cek dupe

cek_string.py

from collections import Counter
def cek(string):
    if len(string) >= 2:
        dupe = 0
        for i in Counter(string).most_common():
            if i[1] >= 2: dupe += 1
        if dupe >= 2: return True
    return False
    
print cek('aaabbcdeg')
print cek('aaaaaaaaab')
print cek('absjedeo')
print cek('aaaabbbbbccccdd')