code: def electrum_pub(self, s):
          
          blob = self._electrum_to_blob(s)
          if blob and len(blob) == 64:
              return self._network.keys.electrum_public(master_public_key=blob)
docs: Parse an electrum public key from a text string in seed form ("E:xxx" where xxx
          is a 128-character hex string).
          Return a :class:`ElectrumWallet <pycoin.key.electrum.ElectrumWallet>` or None.