如何在python3中创建列表列表？

Question

So, currently I've created 2 empty list , with length 128 and 64, added numbers into them (just to test it out) and now I'm trying to insert the DirectoryEntries list into the AvailableBlocks list . But when I print the new list out, it just prints None . Is there a way to do this while keeping DirectoryEntries a list ?

AvailableBlocks = list() * 128
DirectoryEntries = list() * 64
AvailableBlocks.append(1)
AvailableBlocks.append(2)
print(AvailableBlocks)
DirectoryEntries.append(123)
DirectoryEntries.append(456)
print(DirectoryEntries)
print(AvailableBlocks.insert(0, DirectoryEntries))

Answer 1

The insert does not return a value. Try

AvailableBlocks.insert(0, DirectoryEntries)
print(AvailableBlocks)

and it should work