Python

temp_list = [[], [], [], []]
temp_list[0].append("a1")
temp_list[1].append("a2")
temp_list[2].append("a3")
temp_list[3].append("a4")

a = np.array([[1,2,3]])

l = [4,5,6]

np.vstack([a,l])
Out: array([[1, 2, 3],
       		[4, 5, 6]])

arr = []
arr.append([])
arr[0].append('aa1')
arr[0].append('aa2')

n,m=int(input()),int(input())
   for i in range(0,n):
      for j in range(0,m):
         a[i].append(int(input()))

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