Remove consecutive duplicates in a NumPy array

Question

I would like to remove duplicates which follow each other, but not duplicates along the whole array. Also, I want to keep the ordering unchanged.

So if the input is

Answer 1

For pure python wich also works with numpy arrays use this:

def modify(l):
    last = None
    for e in l:
        if e != last:
            yield e

        last = e

pure = modify([0, 0, 1, 3, 2, 2, 3, 3])

import numpy
num = numpy.array(modify(numpy.array([0, 0, 1, 3, 2, 2, 3, 3])))

I don't know if there are any numpy functions wich would speed this up.