Question

I am using the following code to build a list of lists:

res = []
for i in I:
   res.append(x)
   res.append(y[i])

so my final list is [x, y[0], x, y[1],...] where x and y[i] are also lists.

Is there a way building this list using list comprehensions, instead of for loop?

Answer 1

I … think … this might be close to what you want:

res = [z for z in ((x, y[i]) for i in I)]