code: def electrum_seed(self, s):
          
          blob = self._electrum_to_blob(s)
          if blob and len(blob) == 16:
              blob = b2h(blob)
              return self._network.keys.electrum_seed(seed=blob)
docs: Parse an electrum key from a text string in seed form ("E:xxx" where xxx
          is a 32-character hex string).
          Return a :class:`ElectrumWallet <pycoin.key.electrum.ElectrumWallet>` or None.