Remove __ from the end of _name_ if it starts with __classname__
        return the "unmangled" name.

def unmangle_code_names(self, co, classname):
        """Remove __ from the end of _name_ if it starts with __classname__
        return the "unmangled" name.
        """
        if classname:
            classname = '_' + classname.lstrip('_') + '__'

            free = [ self.unmangle_name(name, classname)
                     for name in (co.co_cellvars + co.co_freevars) ]
            names = [ self.unmangle_name(name, classname)
                      for name in co.co_names ]
            varnames = [ self.unmangle_name(name, classname)
                         for name in co.co_varnames ]
        else:
            free = co.co_cellvars + co.co_freevars
            names = co.co_names
            varnames = co.co_varnames
        return free, names, varnames