Weak refrences to an object can be collected if no strong refrences remain, but we can disable it!
Lists and dictionaries cannot be weak refrenced, but this can:
class Dict(dict):
pass
class List(list):
pass
If your holding a large dictionary, you might want to split up over diffrent variables, like this:
import weakref,gc
gc.disable() #no garbage collection!
d = weakref.WeakValueDictionary() #if your values are large(otherwise use WeakKeyDictionary)
#do what ever#
Want group things held together (no order) that also have regular value names?(Deleted when no strong refrences)
Just use weakref.WeakSet!
