#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
import gc
from pprint import pprint
import weakref
from weakref_graph import Graph, demo
class WeakGraph(Graph):
def set_next(self, other):
if other is not None:
# Verificare se si debba sostituire il riferimento ad
# other con una weakref.
if self in other.all_nodes():
other = weakref.proxy(other)
super(WeakGraph, self).set_next(other)
return
demo(WeakGraph)
#!/usr/bin/env python
# encoding: utf-8
#
# Copyright (c) 2008 Doug Hellmann All rights reserved.
#
"""Tools for demonstrating garbage collection
"""
#end_pymotw_header
import gc
from pprint import pprint
import weakref
from weakref_graph import Graph, demo
class WeakGraph(Graph):
def set_next(self, other):
if other is not None:
# See if we should replace the reference
# to other with a weakref.
if self in other.all_nodes():
other = weakref.proxy(other)
super(WeakGraph, self).set_next(other)
return
demo(WeakGraph)
#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""Using proxy to prevent cycles.
"""
import gc
from pprint import pprint
import weakref
from weakref_graph import Graph, demo, collect_and_show_garbage
gc.set_debug(gc.DEBUG_LEAK)
print 'Setting up the cycle'
print
demo(Graph)
print
print 'Breaking the cycle and cleaning up garbage'
print
gc.garbage[0].set_next(None)
while gc.garbage:
del gc.garbage[0]
print
collect_and_show_garbage()
#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""Using proxy to prevent cycles.
"""
import gc
from pprint import pprint
import weakref
from weakref_graph import Graph, demo, collect_and_show_garbage
gc.set_debug(gc.DEBUG_LEAK)
print 'Setting up the cycle'
print
demo(Graph)
print
print 'Breaking the cycle and cleaning up garbage'
print
gc.garbage[0].set_next(None)
while gc.garbage:
del gc.garbage[0]
print
collect_and_show_garbage()
