Re: [xml] Python 3.5 issue - SystemError: <built-in function xmlReadFile> returned a result with an error set

[Stefan Behnel <stefan_ml behnel de>]

Petr Sumbera schrieb am 30.08.2017 um 14:00:
> anyone seen following error when running Python regression tests? This is
> just with Python 3.5. Pythons 2.7 and 3.4 are ok (I haven't tested Python
> 3.6).
>
> ## running Python regression tests
> TypeError: 'NoneType' object is not callable
>
> During handling of the above exception, another exception occurred:
>
> Traceback (most recent call last):
>   File
> "/builds/psumbera/userland-libxml2-2.9.5/components/libxml2/libxml2-2.9.5/python/tests/tstLastError.py",
> line 80, in <module>
>     test.test1()
>   File
> "/builds/psumbera/userland-libxml2-2.9.5/components/libxml2/libxml2-2.9.5/python/tests/tstLastError.py",
> line 62, in test1
>     line=0)
>   File
> "/builds/psumbera/userland-libxml2-2.9.5/components/libxml2/libxml2-2.9.5/python/tests/tstLastError.py",
> line 30, in failUnlessXmlError
>     f(*args)
>   File
> "/builds/psumbera/userland-libxml2-2.9.5/components/libxml2/libxml2-2.9.5/python/libxml2.py",
> line 1374, in readFile
>     ret = libxml2mod.xmlReadFile(filename, encoding, options)
> SystemError: <built-in function xmlReadFile> returned a result with an
> error set
> -- tstLastError.py

What this error means is that a Python exception was raised and not
handled, and when returning from the Python function call to the
C-implemented function, it returned an actual result value instead of
returning NULL in order to propagate the exception. This is a bug in the C
extension. It should either silence and clear the exception explicitly with
PyErr_Clear(), or propagate it.

Stefan