
> in a github repository.  Today they stopped working with an error:  
>
> URLError: <urlopen error [Errno -3] Temporary failure in name resolution>
>
> Here's an example:  
> https://understandinglinearalgebra.org/sec-gram-schmidt.html#activity-80
>
> Is there anything I can do or is it really a temporary problem that will 
> be resolved soon?
>
> Thanks,
> David
>

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