#!/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()
Ejemplo n.º 4
0
#!/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()