On Thu, Nov 20, 2014 at 10:54 PM, Gill Shen <gillar...@gmail.com> wrote: > How is this behavior implemented under the hood? And why is this allowed at > all? Is it just a curiosity or can you do something useful with it?
Reference cycles are common in Python and other OO languages. For example, adding a widget to a window; the window contains references to its child widgets, and it's probably useful for the widgets to know what their parents are, so they would hold references back. A list containing itself is similarly a reference cycle. I don't know off-hand of any use for this specific case, but it's just a slightly tighter cycle than normal. -- https://mail.python.org/mailman/listinfo/python-list
