Build and returns the property's *fdel* method for the member defined by *name*.

def _fset(self, name):
        """
        Build and returns the property's *fdel* method for the member defined by *name*.
        """
        def fset(inst, value):
            # the setter uses the wrapped function as well
            # to allow for value checks
            value = self.fparse(inst, value)
            setattr(inst, name, value)
        return fset