How to check what is holding reference to object

[Christian Heimes]

Almar Klein wrote:
> Ah, it does exist! I wish I knew that two months ago, it would've saved me
> some precious time ;)

The trick works only for objects that are tracked by CPython's garbage 
collector. Simple and non-containerish objects like str, int, unicode 
and some other types aren't tracked by the gc. IIRC all types written in 
Python are gc-aware.

Christian