code: def _getmember(self, name, tarinfo=None, normalize=False):
          
          # Ensure that all members have been loaded.
          members = self.getmembers()
  
          # Limit the member search list up to tarinfo.
          if tarinfo is not None:
              members = members[:members.index(tarinfo)]
  
          if normalize:
              name = os.path.normpath(name)
  
          for member in reversed(members):
              if normalize:
                  member_name = os.path.normpath(member.name)
              else:
                  member_name = member.name
  
              if name == member_name:
                  return member
docs: Find an archive member by name from bottom to top.
             If tarinfo is given, it is used as the starting point.