As a user of SageCell I don't care whether it runs on Python 2 or 3 but I 
DO care about it's BACKWARDS COMPATIBILITY. Backwards compatibility is (at 
least for me) a cornerstone of trust in sustainability. When I give out a 
worksheet for others to use it leaves my control but it takes some of my 
reputation with it - which breaks if the worksheet stops working for 
whatever reason. In fact, changing the format of the print statement broke 
many of my worksheets.

Ultimately, I don't care whether backwards compatibility is achieved 
through a pre-processor or through a fallback installation.

Having said this, I hasten to emphasise my highest appreciation for  
theSageCell developers and maintainers. In my context I wouldn't have any 
other system to replace SageCell.


Am Freitag, 14. Februar 2020 00:13:53 UTC+1 schrieb Andrey Novoseltsev:
>
> On Thursday, 13 February 2020 15:47:30 UTC-7, Ingo Dahn wrote:
>>
>> Here is another problem:
>> SageCells using R not too seldom have 'NULL' in its output, apparently 
>> when some R command has no output (that was the interpretation of a 
>> colleague of mine from Erlangen University who is using SageCell with R for 
>> teaching.)
>>
>
> This has been the case for a year now:
> https://trac.sagemath.org/ticket/27025
>
> Would it perhaps be possible that SageCell falls back to a Python 2 
>> version instead of producing Python-3-related errors?
>>
>
> What do you mean? Keep using Python 2 longer and then switch at some 
> point? What would be different at that point?
>  
>
>> Can you recommend a set of online tutorials and manuals where the 
>> examples have been checked for compatibility with Python 3 SageCell?
>>
>
> There is nothing specific to Python 3 in SageCell - you are supposed to 
> get the same results as when using Sage 9.0 locally or via CoCalc. If you 
> don't - that's a bug that should be fixed.
>

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