return Unicode strings on Python 3.

after changes to issue22118 were submitted.

Patch contributed by Demian Brecht and reviewed by Antoine Pitrou.

module.

module.

Issue #21332: Ensure that ``bufsize=1`` in subprocess.Popen() selects line buffering, rather than block buffering.

Issue #21332: Ensure that ``bufsize=1`` in subprocess.Popen() selects line buffering, rather than block buffering.

AttributeError when sys.stderr is None.

AttributeError when sys.stderr is None.

Since EmailMessage is a provisional API we can fix API bugs in a
maintenance release, but I used a trick suggested by Serhiy to
maintain backward compatibility with 3.4.0/1.

use patch context manager instead of decorator because the decorator 'leaks' metadata onto the function

python.org OS X installers are now distributed as signed installer
packages compatible with the Gatekeeper security feature.