def wout_prop(self, *args):
pp = self._properties<EOL>for a in args: pp = pp.discard(a)<EOL>return self if pp is self._properties else self.copy(_properties=pp)<EOL>
obj.wout_property(...) yields a duplicate of the given object with the given properties
  removed from it. The properties may be specified as a sequence of column names or lists of
  column names.