Original patch by Martin Panter.

instead of deperecated cgi.escape().  Original patch by Raymond Hettinger.

Patch by Alex Gaynor.

Patch written by Martin Richard.

current directory in current directory.

bytes path.

7159 instead of obsoleted RFC 4627.

collections module now accept the self keyword argument.

Suggested by James Lowden on docs@.

objects in the SubprocessStreamProtocol. It allows to pause the transport to
not buffer too much stdout or stderr data.

Patch by Charles-Axel Dein.

Patch by Donald Stufft.

Issue #22894: TestCase.subTest() would cause the test suite to be stopped when in failfast mode, even in the absence of failures.

It can still be enabled by instantiating a SSLContext manually.

the parent close() method. If the event loop is already closed, the self-pipe
is not unregistered from the selector.

functions:

* add_signal_handler()
* call_at()
* call_later()
* call_soon()
* call_soon_threadsafe()
* run_in_executor()

Fix also the error message of add_signal_handler() (fix the name of the
function).