code: def hash160(self, is_compressed=None):
          
          if is_compressed is None:
              is_compressed = self.is_compressed()
          if is_compressed:
              if self._hash160_compressed is None:
                  self._hash160_compressed = hash160(self.sec(is_compressed=is_compressed))
              return self._hash160_compressed
  
          if self._hash160_uncompressed is None:
              self._hash160_uncompressed = hash160(self.sec(is_compressed=is_compressed))
          return self._hash160_uncompressed
docs: Return the hash160 representation of this key, if available.