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Consider this repro:
draft @ cat zip-tb.txt>>> import zipfile>>> import io>>> zf = zipfile.ZipFile(io.BytesIO(), 'w')>>> zf.foo # doctest: +ELLIPSISTraceback (most recent call last):...AttributeError: ... draft @ py -3.12 -m doctest zip-tb.txtException ignored in: <function ZipFile.__del__ at 0x100f36b60>Traceback (most recent call last): File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/zipfile/__init__.py", line 1916, in __del__ self.close() File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/zipfile/__init__.py", line 1933, in close self.fp.seek(self.start_dir)ValueError: I/O operation on closed file.The test runs fine, but triggers aValueErroratexit.
The issue only arises if the last expression in the doctest triggered a traceback and the zipfile was present in the traceback. Changingzf.foo toio.foo or adding>>> pass bypasses the error.
I suspect there's a flaw in doctest that leaves resources unclosed if the last expression is handling a traceback.
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