# run length compression algorithm def compress_s(s): if len(s) == 0: return None final_arr = [] index = 0 letter = s[0] for el in s: if el == letter and ord(el) == ord(letter): index += 1 else: final_arr.append(letter + repr(index)) letter = el index = 1 final_arr.append(letter + repr(index)) return "".join(final_arr) print(compress_s("AAAaaa")) #or -- similar solution with a while loop def compress2(s): r = "" l = len(s) #edge cases if l == 0: return "" if l == 1: return s + "1" count = 1 i = 1 while i < l: if s[i] == s[i-1]: count += 1 else: r = r + s[i-1] + str(count) count = 1 i += 1 r = r + s[i -1] + str(count) return r
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