Python: filtering lists by indices

Question

In Python I have a list of elements aList and a list of indices myIndices. Is there any way I can retrieve all at once those items in aList

Answer 1

I wasn't happy with these solutions, so I created a Flexlist class that simply extends the list class, and allows for flexible indexing by integer, slice or index-list:

class Flexlist(list):
    def __getitem__(self, keys):
        if isinstance(keys, (int, slice)): return list.__getitem__(self, keys)
        return [self[k] for k in keys]

Then, for your example, you could use it with:

aList = Flexlist(['a', 'b', 'c', 'd', 'e', 'f', 'g'])
myIndices = [0, 3, 4]
vals = aList[myIndices]

print(vals)  # ['a', 'd', 'e']