[Tim Peters]
Or my personal favorite,
while mylist: del mylist[::2]
Then the original index positions with the most consecutive trailing 1 bits survive the longest, which is important to avoid ZODB cache bugs <wink>.
[Christos Georgiou]
This is a joke, hopefully, and in that case, I fell for it. If not, please provide a url with related discussion (for educational purposes :)
Fell for what? It's certainly true that the code snippet allows the original index positions with the most consecutive trailing 1 bits to survive the longest (on the first iteration, all even index positions (no trailing 1 bits) are deleted, and you don't really need a URL to figure out what happens on the i'th iteration). The idea that this is helpful in avoiding anything's "cache bugs" is purely <wink>-worthy, though.