def push_identity(self, identifiers):
if (not identifiers):<EOL><INDENT>msg = ("<STR_LIT>"<EOL>"<STR_LIT>")<EOL>raise ValueError(msg)<EOL><DEDENT>stack = self.get_run_as_identifiers_stack()<EOL>if (not stack):<EOL><INDENT>stack = []<EOL><DEDENT>stack.append(identifiers)<EOL>session = self.get_session()<EOL>session.set_internal_attribute(self.run_as_identifiers_session_key, stack)<EOL>
:type identifiers: subject_abcs.IdentifierCollection