code: def getmember(self, name):
          
          tarinfo = self._getmember(name)
          if tarinfo is None:
              raise KeyError("filename %r not found" % name)
          return tarinfo
docs: Return a TarInfo object for member `name'. If `name' can not be
             found in the archive, KeyError is raised. If a member occurs more
             than once in the archive, its last occurrence is assumed to be the
             most up-to-date version.