"./sage -pip install cython" installs cython for python3: Requirement 
already satisfied: cython in ./local/lib/python3.7/site-packages (0.29.14); 
and
"Requirement already satisfied: gmpy2 in 
./local/lib/python3.7/site-packages (2.0.8)"

So I think that, may be, cython need gmpy2 installed in other way? I still 
have na error:

[sagelib-8.9] cimport gmpy2
[sagelib-8.9]        ^
[sagelib-8.9] ------------------------------------------------------------
[sagelib-8.9] 
[sagelib-8.9] sage/rings/complex_double.pyx:110:8: 'gmpy2.pxd' not found




воскресенье, 3 ноября 2019 г., 23:52:01 UTC+3 пользователь Simon King 
написал:
>
> Hi Dima, 
>
> On 2019-11-02, Dima Pasechnik <dim...@gmail.com <javascript:>> wrote: 
> > There "python" is Sage's Python, "pip" manages its modules, etc. 
>
> IIRC, that's not true for Sage's py-3 version. Namely, if one opens a 
> sage-with-py-3 shell, then "python" still means "python2". So, if you 
> really want Sage-with-py-3's Python installation, you should either do 
> "sage -python" or (in a Sage shell) "python3". And I think the same 
> holds for pip. 
>
> Best regards, 
> Simon 
>
>

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