How to find contiguous substrings from a string in python

You can use itertools.groupby() for this:

from itertools import groupby

s = 'abccdddcce'
l1 = ["".join(g) for k, g in groupby(s)]
l2 = [a[:i+1] for a in l1 for i in range(len(a))]
print l2

Output:

['a', 'b', 'c', 'cc', 'd', 'dd', 'ddd', 'c', 'cc', 'e']