How to give object away to python garbage collection?

Question

There are several threads on Python garbage collection in SO, and after reading about five, plus some doc on line, i am still not sure as to how garbage collection works and

Answer 1

Maybe this also can help:

>>> # Create a simple object with a verbose __del__ to track gc.
>>> class C:
...     def __del__(self):
...         print "delete object"
... 
>>> c = C()
>>> # Delete the object c successfully.
>>> del c
delete object
>>> # Deletion of an object when it go out of the scope where it was defined.
>>> def f():
...     c = C()
...
>>> f()
delete object
>>> c = C()
>>> # Create another reference of the object.
>>> b = c
>>> # The object wasn't destructed the call of del only decremented the object reference. 
>>> del c
>>> # Now the reference counter of the object reach 0 so the __del__ was called. 
>>> del b
delete object
>>> # Create now a list that hold all the objects.
>>> l = [C(), C()]
>>> del l
delete object
delete object
>>> # Create an object that have a cyclic reference.
>>> class C:
...     def __init__(self):
...         self.x = self
...     def __del__(self):
...         print "delete object"
... 
>>> c = C()
>>> # Run the garbage collector to collect object.
>>> gc.collect()
9
>>> # the gc.garbage contain object that the gc found unreachable and could not be freed.  
>>> gc.garbage
[<__main__.C instance at 0x7ff588d84368>]
>>> # Break the cyclic reference.
>>> c.x = None
>>> # And now we can collect this object.
>>> del c
delete object
>>> # Create another object with cyclic reference.
>>> c = C()
>>> # When closing the interactive python interpreter the object will be collected.
delete object

Refrences : del method ; gc module ; weakref module