/usr/lib/python3.7/test/dtracedata/instance.py is in libpython3.7-testsuite 3.7.0~b3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | import gc
class old_style_class():
pass
class new_style_class(object):
pass
a = old_style_class()
del a
gc.collect()
b = new_style_class()
del b
gc.collect()
a = old_style_class()
del old_style_class
gc.collect()
b = new_style_class()
del new_style_class
gc.collect()
del a
gc.collect()
del b
gc.collect()
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