code: def sec(self, s):
          
          pair = parse_colon_prefix(s)
          if pair is not None and pair[0] == self._wif_prefix:
              s = pair[1]
          try:
              sec = h2b(s)
              return self._network.keys.public(sec)
          except Exception:
              pass
docs: Parse a public pair as a text SEC.
          Return a :class:`Key <pycoin.key.Key>` or None.