Patch by Hallvard B Furuseth.

Found by Franz Glasner in #2504.

contents cannot be read.

(Backport to 2.7 of existing 3.x fix)

an unreadable directory.

new test cases for importing bad packages and unreadable packages dirs.

would be finalized after the reference to its underlying BufferedRWPair's
writer got cleared by the GC.

- Using the file role with {placeholders} is IMO clearer than fake
Python code.

- The fact that sys.version[:3] gives '2.7' is a CPython detail and
should not be advertised (see #9442), even if some stdlib modules
currently rely on that detail.

(except in the strop module, which is deprecated anyway)

Reported and diagnosed by Thomas Kluyver.

metaclass is registered with copyreg.  Patch by Nicolas M. Thiéry and
Craig Citro.

Patch by Dan Kenigsberg.

Issue #13034: When decoding some SSL certificates, the subjectAltName extension could be unreported.

Jarosch.

Thanks to Suman Saha for finding the bug and providing a patch.

than a Python module (e.g. "__init__.py"): don't close the file twice.

PyFile_FromFile() does also close the file if PyString_FromString() failed. It
did already close the file on fill_file_fields() error (e.g. if the file is a
directory).

failing with a UnicodeDecodeError.

ready before having been set up.

multiprocessing.reduction, which may not be available (e.g. if the OS doesn't
support FD passing over Unix domain sockets).

Issue #12973: Fix int.__pow__ overflow checks that invoked undefined behaviour, thereby producing incorrect results on Clang.