docs: def gzip(self, data, truncate=True):
          '''
          Performs an entropy analysis based on zlib compression ratio.
          This is faster than the shannon entropy analysis, but not as accurate.
          '''
          # Entropy is a simple ratio of: <zlib compressed size> / <original
          # size>
          e = float(float(len(zlib.compress(str2bytes(data), 9))) / float(len(data)))
  
          if truncate and e > 1.0:
              e = 1.0
  
          return e