strings in error report.

Also slight code reorg for PEP 8 guidelines.

Issue #18978: Update docs to reflect explicitly the ability to set the attribute at the class level.

- be clear finalizers survive automatically
- update for PEP 442 __del__ changes
- mention module cleanup changes and weakref.finalize in What's New

Since all versions since 2.2 are under the same licensing terms,
this saves the release manager from touching the two files for
very new minor release.

(should fix the failures on OpenIndiana)

returned empty string.

returned empty string.

binaries.

Best I can tell, the possible values for this aren't documented anywhere.

Merge from 3.3
Addresses Issue #18553: isatty is not Unix only.

Addresses Issue #18553: isatty is not Unix only.

Since we have fine grained import locks in 3.4, I moved the
import to where it is actually needed.

This avoids race conditions when other programs are monitoring
the maildir directory.  Patch by janzert.