def __isub__ ( self , other ) : self . _binary_sanity_check ( other ) set . difference_update ( self , other ) return self
python set subtract another set
Remove all elements of another set from this RangeSet .
def __isub__(self, other):
        """Remove all elements of another set from this RangeSet."""
        self._binary_sanity_check(other)
        set.difference_update(self, other)
        return self