Get a list (without nested list) directly from a list comprehension

Try this with just zip to get it in that order that you want:

[i for j in zip(alist1_temp, alist2_temp) for i in j]

if you don't mind the order just do:

alist1_temp + alist2_temp

or get it with itertools.chain thanks to @buran:

import itertools

list(itertools.chain(alist1_temp, alist2_temp))