[wiml]

That appears to be the size of the list itself, not including the objects it contains: 8 bytes per entry for the object pointer, and a kilo-to-kibi conversion. All Python values are "boxed", which is probably a more important thing for a Python programmer to know than most of these numbers.

The list of floats is larger, despite also being simply an array of 1000 8-byte pointers. I assume that it's because the int array is constructed from a range(), which has a __len__(), and therefore the list is allocated to exactly the required size; but the float array is constructed from a generator expression and is presumably dynamically grown as the generator runs and has a bit of free space at the end.

[lopuhin]

That's impressive how you figured out the reason for the difference in list of floats vs list of ints container size, framed as an interview question that would have been quite difficult I think

[mikeckennedy]

It was. I updated the results to include the contained elements. I also updated the float list creation to match the int list creation.