8,9],[10,11,12]])In[37]:np.concatenate([arr1,arr2],axis=0)Out[37]:array([[1,2,3],[4,5,6],[7,8,9],[10,11,12]])In[38]:np.concatenate([arr1,arr2],axis=1)Out[38]:array([[1,2,3,7,8,9],[4,5,6,10,11,12]])...