Patch by Julia Lawall.

Patch by Julia Lawall.

Patch by Atsuo Ishimoto.

Close #15387: inspect.getmodulename() now uses a new importlib.machinery.all_suffixes() API rather than the deprecated inspect.getmoduleinfo()

Used os.path.join before which has different semantics on Windows.

Used os.path.join before which has different semantics on Windows.

Optimize tostringlist by taking the stream class outside the function. It's now 2x faster on short calls. Related to #1767933

ISsue #14988: restore Python 2's behavior of raising ImportError when unable to load pyexpat, instead of a SystemError/RuntimeError

Based on a patch by Nick Coghlan.

Based on a patch by Nick Coghlan.

Issue #15230: Attempt to make the OS X buildbots happy by resolving the tmp dir symlink in the test suite

The asserts were useless (and buggy).

The asserts were useless (and buggy).

Preserve the invariant tostring(elem) == b''.join(tostringlist(elem)) and add a test to make sure it keeps working

select.poll before running.  works both ways (finally).  this should
fix the windows build.

select.poll before running.  works both ways (finally).  this should fix
the windows build.

platforms that don't have it.

platforms that don't have it.