def realLengthEncode(string): current = string[0] count = 1 toReturn = '' for char in string[1:]: if char == current: count += 1 else: toReturn += str(count)+current current = char count = 1 toReturn += str(count) + current return toReturn def realLengthDecode(string): index = 0 toReturn = '' while index < len(string): count = int(string[index]) letter = string[index+1] for i in range(count): toReturn += letter index += 2 return toReturn decoded = 'aaaabcccaa' encoded = realLengthEncode(decoded) print encoded decoded2 = realLengthDecode(encoded) print decoded == decoded2
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