Getting a sublist of a Python list, with the given indices?

Question

I have a Python list, say a = [0,1,2,3,4,5,6]. I also have a list of indices, say b = [0,2,4,5]. How can I get the list of elements of a

Answer 1

Yet another alternative for better performance if that is important to you- it is by no means the most Pythonic but I am pretty sure it is the most efficient:

>>> list(filter(lambda x: a.index(x) in b, a))
[0, 2, 4, 5]

Note: You do not need to convert to a list in Python 2. However you do in Python 3 onwards (if any future visitors may have a similar issue).