It seems like an info message rather than error and the command proceeds. 
Do you want the message to be gone, or you actually need some colors?

As for using print etc, did it use to behave differently? When?

SageMathCell does not do any special handling for Cython - your command is 
fed into Jupyter kernel for Python, which then processes the magic command. 
So at the moment I think that things work as expected, but if something 
else is highly desired, we may try to work on it.

Andrey

On Monday, 21 March 2022 at 08:23:27 UTC-6 kcrisman wrote:

> Hi all,
>
> I got an interesting and new (to me) error today.
>
> "INFO: Disabling color, you really want to install colorlog. "
>
> See https://sagecell.sagemath.org/?q=lrgkbk
>
> I couldn't even get the result here without using "print()", so maybe 
> something has changed in Sage/Sage cell regarding Cython usage, so my 
> apologies if this is user error.  But thought it should be reported, at 
> least, since I couldn't find that error in a search of the sage-cell Google 
> group.
>
> - kcrisman
>

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