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#!/usr/bin/python
import urwid
from weakref import ref
b = urwid.Button("test one")
def hold_b_ref(x):
print "hello", b
urwid.connect_signal(b, 'click', hold_b_ref)
r = ref(b)
assert r()
del b
# circular reference is detected and removed:
assert not r()
class Foo(object):
def __init__(self):
self.btn = urwid.Button("test two")
urwid.connect_signal(self.btn, 'click', self.say_hi)
def say_hi(self, btn):
print "hi"
f = Foo()
r = ref(f.btn)
assert r()
f.btn = None
# circular reference is detected and removed:
assert not r()
b = urwid.Button("test one")
def hold_b_ref(x):
print "hello", b
urwid.connect_signal(b, 'click', hold_b_ref)
r = ref(b)
assert r()
del hold_b_ref
del b
# circular reference detected and removed:
assert not r()
f = Foo()
r = ref(f)
assert r()
import gc
gc.collect()
f = None
# circular reference only removed after gc.collect()
assert r()
assert gc.collect()
assert not r()
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