Gustavo J. A. M. Carneiro added the comment:
I have narrowed it down to one line of code:
ctypes.create_string_buffer(16)
That is enough to create 7 objects that have reference cycles.
[<class 'ctypes.c_char_Array_16'>, {'__module__': 'ctypes', '__doc__': None,
'__weakref__': <attribute '__weakref__' of 'c_char_Array_16' objects>, 'raw':
<attribute 'raw' of 'c_char_Array_16' objects>, '_length_': 16, '_type_':
<class 'ctypes.c_char'>, 'value': <attribute 'value' of 'c_char_Array_16'
objects>, '__dict__': <attribute '__dict__' of 'c_char_Array_16' objects>},
(<class 'ctypes.c_char_Array_16'>, <class '_ctypes.Array'>, <class
'_ctypes._CData'>, <class 'object'>), <attribute '__weakref__' of
'c_char_Array_16' objects>, <attribute 'raw' of 'c_char_Array_16' objects>,
<attribute 'value' of 'c_char_Array_16' objects>, <attribute '__dict__' of
'c_char_Array_16' objects>]
So maybe the bug is in ctypes itself, not the uuid module.
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<http://bugs.python.org/issue20519>
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