df.loc[(df!=0).any(axis=1)]
np.delete(matrix, np.where(~matrix.any(axis=1))[0], axis=1)
users[users!=0]
users[users > 0]
users[users > 0]
users[users!=0]
users[users!=0]
users[users!=0]
users[users!=0]
users[users > 0]
users[users!=0]
users[users > 0]