>>882
普通にappendでいけるだろ
a=[]
b=[]
b.append([1,2,3,4,5])
b.append([2,3,4,5,6])
a.append(b)
b=[]
b.append([3,4,5,6,7])
b.append([4,5,6,7,8])
b.append([5,6,7,8,9])
a.append(b)
print(a[0])
[[1, 2, 3, 4, 5], [2, 3, 4, 5, 6]]
print(a[1])
[[3, 4, 5, 6, 7], [4, 5, 6, 7, 8], [5, 6, 7, 8, 9]]