sys.platform is now always 'linux2' on Linux (even on Linux 3)

merge from 3.2. Fix closes Issue11155  - Correct the multiprocessing.Queue.put's arg (replace 'item' with 'obj') in the docs. Patch by Westley Martínez.

Fix closes Issue11155  - Correct the multiprocessing.Queue.put's arg (replace 'item' with 'obj') in the docs. Patch by Westley Martínez.

tarfile unnecessarily checked the existence of numerical user and group ids on
extraction. If one of them did not exist the respective id of the current user
(i.e. root) was used for the file and ownership information was lost. (Patch
by Sebastien Luttringer)

#12888: Fix a bug in HTMLParser.unescape that prevented it to escape more than 128 entities.  Patch by Peter Otten.

sdist used to crash with a full traceback dump instead of printing a
nice warning with the faulty line number.

Structure field is not a string.

a string.