(Pdb) self.mtool
<MembershipTool at /utilities//portal_membership>
(Pdb) self.mtool.getAuthenticatedMember()
<PloneUser 'joet'>
(Pdb) self.mtool.getAuthenticatedMember().getId()
'joet'
(Pdb) self.mtool.getMemberById('joet') is None
True