parameters: (self)
docstring: This is an abstract class.
docstring_summary: This is an abstract class.
docstring_tokens: This is an abstract class .
function: def __init__(self):
          """This is an abstract class."""
          # Don't call this from a concrete subclass!
          if self.__class__ is BaseSet:
              raise TypeError, ("BaseSet is an abstract class.  "
                                "Use Set or ImmutableSet.")
function_tokens: def __init__ ( self ) : # Don't call this from a concrete subclass! if self . __class__ is BaseSet : raise TypeError , ( "BaseSet is an abstract class.  " "Use Set or ImmutableSet." )