set and dict iteration

[Thomas Rachel]

Am 19.08.2012 00:14 schrieb MRAB:

>> Can someone who is more familiar with the cycle detector and cycle
>> breaker, help prove or disprove the above?
>>
> In simple terms, when you create an immutable object it can contain
> only references to pre-existing objects, but in order to create a cycle
> you need to make an object refer to another which is created later, so
> it's not possible to create a cycle out of immutable objects.

Yes, but if I add a list in-between, I can create a refcycle:

a = []
b = (a,)
a.append(b)

So b is a tuple consisting of one list which in turn contains b.

It is not a direct cycle, but an indirect one.

Or would that be detected via the list?


Thomas