Patch by Jacek Kołodziej.

Patch by Jacek Kołodziej.

Patch by Jacek Kołodziej.

Patch by Kai Groner.

According to the documentation, they must be decorated as classmethods.

According to the documentation, they must be decorated as classmethods.

Original patch by Saimadhav Heblikar.

for single-byte argument on Linux.

for single-byte argument on Linux.

Patch written by Martin Panter. I replace tearDown() with addCleanup().

with a single entry point, named exit points at the bottom, more self-evident
refcount adjustments, and a comment describing why the pre-increment was
necessary at all.

explicitly forbidden as well as numeric group references.

explicitly forbidden as well as numeric group references.