It shows that list comprehension has a single loop variable across all loop iterations that gets reassigned on each iteration, while the sequence comprehension creates a new loop variable bound to current item on every iteration.
If you instead fully evaluate the generator expression before calling any of the functions (for example, by passing it to the list constructor), you get the same behavior as the list comprehension case:
>>> [f() for f in list(lambda: i for i in range(0, 10))]
[9, 9, 9, 9, 9, 9, 9, 9, 9, 9]Side note: I think that commenters above didn't quite understand what I meant by "leaking", because there's more than one scope boundary here. Roughly speaking, any comprehension or loop can be desugared into something that looks like a C-style for-loop:
/* scope 1 */
for (/* scope 2 */) {
/* scope 3 */
}