import sys
 
 def public(f):
   """Use a decorator to avoid retyping function/class names.
 
   * Based on an idea by Duncan Booth:
   http://groups.google.com/group/comp.lang.python/msg/11cbb03e09611b8a
   * Improved via a suggestion by Dave Angel:
   http://groups.google.com/group/comp.lang.python/msg/3d400fb22d8a42e1
   """
   all = sys.modules[f.__module__].__dict__.setdefault('__all__', [])
   if f.__name__ not in all:  # Prevent duplicates if run from an IDE.
       all.append(f.__name__)
   return f
 
 public(public)  # Emulate decorating ourself