In [3]: a = np.arange(20.).reshape(4,5) ...: c_module.not_inc_array(a, 1.1) ...: print(a) from not_inc_array dimensions: 2, type: 12 [[ 0. 1. 2. 3. 4.] [ 5. 6. 7. 8. 9.] [10. 11. 12. 13. 14.] [15. 16. 17. 18. 19.]]