import timeit
from itertools import ifilter, imap, izip, islice

lst = ["fffdks","fffkdj","fffkdk","fffkdl","fffkjj","fffkjk","fffkjl","fgskdf"]

def _filter(s):
    for i in xrange(len(s)-1):
        if s[i] == s[i + 1]: return False
    return True

def _filter2(s):
    for i in xrange(1, len(s)):
        if s[i - 1] == s[i]: return False
    return True

def _filter3(s):
    for a, b in izip(s, islice(s, 1, None)):
        if a == b: return False
    return True

if "__main__" == __name__:
    t1 = timeit.Timer("filter(_filter, lst)",
            "from __main__ import _filter, lst, izip, islice")
    t2 = timeit.Timer("filter(_filter2, lst)",
            "from __main__ import _filter2, lst, izip, islice")
    t3 = timeit.Timer("filter(_filter3, lst)",
            "from __main__ import _filter3, lst, izip, islice")
    print(t1.timeit(100000))
    print(t2.timeit(100000))
    print(t3.timeit(100000))

# к выше приведенному коду добавил функцию
def test():
    filter(_filter, lst)
    filter(_filter2, lst)
    filter(_filter3, lst)
# после строки print(t3.timeit(100000)) добавил
cProfile.run("test()", "test.prof")