Take the content of a list and append it to another list

Question

I am trying to understand if it makes sense to take the content of a list and append it to another list.

I have the first list created through a loop function, that

Answer 1

Take a look at itertools.chain for a fast way to treat many small lists as a single big list (or at least as a single big iterable) without copying the smaller lists:

>>> import itertools
>>> p = ['a', 'b', 'c']
>>> q = ['d', 'e', 'f']
>>> r = ['g', 'h', 'i']
>>> for x in itertools.chain(p, q, r):
        print x.upper()