i have been trying to work with BRATS dataset like this one Brain Tumor Segmentation | Kaggle but when i try to load it in 3d slicer then type this command in the python interpretor it tells me that the array only contains 0
The BraTS data is skull stripped, so the entire background is zeros. When you print a numpy array you only see the start and end of the arrays, so probably all you are seeing is background. You can use other numpy operations, like nnn.mean() or nnn.max() to confirm there are values.