strange output from GC

[Joe Wong]

Hi, I am running some test script with garbage collector. Here is my test script:

import gc
gc.set_debug(gc.DEBUG_LEAK)

class bb:
    def __init__(self):
        self.i = 1123
        self.functable = [{123:self.printit}]

    def printit(self):
        print self.i

try:
    b = bb()
except:
    pass

b=bb()    # comment this out in 2nd test

print gc.collect()
print gc.garbage

It prints the following:

gc: collectable <dict 0083A540>
gc: collectable <bb instance at 0083B2D8>
gc: collectable <dict 0083A150>
gc: collectable <instancemethod 007E6EE0>
gc: collectable <list 00833810>
5
[{'i': 1123, 'functable': [{123: <bound method bb.printit of <__main__.bb instan
ce at 0x0083B2D8>>}]}, <__main__.bb instance at 0x0083B2D8>, {123: <bound method
 bb.printit of <__main__.bb instance at 0x0083B2D8>>}, <bound method bb.printit
of <__main__.bb instance at 0x0083B2D8>>, [{123: <bound method bb.printit of <__
main__.bb instance at 0x0083B2D8>>}]]

Then, I comment out the line as stated in the script, I get:

0
[]

this time.

I done another test with the modified script:

import gc
gc.set_debug(gc.DEBUG_LEAK)

class bb:
    def __init__(self):
        self.i = 1123
        self.functable = [{123:self.printit}]

    def printit(self):
        print self.i


b=bb()
del b

print gc.collect()
print gc.garbage

When I run, I got:

gc: collectable <dict 0083A540>
gc: collectable <bb instance at 0083B300>
gc: collectable <dict 0083A150>
gc: collectable <instancemethod 007E6EE0>
gc: collectable <list 00833810>
5
[{'i': 1123, 'functable': [{123: <bound method bb.printit of <__main__.bb instan
ce at 0x0083B300>>}]}, <__main__.bb instance at 0x0083B300>, {123: <bound method
 bb.printit of <__main__.bb instance at 0x0083B300>>}, <bound method bb.printit
of <__main__.bb instance at 0x0083B300>>, [{123: <bound method bb.printit of <__
main__.bb instance at 0x0083B300>>}]]

If I remove the "del b" line from script, it outputs

0
[]

I don't know what is the problem with my script here. Are these the expected result from the garbage collector?


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