UserDict and UserList issue (bug?_

[Norman Shelley]

in UserDict and UserList there is one or more places where a call to
self's __class__() method is made, e.g.

def __getslice__(self, i, j):
  i = max(i, 0); j = max(j, 0)
  # This class and its subclasses need more arguments then 0
  userlist = self.__class__()
  ....


This blows causes major problems when either of these two classes are
subclassed and the class which subclasses them requires creation
arguments.  I think maybe a copy of self instead of a __class__() may be
a more robust solution.