Python code coverage for Lib/test/crashers/mutation_inside_cyclegc.py

#	count	content
1	n/a
2	n/a	# The cycle GC collector can be executed when any GC-tracked object is
3	n/a	# allocated, e.g. during a call to PyList_New(), PyDict_New(), ...
4	n/a	# Moreover, it can invoke arbitrary Python code via a weakref callback.
5	n/a	# This means that there are many places in the source where an arbitrary
6	n/a	# mutation could unexpectedly occur.
7	n/a
8	n/a	# The example below shows list_slice() not expecting the call to
9	n/a	# PyList_New to mutate the input list. (Of course there are many
10	n/a	# more examples like this one.)
11	n/a
12	n/a
13	n/a	import weakref
14	n/a
15	n/a	class A(object):
16	n/a	pass
17	n/a
18	n/a	def callback(x):
19	n/a	del lst[:]
20	n/a
21	n/a
22	n/a	keepalive = []
23	n/a
24	n/a	for i in range(100):
25	n/a	lst = [str(i)]
26	n/a	a = A()
27	n/a	a.cycle = a
28	n/a	keepalive.append(weakref.ref(a, callback))
29	n/a	del a
30	n/a	while lst:
31	n/a	keepalive.append(lst[:])