用另一个反向扩展列表的最有效方法是什么？

Question

I have one list that I want to take a slice of, reverse that slice and append each of those items onto the end of another list. The following are the options I have thought of (although if you have others please share), which of these is the most pythonic?

# Option 1
tmp = color[-bits:]
tmp.reverse()
my_list.extend(tmp)

# Option 2
my_list.extend(list(reversed(color[-bits:])))

# Option 3
my_list.extend((color[-bits:])[::-1])

Answer 1

I like

my_list.extend(reversed(color[-bits:]))

It explains what you are doing ( extending a list by reverse of another list's slice) and is short too.

and a obligatory itertools solution

my_list.extend( itertools.islice( reversed(color), 0, bits))

Answer 2

my_list.extend(color[:-(bits + 1):-1])

Answer 3

For Option #2, you can cut out the call to list . You could also use += instead of extend , like so:

my_list += reversed(color[-bits:])