I have a better way to solve exercise 89

I think

print(np.sort(Z)[-n:])

or

Z.sort()
print(Z[-n:])

would be better than

https://github.com/rougier/numpy-100/blob/916e1ecf9544719b49ece6fc135b089988b33058/100_Numpy_exercises_with_hints_with_solutions.md#L1084

because the first solution is simpler, and if it's ok to modify the array in place, the second solution is faster and uses less space.