Removing elements that have consecutive duplicates

Question

I was curios about the question: Eliminate consecutive duplicates of list elements, and how it should be implemented in Python.

What I came up with is this:

Answer 1

Another possible one-liner, using functools.reduce (excluding the import) - with the downside that string and list require slightly different implementations:

>>> from functools import reduce

>>> reduce(lambda a, b: a if a[-1:] == [b] else a + [b], [1,1,2,3,4,4,5,1,2], [])
[1, 2, 3, 4, 5, 1, 2]

>>> reduce(lambda a, b: a if a[-1:] == b else a+b, 'aa  bbb cc')
'a b c'