28.02.18 16:14, Kirill Balunov пише:
2018-02-28 16:49 GMT+03:00 Serhiy Storchaka <firstname.lastname@example.org mailto:email@example.com>: Other options:
stuff = [[y, y] for y in (f(x) for x in range(5))]
Why not `stuff = [[y, y] for y in map(f, range(5))]`? It is currently the fastest and most readable version IMHO.
Only in this particular case. This doesn't work if the expression for items depends on x or if the subexpression is not a function call.