在迭代中连接 numpy arrays

Question

Within a for loop, I am extracting a Numpy array of size 10x256 . I would like to concatenate all those arrays (the iteration in total are 20) and create an array of size of 200x256 . I managed to do that by using a for loop within the for loop:

my_list= []
for i in range(0,20):
   my_arr = process() # 10x256
   for item in my_arr:
       my_list.append(item)

How can I do the same thing without using the second for loop?

Answer 1

With single numpy.concatenate routine:

new_arr = np.concatenate([process() for i in range(20)])