How to use the ptype.container function in ptype

def clone(cls, **newattrs):
    '''
    Will clone a class, and set its attributes to **newattrs
    Intended to aid with single-line coding.
    '''
    class __clone(cls): pass
    for k,v in newattrs.items():
        setattr(__clone, k, v)

    # FIXME: figure out why some object names are inconsistent
#    __clone.__name__ = 'clone(%s.%s)'% (cls.__module__, cls.__name__)   # perhaps display newattrs all formatted pretty too?
    __clone.__name__ = '%s.%s'% (cls.__module__, cls.__name__)   # perhaps display newattrs all formatted pretty too?
#    __clone.__name__ = cls.__name__
    return __clone

class __union_generic(ptype.container):
    __fastindex = dict  # our on-demand index lookup for .value

    def getindex(self, name):
        try:
            return self.__fastindex[name]
        except TypeError:
            self.__fastindex = {}
        except KeyError:
            pass

        res = self.keys()
        for i in range( len(res) ):
            if name == res[i]:
                self.__fastindex[name] = i
                return i