Simple dict of {'name': 'John Doe', 'email': 'name@example.com'}

def add_signer(self, signer):
        """ Simple dict of {'name': 'John Doe', 'email': 'name@example.com'}"""
        if isinstance(signer, HelloSigner) and signer.validate():
            self.signers.append(signer)
        else:
            if not signer.validate():
                raise Exception("HelloSigner Errors %s" % (signer.errors,))
            else:
                raise Exception("add_signer signer must be an instance of class HelloSigner")