numpy 数组增加列，增加行的函数：column_stack,row_stack，删除行或列的函数，delete

def fun_ndarray():
      a = [[1,2,7],
           [-6,-2,-3],
           [-4,-8,-55]
           ]
      b = [3,5,6]
      a = np.array(a)
      b = np.array(b)
      a_b_column = np.column_stack((a,b))#左右根据列拼接
      a_b_row = np.row_stack((a,b))#上下按照行拼接 
      print('a_b_column')
      print(a_b_column)
      print('a_b_row')
      print(a_b_row)

data = np.delete(data,3,axis=1) # 删除第四列