Спасибо за подсказку для старичка!

from sympy import symbols

from sympy.solvers.diophantine import diop_DN

I solve this kata using module sympy

I import from the module sympy, and the test program swears and prescribed import sympy does not help

ModuleNotFoundError: No module named 'sympy'

Give some advice please

I also agree with the user eliseuvideira who sent this message:

The description is very confusing for anyone that is not native speaker,
please make it clear what I need to do to complete this kata.

If possible, show the code how to generate an array (or a hint where you can find it!) From tuples with such values D = 3 N = 3 and so that the sum is 81 as in Kata's task ---- super_sum (3, 3), 81)
Even in the example for Kath’s decision, it’s not clear how the list was created. If D = 2 and N = 3 the answer is 18 which would be the sum of every number in the following:

[
[(0,0), (0,1), (0,2)],
[(1,0), (1,1), (1,2)],
[(2.0), (2.1), (2.2)]
]

But it seemed to me that if I correctly translated the words of the assignment,
there would be no need to rewrite anything, but just flip the arrays in place
and change the pointers a, b = b, a

Maybe I'm not understanding something.