code: def from_address(cls, address):
          
          public_key = is_valid_address(address)
          verifying_key = ed25519.VerifyingKey(public_key)
          return cls(verifying_key)
docs: Generate a :class:`Keypair` object via a strkey encoded public key.
  
          :param str address: A base32 encoded public key encoded as described in
              :func:`encode_check`
          :return: A new :class:`Keypair` with only a verifying (public) key.