def add_to_public_members(self, public_member):
assert isinstance(public_member, github.NamedUser.NamedUser), public_member<EOL>headers, data = self._requester.requestJsonAndCheck(<EOL>"<STR_LIT>",<EOL>self.url + "<STR_LIT>" + public_member._identity<EOL>)<EOL>
:calls: `PUT /orgs/:org/public_members/:user <http://developer.github.com/v3/orgs/members>`_
:param public_member: :class:`github.NamedUser.NamedUser`
:rtype: None