How to find and split a string by repeated characters?

Question

I am trying to split a string into a list, separated by a change in character, in python. I am finding this very difficult, but am sure that I am over thinking it and missi

Answer 1

import itertools
[''.join(value) for key, value in itertools.groupby(my_str)]

Answer 2

>>> import re
>>> my_str = 'abgg22ffeekkkk1zzabbb'
>>> [m.group() for m in re.finditer(r'(.)\1*', my_str)]
['a', 'b', 'gg', '22', 'ff', 'ee', 'kkkk', '1', 'zz', 'a', 'bbb']