A Guide to Python's Magic Methods (2012)
> Be careful, however, as there is no guarantee that __del__ will be executed if the object is still alive when the interpreter exits, so __del__ can't serve as a replacement for good coding practices (like always closing a connection when you're done with it.<p>When the interpreter exits, your program's resources should be reclaimed by the operating system, right? So why not just use __del__?