Class ListSet

UserList.UserList --+
                    |
                   ListSet

Known Subclasses:

tree.TreeNodeSet

Class to represent Sets of objects stored in a list. There is an
implicit order amongst the objects and there can be duplicate objects.

__getattr__, __setattr__ and __delattr__ have been modified to operate on
the list of objects rather than the TreeNodeSet itself, i.e. if atm is an
instance of a ListSet a.xxx will not return the member xxx of the object
atm but rather a list of the members xxx from each object in the set atm.
xxx can be a member of a function that requires no argument.

Example:

  if atm is an instance of a ListSet:
  atm.name            return the name attribute of each Atom in atm
  atm.newprop = 7.2   creates a newprop attribute for each Atom in atm
                      with an initial value of 7.2
  atm.newIndex = range(len(atm)) create a newIndex attribute for each Atom
                      in atm with values 0 for the first atom, 1 for the
                      second, etc...
  del atm.newIndex
  
This class also implement  boolean operations on ListSets. These operation
overload some operators.

A uniq() method returns a list with the double removed.
A makeUnique() method removes duplicates from list (in place).